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Drill pipe, drill collar, casing tubing, and line pipe are our specialty. We supply quality drill pipes, standard heavy weight drill pipes, spiral heavy drill pipes, slick drill collars, spiral drill collars, non-magnetic drill collars, seamless oil casing, ERW oil casing, and oil and gas tubing at very competitive prices. All of our oilfield drill pipe, drill collar, casing and tubing, and line pipe meet the industry standards established by the American Petroleum Institute (API). As a global supplier of quality oilfield equipment to the oil and gas industry, we ship our products around the world. Besides the drill pipes, drill collars, oil casing and tubing, and line pipes, we supply drilling rigs, work-over rigs, top drives, drilling equipment, triplex mud pumps, blowout preventers, BOP control systems, solids control equipment, etc. 

Drill Pipe and Heavy Weight Drill Pipe Our drill pipes are in accordance with API Spec 5D and our heavy weight drill pipes are in accordance with API Spec 7-1. We supply full API size range of drill pipe and heavy weight drill pipes from 2-3/8 to 6-5/8 inches. Our heavy weight drill pipes include integral heavy weight drill pipes and welded heavy weight drill pipes. The steel grades of our drill pipes include E75, X95, G105 and S135. In addition, we can add hard-banding and internal coating by request. We also sell various tool joints and drill stem accessories including pup joints, lift subs, crossover subs, and reamers etc. 

Drill Collar and Non-Magnetic Drill CollarDrill collars are made with material AISI 4145H in accordance with API Spec 7-1. We supply slick drill collars and spiral drill collars; their sizes are from 3-1/8 to 11 inches. 

Casing and TubingOur oilfield casing and tubing are in accordance with API Spec 5CT. Casing is used for oil and gas well drilling, and tubing is used for extracting oil and gas from reservoirs. Our oil casing includes seamless casing and ERW casing.

Line Pipe Line pipes are used to transport oil and gas, water, mineral slurry and other fluids. Our line pipes are manufactured in accordance with API Spec 5L. We supply various line pipes including SSAW, LSAW, ERW and seamless line pipes.

Quality Pipes at Competitive Prices Our headquarters are located in the energy capital London, UK. We ship our products around the world. One important thing about us is that our prices are very competitive and our delivery time is short.

Mild carbon steel pipe Mild carbon steel pipe is one of boiler pipes used in the power plant boiler pipe. Most of these tubes work under high temperature and pressure, therefore, there is certain requirements on the mechanical properties of mild carbon steel pipe, welding performance and organizational performance, in addition to required to have good room temperature and high temperature mechanical properties, these tubes need a lot of cold processing, therefore, the requirements of these tubes must have high ductility and toughness. Cold processing program is essential for boiler pipe installation process, but in the cold bending process, work hardening will also be of marrow. Cold-formed general, there are two ways, one is not cold-formed before preheating a cold boast preheating. Preheated usually torches baking, preheat temperature empirically by the operator to grasp, and after both cold bending, and no heat treatment process. Therefore, the cold processing escape often bring changes of mechanical properties and changes in the performance of organizations, which formed a potential light pipe in the service process insurance to become one of the reasons of the failure. Is well known, cold bending after the hardening causes the strength of the steel tube and the increase in hardness, ductility and toughness decreased, the reason is broken crystal and near the lattice strong torsional SUI copper slip plane, increasing the slip resistance so continue to slip difficult to carry out. Moreover, with the increase of the degree of deformation, work hardening process hair gold increased.For mild carbon steel pipe, cold processing (including cold-formed before the warm-up) will have a huge impact on steel pipe organization, will directly lead to serious fracture failure. Therefore, the organization must be cold-formed carbon steel pipe processing countermeasures for small.

Developing a reasonable warm-up According to the of different steels reply and recrystallization temperature, to work out the correct preheat temperature and operating procedures, and not blindly heating, not to exceed Ac] phase transition point, the warm-up can prevent collapse corner cracking or the formation of micro-cracks. However, the data indicate that the low-carbon steel in the 300. C about when there will be the "blue brittle"instead to plastic toughness decreases. Accordingly, in order to more smoothly to the deformation step, the preheating temperature at 400 ~ 500. C of smell is more appropriate. At the same time, pay attention to shoes, towel, too cold bending deformation speed; too fast. Improve the speed of summer-shaped, the higher the temperature of the "Blue marrow".

Heating treatment after net bend Recrystallization annealing, and the elimination of the mechanical properties due to the work hardening of the changes according to different specifications and working conditions of the workpiece must be carried out on the workpiece after cold working. 640 is used for the steel pipe for the 20# annealing, can be a good stress relief and the recovery of the mechanical properties. But it is to be noted that, in the subsequent cooling process, it is necessary to slow cooling, - like cooling rate can not be more than 6 to 8. C / rain.In a short, mild carbon steel pipe in the cold bending process (including warm-up), a significant impact on organizational performance be steel pipe, a direct result of serious fracture failure. Preheat the cold-formed carbon steel pipe should be strictly in accordance with the process execution, after the cold-formed must avoid line annealing heat treatment.

