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ASTM A252 standard covers nominal wall cylindrical steel pipe piles in which the steel cylinder acts as a permanent load-carrying member or as a shell to form cast-in-place concrete piles. Each welded pile shall be made by seamless, electric resistance welding, flash welding or fusion welding with longitudinal, helical-butt, or helical-lap seams. This specification also deals with material tensile requirements, minimum elongation values and common size and weights per unit length values.  SSAW pipe is made of hot rolled coiled steel by automatic submerged arc weld under normal atmospheric temperature. All the pipes are produced according to API Spec 5L, GB/T9711.1, GB/T9711.2, ASTM A252-89 standard. These pipes mainly used in petroleum and natural gas industry to transport flammable and non-flammable liquid and steel construction. O.D.:219-3040mm W.T.:5-30mm Steel Grade: ASTM A252 Grade1, Grade2, Grade3 Standard pipes and tubes for piles, columns, structural and other mechanical uses. Piling pipes for low-pressure, high-density purposes

Steel pipe for pipe technology, can be pided into (SML), mainly as the Oilfield internal transportation pipeline and small-diameter high-pressure natural gas pipeline, used for a small number of long-distance gas pipeline, the vast majority of long-distance pipeline with Direct seam high frequency (ERW), spiral submerged arc (SSAW), LSAW three (LSAW). The following table several steel pipes process characteristics and quality of performance comparison: ERW pipes means Electric Resistance Welded Pipes. ERW steel pipes and tubes are used. Spiral submerged arc welding(SSAW) is its forward direction and forming tube centerline hose reel molding angle (adjustable), side molding edge welding and weld them into a spiral. Spiral submerged arc (SSAW) is its forward direction and forming tube centerline hose reel molding angle (adjustable), side molding edge welding and weld them into a spiral, the advantage of the same specification to produce a variety of diameter sizes steel pipe, raw materials to adapt to a wider range, the weld can avoid the main stress force better, the disadvantage is the poor geometry of the weld length compared to the long straight seam pipe, prone to cracking, porosity, slag, welding partial welding defects such as welding stress was tensile stress state. General Oil and Gas Pipeline design specification spiral submerged arc can only be used for Class 3, Class 4 regional. Raw materials instead will this process improvement abroad steel plate forming and welding separate pre-weld and lean and, after welding cold flaring near UOE pipe welding quality, currently no such process of plant improvement direction. “West-East” still is a traditional craft production, just expanded diameter of the pipe end. United States, Japan and Germany, the overall negative SSAW, think the mainline unfit for use SSAW; Canada and Italy part SSAW Russian small amount of SSAW, and have developed a very strict supplementary conditions, due to historical reasons, the majority of the domestic main trunk or use SSAW. High frequency straight seam welding (ERW) method is pided into two forms of induction welding and contact welding, hot-rolled wide volume as raw material, pre-curved, continuous molding, welding, heat treatment, sizing, straightening, cutting, etc. process, compared with the spiral weld short, high dimensional accuracy, uniform thickness, surface quality, pressure advantages, but the drawback is that only the production of small and medium-caliber thin-walled tube, weld easy to produce gray leaf spot, not fusion ditch-like corrosion defects. Wider application areas of city gas, crude oil transportation. In High Frequency Induction (HFI) Welded Pipe production process, hot rolled steel coils are fed with a high capacity accumulator in order to achieve continuous welding. LSAW in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production. A wide range of the finished product specifications, weld toughness, ductility, uniformity and dense, with a large diameter, wall thickness, high pressure resistance, low-temperature corrosion resistance, etc.. Required steel pipe in the construction of high-strength, high toughness, high-quality long-distance oil and gas pipelines, mostly large diameter thick wall LSAW.