UV paint for steel pipe UV paint is the abbreviation of Ultraviolet Curing Paint, UV-curable paint, also called photo initiated coating, light-curable coatings. Named to the film-forming material with PU, PE, NC paint different the UV lacquer paint curing named. Automatically by machinery and equipment roller coating, curtain coating to the surface of the plate of furniture, prompted initiator decomposition under the irradiation of UV light (wavelength 320-390nm) to produce free radicals caused by the resin reaction, instant film curing.Another interpretation of the UV-curable coatings (ultraviolet curing coating) referred to UV lacquer, PU, PE, NC lacquer film forming materials named in different ways, UV lacquer paint curing named, it is a UV rapidly within a few seconds (ultraviolet, UV) irradiation curing the coating of the film formation.UV paint is used widely lacquer furniture, main features: After strong ultraviolet light curing, color stability, lasting for years, effectively resolve the door fade and color difference; door mirror flat screen is better, and the film full no orange peel; paint door, one of the more environmentally friendly world health; door other paint door hardness, scratch plan, acid, not easily deformed.

UV paint quality timber information UV paint curing speed, ultraviolet radiation, within a fraction of a second to reach the surface is dry. When the coating film by a wet film becomes dry film, the shrinkage rate is large, the internal stress is relatively large, and thus poor adhesion between coats. UV paint hardness generally stronger than other paints, usually coating the harder, more brittle, less wear-resistant coating is also easy to crack. When the hardness of the coating exceeds demand, with the change of the thermal expansion and contraction of the floor or the shrinkage of the swelling, changes in the surface coating due to the lack of flexibility can not trace over the floor deformation and deformation, and cracks. Therefore, in finishing when necessary to strictly control the quality of the paint, so as to safeguard the overall quality of the wood.

Difference between UOE and JCOE pipe Large-caliber, high delivery pressure, long transport distances and multiple types of transport medium is the main symbol of the pipeline industry technological progress, but also the general trend of the pipeline industry development. With the development of China's oil industry, the gas line, second-line, and other large-scale projects ongoing, large diameter, wall thickness of the high-pressure pipeline, greatly improving demand. The traditional spiral seam welded pipe has been unable to meet the requirements in terms of capacity and safety performance, large diameter, wall thickness, high grade LSAW pipes to replace the spiral welded pipe has become an inevitable trend. LSAW pipe reliable quality, has been widely used in foreign countries for the oil and gas of the high-voltage transmission trunk line. In recent years, the country will also gradually formed LSAW pipe production capability, mainstream pipe UOE technology and JCOE of technology. With the improvement of the steel grade, pipeline construction, straight seam submerged arc welded pipe to become the first choice of most of the main trunk line, especially in the harsh natural environment, the densely populated marine pipeline. "West-East Gas Pipeline Project, for two, three, four types of large caliber straight seam submerged arc welded pipe, 14% is made JCOE tube, and the rest is imported UOE pipe. 

UOE production process Material on a steel plate converter → refining → continuous casting → slab → welding arc board → Milling → pre → U molding → O high-pressure water forming → dry → presoldering → welding → outer welding flange removal cited arc board → weld and pipe → pipe end expanded diameter of the end of the ultrasonic flaw detection → X-ray inspection → Pipe → tube end welds polished flathead → hydrostatic test → weld pipe end X-ray examination of the ultrasonic testing of the weld and pipe end end of stratification and magnetic particle inspection → remanence demagnetization → the factory inspection → weighing → chamfer → tube guard ring length measurement → spray mark → stacked shipping 

JCOE production process Material re-→ vacuum hanging → board probe → flap → planing curl before demi plate (J molding) on the board edge → loose → enter demi steel plate (C molding) demi steel plate → curl → loose out → bend → pre-welded → welding cited the (quenching) arc board → welding → Qing root Weld → mechanical repair end to cited hydrostatic test (put out) arc the board → ultrasonic inspection → mechanical expanding → tube end of the ultrasonic inspection ring → X-ray inspection → Magnetic particle inspection of the finished product inspection → weighing and measuring the length of the UT stratification test → outside anticorrosion → inner corrosion → mark → delivery 
Production of UOE and JCOE, different product differentiation 
The view from the two production processes, both in the process of forming the front and rear is basically the same, the biggest difference is that the molding way. The UOE forming mainly consists of two steps: the U forming and O molding. And JCOE forming part of the program is divided into six parts, production efficiency is greatly reduced. Forming different way, leading to the the UOE and JCOE differences in diameter, wall thickness, dimensions, production efficiency, yield ratio. 

The UOE line pipe and JCOE of pipeline pipe from the comparative analysis of the production process and production cost, the following conclusions: 
(1) UOE production efficiency, capacity, and replacement of the mold longer period, more suitable for the production 
(1) UOE production efficiency, capacity, and the replacement of mold longer period, more suitable for the production of large quantities, the product of a single specification; production less efficient JCOE, a mold corresponding to a variety of specifications, more suitable for the production of small volume, multi-specification products. 
(2) the UOE produce products diameter range and thickness range should be less than JCOE, but fully able to meet the requirements of the project. 
(3) From a performance point of view, UOE line pipe compared JCOE the have residual stress, high precision Dimensions yield advantages than small. Resistance welding steel pipe application in petrochemical industry 
Because the pipeline transportation is particularly suitable for transporting oil, gas, therefore, the pipeline in petroleum and petrochemical industry was widely used. our annual crude oil 120000000 T, most used by pipeline; annual production of steam, coal, diesel 5000 million tons, of which 80% with pipeline transport; petrochemical enterprise device, device of liquid or gaseous chemical materials transportation is mainly through the pipeline to complete. Therefore, petrochemical enterprises annual capital construction and in production and repair all need to use a large number of steel pipe. But, because of the petrochemical industry work is characterized by high temperature and high pressure, flammable and explosive, so for the use of steel tubes require very strict.

Straight resistance welding steel pipe development
In recent years, there is an international high-quality seamless steel pipe to replace the high cost development trend, mainly due to the welded pipe production technology constantly breakthrough, manifested in the following aspects:
( 1) desulfurization technology, so that the sulphur content of steel is reduced, improves the welding quality of steel pipe.
( 2) vacuum degassing technology, improve tube blank steel purity, reduces the inclusions, the weld seam quality improve.
( 3) because of the addition of V, Ti, Nb and other special elements, reduces the carbon equivalent, steel toughness, strength and other properties are improved.
( 4) the development of strip steel hot rolling technology, increased dimensional accuracy, so the pipe size deviation reduction.
( 5) the improvement of quality inspection methods, such as ultrasonic nondestructive testing, hydrostatic testing machine and other equipment should be used, to ensure the quality of the final product.

Straight resistance welding steel pipe used in petrochemical enterprise

Petrochemical enterprises selection of steel pipe due to bear a certain pressure, generally used in fluid with seamless steel pipe. Electric resistance welded pipe and fluid with seamless steel pipe contrast, has obvious economic benefits, mainly displays in: less investment; mechanization, automation degree is high; low production energy consumption (room temperature forming, and seamless steel pipe for heating or cold drawing molding ); the production cost is low, for seamless steel tube is about 2\/3; continuous production, productivity high yield and high. Longitudinal welded pipe industry in China started in the 50's, started late, the production process and technology and developed country is compared, put in very big difference. The vast majority of enterprise technology equipment failure, lack of necessary means of detection, but also to the poor quality of the short belt, narrow as raw material, caused welded pipe products with small aperture, low bearing capacity, product structure is unreasonable, welded pipe production in 80% can only be used as a low pressure fluid conveying coal water pipe, all kinds of special pipe low proportion. This kind of low welding equipment and technology level, making .

Large diameter spiral pipe blasting
 Large diameter spiral pipe blasting, because the welds suffered the normal stress and the resultant stress is relatively small, blasting mouth generally not originated in the spiral weld its security than longitudinally welded pipes.But regardless of yield pressure is still bursting pressure are lower than the straight seam welded pipe. Test marked according to research institutions in the United States, spiral welded pipe and Longitudinal course, with a level of spiral welded pipe with high impact toughness.Strength characteristics: the delineation of the submerged arc welding process, each weld shall have the arc at the arc quenching at each longitudinally welded pipes welded girth, unable to reach the premise. There may be more of welding defects at the arc extinction . Tube in the inner pressure, usually two main stress on the tube wall, i.e., the radial stress δ and axial stress δ. Followed by the increase of steel pipe diameter, the steel grade progress, the greater the trend of steady expansion of ductile fracture tip.
Hydrostatic burst strength: since the radial stress is present in the maximum stress on the large diameter spiral pipe, weld in this direction of the vertical stress to withstand the maximum load. Measurement results, spiral welded pipe fatigue strength seamless and electric resistance welded tube test data and seamless distribution and resistance tube in a unified area, while higher than the submerged arc longitudinally welded pipes. Pipelines because lose changes in the amount of actual control process, the steel pipe to accept the role of random alternating load. Low transmigration fatigue strength of the solution the steel pipe to having a significance to determine the life of the pipeline. The same work under pressure, unified diameter spiral welded pipe straight seam welded pipe wall thickness can be reduced. The pipeline development trend of large-diameter, high-strength.
Toughness and fatigue strength: the relevant comparison test and verify large diameter spiral steel pipe and Longitudinal yield pressure and burst pressure measured and theoretical values consistent deviation close.
When the large diameter spiral steel pipe weld defects corresponding parallel exists, its extended risk is also smaller because of the smaller spiral weld force. This has proved superior to plastic deformation capacity of spiral welded longitudinally welded pipes, blasting mouth is generally confined to a pitch, which is the extension of spiral welded seam rip from the strong constraint due.