Spiral welded steel pipes are widely used in Oil, Natural Gas, Water and other flammable & nonflammable liquid conveyance and distribution pipelines, steel structures for construction and other general purposes by means of their wide size range. Widely preferred longer lengths up to 18,5 m. considerably decreases the cost of pipeline construction resulting in less number of girth welds compared to shorter pipe lengths. When weld ultrasonic testing, in order to track the weld automatic tracking, the probe is always in the frame just above the weld. The system uses laser vision technology to detect traces of the weld, using IPC and motion control components work together to reach out manual control, automatic track welds, adjust the probe holder the right destination location.  Laser weld ultrasonic testing automatic tracking system consists of a laser vision sensor, data processing means for controlling the composition and executing agencies. Laser vision sensor comprises a CCD camera and a semiconductor laser; data processing agencies, including image acquisition card, and industrial control computer; including PLC control mechanism and stepper motor drives; positioning actuator includes a skateboard, a stepper motor and connected institutions. System in real time using laser vision sensor weld image; industrial control computer through a dedicated software processing to obtain the image feature points to calculate the deviation of the weld, width, and other parameters the wrong side, and then send control commands through PLC, the drive to drive a stepper motor driven skateboard and probe holder back to the correct position. Laser weld ultrasonic inspection system in the design and manufacture of automatic tracking process to fully consider the scene, laser vision sensor uses a high anti-jamming equipment , stable and reliable; data processing bodies and control mechanisms are used for industrial equipment, common good, low failure rate, easy maintenance; executive body of imported ball screw and linear guide rail, high precision, durable, good dustproof performance.  For spiral weld ultrasonic inspection, testing is now more commonly used method, which is to weld pipe arranged on both sides of a number of ultrasonic shear wave probes, parallel motion detection pipe weld seam parallel or perpendicular to the seam weld defects.

Stainless steel tee of non die drawing process is a use of metal flow stress with temperature changes in the nature and the realization of flexible plastic processing technology, is a kind of high precision, high efficiency, low energy consumption, no pollution, no mold, no friction, no lubrication near net forming technology. Different tensile properties of different materials. The limit of the tensile rate is the ratio between the blank diameter and the diameter of the punch. Three stainless steel material control in 2.1 to 2.2 and carbon steel control in 2.15 to 2.5. Three stainless steel material can be second times in deep drawing deep drawing, but unlike carbon steel, three stainless steel material is usually not the same degree of tension and the first time after the heat treatment, unless. Three stainless steel material requirements equipment strength is 1 to 2 times of carbon steel equipment. Three stainless steel In general, deep drawing by double acting hydraulic equipment. On the three stainless steel in dieless tensile deformation of wall thickness were studied, analyzed the influence factors and influence laws of three stainless steel in dieless drawing of wall thickness variation. The three stainless steel in dieless drawing wall thickness formula. wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com) provides stainless steel elbow, stainless steel tee, stainless steel flange, stainless steel pipe, stainless steel reducer, such as size, affordable, welcome new and old customers to come to consult! If any inquiry about products, please feel free to contact us sales@wilsonpipeline.com

SAW steel pipes is short of Submerged Arc Welding Steel Pipe, which it is a use of submerged arc soldering process to manufacture steel, the process produces a very high current density, the flux layer to prevent the rapid loss of heat, and concentrated in the welding region. Submerged arc weld of high quality, high production efficiency, arc and smoke a few characteristics of submerged arc welded pipe is widely used in pressure vessels, pipe manufacturing, beams, low pressure fluid, steel works. The main products of the SAW steel pipes LSAW Steel Pipe, Longitudinally Submerged Arc Welding Steel Pipe LSAW steel pipe, it is the use of submerged arc welding production of straight seam steel pipe. ERW is a electric-resistance welded steel pipe, Resistance welded steel pipe is pided into exchange of welded steel pipe and DC welded steel pipe in two forms. AC welding in accordance with different frequencies are pided into low-frequency welding, IF welding, welding of ultra-IF and high-frequency welding. High-frequency welding is mainly used for the production of thin-walled steel pipe or wall thickness steel pipe, high frequency welding into contact welding and induction welding. DC welding is generally used for small-diameter steel pipe. So, in terms of comprehensive, high-frequency welded pipe included in the ERW pipe is a high-frequency welding process to produce ERW pipes. ERW Longitudinal advanced product performance in the field of oil and gas storage and transportation, quality leadership, more economical steel pipe. Difference between SAW and ERW steel pipe As ERW steel pipe and SAW steel pipe in the pipe during forming, welding and process is different, so that two kinds of steel pipe in the performance there are some differences. (1) ERW steel pipe surface quality is superior to spiral submerged arc welded pipe, ERW steel pipe surface is smooth, smooth, beautiful, SAW steel pipe internal and external weld reinforcement.  (2) ERW steel pipe weld defect types is less than the saw steel pipe. Saw steel pipe with solvent deposited, more types of defects, in addition to volume defects, there are wire-line trap. ERW steel pipe weld defects only wire-line and straight welds, the inspection process easy to follow, and the defects in the maximum reflection at, once the lack of implicit, ultrasonic reflecting the strong, easy to detect.  (3) ERW steel pipe related to saw steel pipe in residual stress ratio is low. Since ERW pipe deformation in the deformation process more fully, coupled subsequent sizing flat oval, elliptical vertical changes and necking, making ERW pipe residual stress becomes smaller. Physical testing showed that the same specifications, the same material ERW pipe after incision along the axis, the axial and transverse incisions smaller displacement than the spiral submerged arc welded pipe.  (4) ERW steel pipe overall performance of the same, when the pipe becomes defective, steel scrap judgment, allow welding. SAW steel pipe allowed, and pipe welding performance and overall performance is inconsistent, welding place prone to stress corrosion cracking. Experiments show that stress corrosion fatigue test ERW pipe spiral submerged arc welded pipe length than life.