Application status of China's square rectangular tube 
In recent years, as the country's investment in infrastructure around the major municipal and construction works more and more use of the steel structure in the form, and large-sized thick-walled rectangular pipe due to the beautiful appearance, reasonable force, relatively simple processing nodesetc., and thus in the airport terminals, stadiums and convention center truss structural system, and curtain wall support system as the steel components are universally applied.However, in practical applications, square and rectangular steel pipe also encountered some urgent problems. First, the domestic cold-formed steel available in the market are mostly ordinary precision small diameter, thin-walled cold-formed steel, the material is mostly Q235, while 300mm * 300mm * 12mm or more high-strength, thick-walled, large-sized rectangular steel pipe, room temperature online continuous molding difficult technology, investment, and there is a lot of risk, and thus many such components in the steel construction had to be imported from abroad, restricting the development of China's construction steel. Second, rectangular steel pipe steel members also faced with the problem of high-temperature softening, no matter in what occasions are required to be fireproof treatment, this aspect has increased the workload and the project cost, but also a certain degree of influence of the party steel tube shape beautiful visual effects.The large-sized high strength and high seismic localization of high fire-resistant the weather thick-walled cold-formed rectangular steel pipe to fill the gaps in the field of domestic building materials. So that a new type of cross-section, the steel components of the new material can be widely applied to the terminals, stadiums, convention centers and other spatial structure and truss structure system, also used in recent years, the rise of the steel structure residential system will effectively promotion of cold-formed steel structural adjustment, and promote the development of the steel building.

Epoxy coating pipe Epoxy coated steel pipes is ordinary steel after surface treatment and then made in the characteristics of the steel surface coated with epoxy resin material. This epoxy powder coated steel pipes used has excellent chemical resistance to rust corrosion, scale inside and many other issues long-term use does not appear to prevent internal blockage affecting pipeline unobstructed. Coating material high temperature modified and makes the temperature performance of the product in comparison with other similar products, a substantial increase sharply in ambient temperature does not affect the use, which greatly improve the automatic sprinkler system service life and reliability.Epoxy coated steel has the following characteristics: Corrosion resistance and long service life Epoxy coated steel has excellent chemical resistance, able to solve due to the conveyance, buried and acid, alkali, salt corrosion of the pipeline fire to substantially increase the life of the pipeline fire, the useful life of up to 50 years .
Anti-fouling, wall smooth, fluid resistance is small
Special epoxy powder epoxy-coated steel pipe surface coating with excellent anti-fouling properties, surface finish, small fluid resistance, transmission capacity.
Strong adhesion
The surface of the epoxy resin coated steel pipe, through the coating, frit, after curing,  coating firmly adhered to the surface of the tubular body, impact resistance, and does not peel.
Fire resistance
Epoxy coated steel pipe coating material for high temperature modified, can withstand a fire resistance test 15min after the test, no leakage and deformation damage.
Deviation wall thickness of seamless steel pipe 
In recent years, the proportion of seamless steel pipe in China's steel production is growing, including seamless steel pipe wall thickness deviation is the importance of the quality one of the indicators due to its wide use and the higher its quality requirements. The thickness deviation directly affect the seamless steel pipe use.
Deviation produced in the piercing mill piercing process.
Piercing machine plug with the support plunger in the perforation of the first frame centering roll formed between a cantilever structure, so that the irregular beating of the plug in the piercing process, so that the plug will be in the tube Shouli Bu resulting in the generation of the thickness deviation.
Equipment manufacturing precision and structure.
Due to the poor stability of the piercing mill rolls and the guide plate in the device manufacturing, makes the device larger perforation beating impact of tube thickness; vintage centering roll structures are generally due to the upper roller and the lower roller is not transmission, an institution the centering roll center in the actual installation and adjustment is not easy to identify the three centering roll to hold fast mandrel theoretical center of the circle, so that will be caused by the perforation top the rod by centering roll to hold fast to produce radial Shouli Bu, stability is poor, resulting in the generation of wall deviation.
Installation and adjustment of the equipment line.
Units installed in the old-fashioned perforated accustomed "under rolling" method, the so-called "under rolling" is the centerline of the center line of the punch and ejector car is not in a horizontal line, but to make the puncher centerline ejector car centerline of a few millimeters, so piercing process rolling is relatively stable, but also can reduce the perforation in cards, etc., but it would be the center line of the mandrel and the tube is not a result of the tube deviation of the wall thickness of the perforation process.
The billets of the heating process.
Billets of the heating process is very important, and if the heating billets uneven heating, and thus will produce the yin and yang side, so that the plug in the piercing process Unevenness occurred offset, resulting in the low temperature surface of the capillary wall thickness of the piercing mill, high temperature surface wall thin .
The lower of the tube material.
The level of quality of tube feeding steel pipe wall thickness deviation also have a great impact, because of the to use horse sings like shearing machine the material cutter edge quality is not high, the resulting cross-section is more serious puncher head instantly bite into the generated cross-section sliding, as well as causing eccentricity and wall thickness deviation.
Impact Tools accuracy.
Destroyed when the time of piercing billets the correct geometry of the deformation zone, i.e. the tool imprecise head oval, such as a punching machine, punching machine plug rear bore eccentric, continue to use excessive wear, uneven wear of the upper and lower guide plate and roll easily cause uneven pipe wall thickness.
Using automatic pipe rolling mill.
Automatic pipe rolling mill is a vertical mill, it will cause the wall thickness deviation in the actual production process, mainly the "ears" part is obvious.
Seen in this light, to take effective measures, seamless steel pipe wall thickness deviation can really get a lot of improvement, and then for the subsequent processes, such as hot-rolled, cold-rolled or cold drawn to provide excellent shortage tube. As a large number of non-hot-rolled pipes delivered, in the order of the processing is generally cold-rolled and cold-drawn. The cold rolling mandrel role makes steel pipe wall thickness deviation can be corrected, while cold drawn not cold drawing the core floating head is in the process of drawing state, sensory seems cold drawn steel pipe and the wall thickness deviation is reduced, substantially only the absolute value of the wall thickness is reduced, the relative deviation of the wall thickness does not much change occurs. Therefore, in order to reduce the thickness deviation of a seamless steel pipe, the best resolved in the piercing process. Because, although later in the hot rolling step, such as rolling, are rounded can also reduce the mother pipe wall thickness deviation, but the corrective effect is limited, much less on the punching machine to control well. Of course, you can also reach the the purpose of reducing the pipe wall thickness deviation in the cold rolling mill, but the use of a cold rolling mill and use than drawing machine, theory and practice has proved that only the the shortage tube wall thickness deviation control perforation stage to better solution seamless quality of the finished product and not the cost of lower productivity and improve cost.

Ssaw pipe cracks 
Speaking of spiral steel pipe fracture and crack problem, we have to refer to the relatively backward country in the above application and production of spiral steel pipe, so for spiral steel pipe fracture is relatively small. However, due to our existing buried pipeline, most are spiral steel pipe, and several large steel pipe factory in the production of spiral steel pipe. Therefore, the fracture characteristics of the spiral pipe is very necessary. The following Xiaobian do a brief study on the fracture characteristics of spiral steel.First, in the direction of cis rolling straight, that is to say, the same direction as the spiral weld, the spiral pipe fracture resistance minimum, that is in this direction, the spiral steel pipe is easy to crack. Secondly, in the vertical direction of pressing, the fracture resistance of the spiral pipe is the largest, ie, the direction of spiral steel pipe is not easy to crack in the direction. Finally, along the direction of the axis, the fracture resistance is the range between the above two directions.
2 for spiral pipe fracture direction determination, to depend on its CVN value. In the same one on tubing, if the ratio of the maximum CVN value and minimum CVN value at 2 or smaller, the helical tube pipe cracks along the axial extension; while maximum CVN value and the minimum CVN value ratio of at least 2 and close to 4 when the spiral steel pipe cracks extended along the rolling direction, and the instability of the crack will be extended along the axis; when the ratio of the maximum the CVN value and minimum CVN value of about 4 or greater when occurs the fracture, the direction of the spiral steel pipe along the rolling direction, i.e. in the direction of the spiral weld extensions. ; Once the maximum the CVN value and minimum CVN value ratio reaches 3:1 when we must consider the spiral steel pipe along the rolling direction of crack initiation.

JCOE Steel Pipe JCOE steel pipe manufacturing technology is developed a kind of welded pipe forming technology in the 1990s, the process of the molding is to first plate edge milling ( or plane ) after longitudinal edge bending, then press J→C→O sequence forming, each step stamping with three points bending theory.As is the multi-pass progressive pressing, so following problems must solve: how to determine the shape of the mold, mold and die stroke spacing, and the need how many times can guarantee the stamping the most appropriate bending radius and the best opening gross of round billet. And these problems with different steel materials, steel production plant specific mechanical properties, steel pipe specifications ( diameter and wall thickness ), which is very complex. At present, mainly by " trial and error", which replaced whenever the new standards or new steel grades, get a certain number of samples tested, working out a suitable stamping volume. Trial and error method is more reliable, but the efficiency is relatively low. Due to many technical parameters, only through trial and error method is trouble. In order to obtain a set of sophisticated technology, or even require months of trial and error process. But in the process of trial and error often uses fixed lower mold shape and spacing, only to explore punch stroke, so the results may not be optimal, without sufficient play unit capacity.So it is very necessary to study the influence factors of molding system, to establish the theory and formula, with the trial-and-error experience for molding process, thus don't need or want to test, reduce development cost and time, improving the production efficiency.High pressure boiler tube pickling and phosphating process 