(Double Submerged Arc Welded Pipe) DSAW pipe is available in straight and spiral welded formats and used in a variety of applications. The submerged welding process protects the steel from contamination of impurities in the air. Both inside and outside welds are performed. DSAW pipe (Double Submerged arc welded pipe) DSAW pipe can be specified in very large diameter and to exact inside or outside dimensions. Spiral Welded steel pipe is distinguished by the manufacturing process that results in a spiral DSAW seam the length of the pipe to lengths of 155 feet. The manufacturing of Double Submerged Arc Welded Pipe involves first forming steel plates into cylindrical shapes. Then the edges of the rolled plate are formed so that V-shaped grooves are formed on the interior and exterior surfaces at the location of the seam. The pipe seam would then be welded by a single pass of an arc welder on the interior and exterior surfaces. The welding arc is submerged under flux. What can be known as an advantage of this process is that welds would penetrate 100% of the pipe wall and produce a very strong bond of the pipe. Full Supply Ltd have been supplying EFW Electric Fusion Welded Pipe for many years. We supply DSAW Pipe to the folowing industries on a global scale: Oil Industry Gas Industry Filtration Industry Refrigeration Industry Refining Industry Petrochemical Industry Offshore Industry

Chinese stainless steel reducer industry imbalance, in the current stainless steel reducer output sharply, under the situation of billet origin is serious, first rely on outsourcing, iron ore prices to add stainless steel reducer capital, unable to take part in the intense market competition, to the company production and operation form. Other, first skills economic goals need to be further improved, and hot rolled steel products in China (grey – material) yield about 93%, meanwhile, hot-rolled seamless stainless steel reducer (grey – material) yield and depending on the skill and equipment level is not the same as shake is larger, leading skills mill usually is 90-92%; Skills behind the mill only about 80%; Ahead of the mill for more than 75%, behind the mill for less than 70%. Therefore, the target with the international leading level, than there was distance needs to be improved, to advance the competitiveness of the stainless steel reducer, must improve production skills, together with the origin of embryo material question, as long as it can make reducer professional go further. wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com) provides stainless steel elbow, stainless steel tee, stainless steel flange, stainless steel pipe, stainless steel reducer, such as size, affordable, welcome new and old customers to come to consult! If any inquiry about products, please feel free to contact us sales@wilsonpipeline.com