High pressure boiler tube chemical degreasing
1) Chemical degreasing take the way of tank soak, in addition to the oil sump with steel production, the inner wall of the shop PVC or polyethylene.
2) Use of nitric acid of 12 to 15% (by volume) chemical degreasing treatment, a temperature of 40 ° C to 60 ° C, the time is 2 ~ 4 hours.
3) Fittings in the tank soak should be noted placed to avoid tube memory remain air.
4) Soaking process should move back and forth or flip up and down fittings, constantly changing, and in order to improve the effect of the lumen of the solution. Out of the necessary fittings, gas flushing with water after soaking
5) Chemical oil until the surface of the pipe is completely wetted by water
Hot water rinse
1) Degreasing fittings from the degreasing tank removed, immersed in 40 ℃ ~ 60 ℃ hot water tank rinsing time of 5 to 20 minutes.
2) Heat sink with a steel plate, the inner wall of the shop PVC or polyethylene.
3) The chloride ion content in water is less than 25ppm.
High pressure boiler tube flushes with water
1) Hydroplaning washed fittings flush with the pressure of water (pressure P ≥ 0.1Mpa).
2) The chloride ion content in water is less than 25ppm.
1) Passivation pool slot bubble Passivation liquid formulations and soaking time in accordance with either 2.3 table.
2) Passivity the channel steel plate production, the inner wall of the shop acid resistant plastic.
3) Immersion tank, you should pay attention to the placement position, avoid tube memory remain air.
4) Soaking process should move back and forth or flip up and down fittings, constantly changing, and in order to improve the effect of the lumen of the solution. Out of the necessary fittings, gas flushing with water after soaking.

After Passivation of the tube member, it is necessary to grasp the blown dry with clean air or nitrogen, and there must be sufficient time (at least 2 hours) to make it naturally in the air Passivation.
High pressure boiler tube inspection
Passivated after the pipe, you should perform a self-test, mutual inspection, then submit quality inspector required for acceptance.
High pressure boiler tube protection
1) If the outer surface of the paint tube member, according to the coating requirements.
2) Fittings with plastic plugs sealing, three anti-cloth bandage protection and inspection identified.

Antirust varnish for oil pipeline 
The surge in oil demand is driven by the rapid development of oil exploration, acquisition, refining, and petroleum equipment manufacturing. The production scale of China's oil pipeline has reached an annual output of 4 million tons. In order to prevent the corrosion of the steel pipe, oil pipeline production spraying or brushing a rust-proof varnish (also known as a hard anti-rust oil), storage, transport, process each year anti-rust oil demand of about 10,000 t. Usually antirust film thickness control at 20μm, and 3 to 6 months outdoor rust preventing capability. With the Chinese oil industry to overseas expansion, into the deep sea, tubing longer period of storage and transportation, the environment worse. Overseas oil companies put a higher demand anti-rust properties of the oil pipeline, pipe store 1 to 2 years, a large area of corrosion in the marine environment, the hot and humid with climate. To this end, China's steel pipe production enterprises need to be improved in the production process, technology and equipment, pipe rust ability to meet new market demands.
The basic requirements of the rust layer of oil pipeline
According to the oil pipeline production process, the long-distance transport conditions and open stacked, rust-proof varnish should have the following properties: the good performance of the construction, safety and environmental protection, fast drying; film bright, transparent, not cover the Coding identify, do not cover up the steel surface the rusty state; oil pipeline to withstand wind, sun, rain and other environmental conditions, rust-proof layer should have good weather resistance; impact, bumps and shocks during handling and transport of oil pipeline, there is destruction factor, anti-rust layer should have a good impact resistance; shipping, humid tropics job, rust-proof layer should have good resistance to heat, salt spray resistance; ambient temperature in cold winter areas and desert areas in summer, -30 ~ 60 ℃, and the rust layer should have a good temperature variability.
Oil pipeline antirust varnish
China's oil pipeline rust varnish hard anti-rust oil-modified alkyd varnish, petroleum resin varnish, modified acrylic varnish, asphalt, paint, etc., can also be used to waterborne or environmentally friendly light curing anti-rust varnish. The modified acrylic lacquer good overall performance, and account for a large share of the market. Of several major oil pipeline anticorrosive paint products suppliers are mostly modified acrylic varnish. Coating adhesion, flexibility, resistant to wear and touch, significantly higher than the hardness of the traditional anti-rust paint; rust performance, shipping to ensure that the three months does not rust; cold-resistant, heat-stable performance, minus 40 ° C frozen not crack; transparency exposure without losing light, can be clearly observed to steel pipe is coated surface rust situation; corrosion anti-soaked stable underground five years not degenerate. Modified acrylic lacquer consists of an acrylic resin, a modified resin, a corrosion inhibitor, a light stabilizer, a solvent, etc., and its basic properties are shown in Table 1. The modified acrylic varnish withstand the harsh climate and Cementing affinity test.

Quenching of steel pipes 
Quenching is heated to above the critical temperature, and incubated for a period of time, and then quickly into the quenching agent, its temperature is suddenly reduced to greater than the critical cooling rate of speed rapid cooling, but mainly to marten site not equilibrium microstructure of the heat treatment method. The quenching can increase the strength and hardness of the steel pipe, but to reduce its plasticity. Quenching in the quenching agent commonly used are: water, oil, alkaline and salts solution.45 steel after quenching, tempering, heating temperature is usually 560 ~ 600 ℃, the hardness requirement for HRC22 to 34. Quenched and comprehensive mechanical properties, so the relatively wide range of hardness. If the drawing has the hardness requirements, it is necessary to adjust the tempering temperature according to the requirements of the drawings in order to ensure the hardness. As some axle parts require high strength, high hardness requirements; some gear, the keyway shaft parts, but also because of the quenched and tempered for milling interpolation processing, lower hardness requirements. Tempering time, depending on the hardness requirements and the size of the work piece depends on the tempering temperature hardness after tempering, tempering time, but must back through, we believe that the general work piece Tempering time in total more than one hour. Seamless steel pipe

Flexible composite high pressure pipeline Flexible composite high-pressure pipelines is a polymer composite material made of a certain high-intensity, high pressure, corrosion, fouling resistance, friction coefficient and good insulation, good flexibility and long life of an oil and gas industrial pipe fittings. Flexible Composite pressure pipeline consists of an inner core tube, the enhancement layer, the outer protection layer. The raw materials for the manufacture of flexible composite high pressure pipeline: polyethylene resins, reinforcing fibers silk enhanced wire rope.
The flexible composite high-pressure pipeline is divided into methanol injection composite pipe, gas composite pipe, water composite pipe according to the uses. Diameter and uses of various types are not the same, there are also some differences nominal pressure and wall thickness.
1, in order to reduce the losses caused by corrosion, oil workers constantly screening of the pipe material present in oil production, gas production, gathering and transportation, water and other projects in the widely used steel pipe, plastic pipe, glass pipe of the steel skeleton. Hydraulic pipeline samples
2,Steel pipe - strength; corrosive leakage, short life, not uncommon malignant accident.
3, Steel skeleton plastic tube - can withstand high pressure; severe corrosion and peeling, temperature adaptability and poor air tightness.
4, Glass pipe - corrosion-resistant, anti-fouling; toughness, resistance to external squeeze the poor, easy breakage, the use of a limited range. Single tube length is limited connection frequently, poor sealing joints, failure frequency, easily damaged and difficult to repair.
5, Flexible composite high-pressure pipeline - application of the new material and technology innovation, the product has the advantage of pipe above, and corrosion-resistant, high-temperature characteristics, it will bring about revolutionary changes in the oil and gas industry.

ERW Pipe's development prospects and facing issues Resistance welding is short of ERW steel pipe with number of advantages, such as high productivity, low cost, good dimensional accuracy, beautiful appearance. However, in the past, due to the poor reliability of the weld, great limitations on the use. The proportion of small pipe production.ERW steel pipe welding mechanism made gratifying achievements, and this theory as a guide to optimize. Automatic control technology to optimize the parameters given to ensure the weld quality greatly improved; due to the improvement of ultrasonic detection technology, ultrasonic flaw detector Wong stack trace detection can be achieved in the production line; due to the improvement of the level of automation. The annealing of the weld (normalizing) treatment step in the production line. The weld performance improvement.Above several technical applications, greatly improved the reliability of ERW steel pipe welds. Making it increasingly wide range of applications. Currently, some of the world's production of ERW steel pipes pipe plant can be applied in cold areas, and many countries have been building ERW pipe production line.From countries ERW pipe production, in addition to the earlier high productivity, low into surgery, dimensional accuracy from the outside, the tensile strength of the weld. Elongation off and shrinkage, bending test at room temperature impact toughness values can meet the specification requirements. But there are a lot of manufacturers of ERW steel pipe welds poor low-temperature toughness, which limits their use in cold areas.The amount of heat input, the welding speed, the convergence angle and other factors are associated with the low temperature toughness of the weld, a large number of useful work has been done in this regard. Weld on both sides of the welding surface speed should be close to each other in the molding process, cold welding, and weld two, due to metal melt is poured to the surface separate speed, such as the former speed occurs if the latter speed is large will more foreign invasion FATT value increased, the literature recommended convergence angle of 5 to 6. Better welding speed to 20m/min specific circumstances specific analysis, I believe that after several tests to find the best welding process, thus improving the low temperature toughness of the weld.