Gas pipeline by pipe process can be pided into seamless steel pipe (SMLS), ERW steel pipe SSW steel pipe ,LSAW steel pipe ,HFW steel pipe etc… mainly as a field gathering pipe and internal high-pressure natural gas pipeline of small-caliber, long-distance pipelines for oil and gas a small number, the vast majority of long-distance pipeline is the use of high-frequency straight seam welded pipe (ERW), spiral submerged arc welded pipe (SSAW), LSAW steel pipe (LSAW) three.The following table shows the characteristics of several steel process and quality performance comparison: Foreign raw materials will be changed to improve this process steel, so that separate forming and welding, the welding and lean pre-, post-weld cold-expanding, then the quality of welding close to the UOE pipe, currently there is no such process,is the spiralFactory directions for improvement. “Natural Gas” is still used by the traditional spiral process of production, but the tube side of the expander.United States, Japan and Germany in general negative SSAW, that trunk should not use SSAW; Canada and Italy, some use SSAW, Russia, a small amount of use SSAW, and have developed a very strict additional conditions, due to historical reasons, most still use the main trunk domestic SSAW. LSAW pipe (LSAW) is a single plate as raw material, steel in the mold or molding machine pressure (volume) into the tube, using double-sided submerged arc welding method and Expanding from the produce. Spiral submerged arc welded pipe (SSAW steel pipe) is the strip volume control when the forward direction and forming a molding pipe centerline angle (adjustable), side molding edge welding, the weld into a spiral, the advantage of the same specifications of the strip can beproduction of a variety of diameters of pipe, meet a wider range of raw materials, welds can avoid the main stress, the force is better, the disadvantage is poor geometry,the weld seam length compared to the straight pipe length, easy to produce cracks, pores, slag, welding and other welding defects side, welding stress was tensile stress state.General long-distance gas pipeline design specification spiral submerged arc welded pipe can only be used for Class 3, Class 4 area. Straight seam high frequency welded pipe (ERW steel pipe) by welding and induction welding is pided into different exposure to welding in two forms, using broadband hot-rolled coils as raw materials, pre-curved, continuous molding, welding, heat treatment, sizing, straightening, cutting and other processes, and spiral welded pipe weld compared to the short, high dimensional accuracy, uniform thickness, surface quality, the advantages of higher pressure, but the drawback is that only produce small-caliber thin-walled tube, easy to produce weldsgray leaf spot, not fusion, groove-shaped corrosion defects. At present more extensive application areas of the city gas, crude oil transportation and so on. The wide range of product specifications, weld toughness, ductility, good uniformity and dense, with a large diameter, wall thickness, high pressure, low temperature corrosion resistance and other advantages. In the construction of high-strength, high toughness, high-quality long-distance gas pipeline, most of the required large diameter thick wall steel pipe LSAW pipe.According to API standards, in large oil and gas pipelines, when through the alpine zone, sea, cities and other densely populated areas Class 1, Class 2 areas, LSAW pipe is the only designated suitable tube.By forming different ways can be pided into: UOE welded pipe: sheet steel at the edge of the pre-bend, the U shape, O shape, welded inside and outside welding, mechanical cold Expanding processes;  JCOE pipe: ie “JCOE” pre-welding, forming, welding and other processes by the cold expander; HME pipe: the mandrel rolling basis over the “CCO” forming, welding and other processes by the cold expander.

HDPE pipe (High-density polyethylene jacket pipe) is widely used in oil pipeline, gas pipeline, urban heating pipe, water pipe, electricity and other corrosion engineering, product quality and service by the users of a good level.High Density Polyethylene (HDPE) Jacketed System is designed for piping systems above or below ground suitable for inside or outside applications. High quality polyurethane foam insulation combined with a durable watertight jacket supplied in 20′ or 40′ lengths, means an economical, high-quality system. High density polyethylene jacket corrosion structure: the outer surface of pipe wrapped in high-density polyethylene material, with a high mechanical strength and excellent corrosion resistance, can protect the steel in the transportation, installation and use of the process to avoid external factors the damage. Manufacture of stent should be added antioxidants, UV stabilizers and carbon black, etc. Polyethylene jacket tube easy to aging, such as open storage tarpaulin and other items appropriate to cover, dumps should stay away from high heat and fire, anti-corrosion steel pipe made after the ban exposure, sudden cold, or polyethylene jacket tube easy to crack, the impact product performance and service life.  Calculated as follows: OD ≤ 400mm, the upper and lower deviation, and = 0.1 × of the nominal wall thickness of +0.2 Diameter ≥ 400mm, the upper and lower deviation = 0.15 × the sum of the nominal wall thickness of +0.2 3PE Coating Steel Pipe Coating Material : Epoxy Powder, Adhesion, Polyethylene Or Polypropylene, Cement Inside  Standard: API 5L (PSL1, PSL2); GB/T 9711.1;  Grade: Gr. B, X42, X46, X52, X60, X65, X70, X80; Q235B; Gr. C;  Seam: SAW, SSAW; HSAW

Stainless steel elbow to normalizing and tempering heat treatment, machining port, wall thickness is required to wear and machining allowance. The general allowance is 10% to 20% of the wall thickness of the elbow. The smaller the D ratio of the wall thickness and the section diameter, the better the fitting performance of the die, but the more easily the inner arc of the bend is lost. According to the metal in the plastic deformation of constant volume, push in the form of constant wall thickness (actually slightly thin), elbow arc length and equal to the length of the billet, derived push system tube diameter formula: if the actual choice of the tube diameter than the calculated according to the formula, the DP value, mold and joint performance is good, but in the elbow of the arc easily wrinkling. If the actual selection of tube blank outside diameter ratio is calculated by the formula of Dp value, the result is just the opposite. The principle of determining the stainless steel elbow heating temperature is above material austenitizing temperature, and push the system elbow inside the main compressive stress is less than the yield limit under the temperature of materials. Material austenitizing temperature is higher, the higher the heating temperature. The higher the material yield limit of high temperature, the higher the heating temperature.

The stainless steel cap also called plug or head: is one of the main pressure parts of pressure vessel. The role of the seal is sealed. One is made of tank pressure on the bottom of the container, the two is the end of the stainless steel pipe, not ready to extend forward, then with a header in the stainless steel pipe welding in the form of sealed. Stainless steel blind plate and a stainless steel pipe and stainless steel head of the role is similar to the products, but the two product is detachable. And the head is welded after welding can not be re removed. Stainless steel cap quality is directly related to the long-term safe operation of pressure vessels. Supporting the pipe fittings are pressure vessels, stainless steel pipe, stainless steel flange plate, stainless steel elbow and other products. Usage: the pipe fittings are welded on the pipe end or the pipe end is arranged on the outer thread of the pipe end. Used to close the pipeline, the same role with the plug. The stainless steel cap includes the design of convex cap, conical shell, reducer, flat cover and tight mouth. The convex cap includes a hemispherical, oval disc cap, cap and spherical cap. From the stress angle convex cap from the hemispherical cap is not good, but from look on the manufacturing difficulty, has good manufacturing. Path diameter: DN15-DN1200 Wall thickness: SCH5-SCH160 Standard: DIN JIS BS GB/T JB SH ASME HG Uses: water, beverages, beer, food, petrochemical, nuclear power, machinery, medical equipment, fertilizer, shipbuilding, water treatment, pipes, etc. Stainless steel cap is petroleum chemical industry, atomic energy to food, pharmaceutical and many other industries pressure vessel equipment is an indispensable important component.

Hot-dip galvanizing (HDG), as referenced is the process of dipping fabricated steel into a kettle or vat of molten zinc. While the steel is in the kettle, the iron metallurgically reacts with the molten zinc to form a tightly-bonded alloy coating that provides superior corrosion protection to the steel. (HDG pipes) Hot dip galvanized steel pipes are used in the following fields, steel structure, build structure, transportation of low pression liquid and gas etc. our products are exported to about 50 countries in the world, we get a lot of recognition from many customers since our good quality and service.Production standard: and in wall thickness as shown in Table 1. GB/T 3091-2001, BS1387 / 1995(UK),BS4568:1970,DIN 2440/2448, ASTM A53Material:SPHC,SPHD,SPHE,Q195-Q235,SAE1006Size: OD (6-610 mm) x WT (1-50mm)GTC (galvanized threaded and coupling) steel pipe: DN15-DN200 (NB1/2″-NB8″)GPE (galvanized plain end) steel pipe: DN15-DN200Grooved steel pipe: DN15-DN200 (NB1/2″-NB8″)Section type: round, square, rectangular, oval and other special section type. Pre-galvanized steel pipe HSS (Hollow Structural Steel) Cold rolling – to 8” x 8”, 12” x 4” (easy way), 8” x 6” (hard way)Draw bending – to 4” x 4” (easy and hard way)Cold bending – to 8” x 8”