A333-6 low temperature steel pipe welding A333-6 steel is a low-temperature steel. The minimum temperature of 70 ° C. Usually normalized or normalized and tempered state supplier.
A333-6 steel carbon content is lower, so hardened the tendency and cold cracking tendency are relatively small. Material toughness and ductility is better, generally difficult to produce hardening and cracks, good weldability, optional W707Ni electrode with El the imports of wire TGS 1N, using argon ITU welding. To ensure good toughness of welded joints.
When the ambient temperature is below 5 ° C required weldment preheating. Preheat temperature of 100-150 oC: Preheat the scope of welds on each side of 100 mm; heating oxyacetylene flame (neutral flame) temperature measuring pen measuring the temperature at 50 ~ 100 mm from the center of the weld. The measurement points uniformly distributed, in order to better control the temperature.
Chemical composition C Mn Si S P
≤0.120 0.290-1.060 ≥0.100 ≤0.058 ≤0.048

Cold drawn steel pipes pickling passivation The appearance of the cold drawn steel pipe will form a dense oxide film, to prevent the concentrated sulfuric acid or nitric acid to further react with the phenomenon called passivation. An active metal or an alloy, wherein the chemical activity is greatly reduced, and a noble metal state phenomenon, called passivation. 
Metal generated by the role of the medium due to corrosion products, which has a dense structure, the formation of a layer of film (often invisible tightly covered in the outer of the metal, then change the state of the metal on the outer significantly to the positive direction, so that the electrode potential of the metal transitions become passive corrosion such as FeFe + + when the specification potential transition to +0.51 V-0.44V passivation shows precious metals corrosion performance, this film is called passivation film cold drawn steel pipe chromate solution with Miles hung metal appearance generated trivalent or hexavalent chromium layer, called passivation, Yiming chromium used for the disposal of aluminum, magnesium and their alloys can also form on the steel chromium layer, but rarely used alone, often phosphide and supporting the use of, to close the porosity of the phosphate layer, the phosphating layer bare steel passivation, to inhibit the corrosive effect of the remaining phosphating accelerator, to further increase the protective capacity cold drawn steel pipe passivation Usually using potassium dichromate solution (2 to 4 grams / liter, and sometimes 1 to 2 g of phosphoric acid was added) 80-90 degrees Celsius dip Tut 2-3 minutes to remove.

Hydraulic seamless pipe Steel pipes used in the hydraulic system is mainly made of stainless steel seamless pipe and ordinary seamless steel pipe, stainless steel seamless pipe has superior mechanical properties, but due to their cost, low accuracy, has not been commonly used. Ordinary seamless steel tubes are commonly used, but its poor mechanical properties, low accuracy, usually before use to go through a series of welding, test equipment, pickling, alkaline cleaning, washing, long string of oil, leak testing, process complex, time consuming and expensive material is not reliable, and has not been able to completely remove the residue in the pipe, and become a serious hazard for the entire hydraulic system failure at any time. Noted in the statistics, 70% failure in the hydraulic system is causes.
The ordinary complex process virtually seamless steel pipe used in the hydraulic system to become a high-investment, high-consuming work, and so greatly increase the cost.

Pressure pipe Pressure pipe refers to all pipes that can withstand the internal pressure or external pressure, regardless of the tube within the medium. Pressure pipeline is part of the pipeline, the pipeline is used for the transmission, distribution, mixing, separation, emissions, measurement, control and stop fluid flow, connected by pipes, pipe fittings, flanges, bolts, gaskets, valves, and other constituent elements or compression assembly consisting of assembly of the member and the support member.
Pressure pipeline characteristics:
1)Pressure vessel is a single device, pressure piping is a system, interrelated and influence each other - inter-related whole body, and the slenderness ratio, vulnerable to instability, the force is more complex;
2) Design of the pressure pipes in addition to considering the conventional factors (temperature, pressure, fluid properties, etc.), but also consider the flexible pipe, vibration and the support, and other factors;
3)Pipe pressure fluid flow state complex while the cushion is small, the frequency of the changes in working conditions is higher than the pressure vessel, such as temperature, pressure, fluid state, snow, and so may affect its force;
4)Constituent elements of pipeline, pipe supports and hangers, pipe insulation layer, each have their own characteristics and technical requirements, material selection and assembly difficulties;
5) Possible leak points on the pipeline more than the pressure vessel (only one valve usually there are five);
6) Piping layout, installation and inspection of pressure vessels there is a great difference.

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