You can rest assured to buy customized Pengfa API 5L Longitudinal Welded Steel Pipe from us. we have many years of production experience, so my quality is far ahead of the industry, but we still strive to improve the quality and improve the delivery time to ensure our customers will receive the highest quality products. According to the production process of straight seam steel pipe, we can divide it into two kinds. One is high-frequency straight seam steel pipe, the other is submerged arc welded straight seam steel pipe.
We will be used to manufacture large diameter submerged arc welded straight seam steel pipe steel plate after the production line. First of all, we should carry out ultrasonic inspection of the whole plate, and then through the edge milling machine to the two edge surface of the steel plate for double-sided milling work, so that the surface of the two edge of the steel plate can achieve the required plate width and plate edge parallelism and groove shape. Then we use the prebending machine equipment to prebend the edge of the plate, so that the edge of the plate can have the required curvature. We then press half of our pre-bent steel sheet into a J shape by stepping it several times using a JCO forming machine. At the same time, we also need to step press the other half into a C shape, and finally form the open O shape.
The formed straight seam welded steel pipe is welded and gas shielded welding is used for continuous welding; The longitudinal multi-wire submerged arc welding is carried out on the inside of the straight steel pipe. The longitudinal multi-wire submerged arc welding is carried out on the outside of the straight seam submerged arc welding steel pipe. After the welding is completed, the first ultrasonic inspection, the first X-ray inspection, the diameter expansion and the water pressure test are carried out successively.
Then the qualified steel pipe is processed to the required size, and then the second ultrasonic inspection, the second X-ray inspection, the magnetic particle inspection at the tube end, the anti-corrosion and coating are carried out successively to complete the whole processing process. 2. High-frequency welding
High-frequency welding process is based on the principle of electromagnetic induction, as well as the skin effect of AC charge in the conductor, vortex heat flux effect and proximity effect. The edge steel of the weld is heated until it is heated to a molten state, and then the roller extrusion process is used to make the intergranular combination of the butt weld can be realized, so as to achieve the purpose of welding. High frequency welding belongs to a kind of induction welding, we can also be called pressure base welding. High-frequency welding does not need the filler material of the weld, and there is no welding splash during welding. The area affected by welding heat is narrow in the welding process, and the welding molding is very beautiful and the mechanical properties of welding are very good. Because of these advantages of high frequency welding, high frequency welding is widely used in the production of steel pipe.
The high frequency welding of steel pipe is to make use of the skin effect and proximity effect of alternating current. After rolling, the steel is formed to form a round tube blank with its section broken. One or a group of impedors are rotated in the tube blank near the center of induction coil, and the impedors form an electromagnetic induction circuit with the opening of the tube blank. Under the action of skin effect and proximity effect, strong and concentrated thermal effect is generated at the opening edge of the tube billet, which makes the weld edge quickly heated to the temperature required for welding. After the press roll extrusion, the molten metal realizes indirect crystal bonding, and forms a firm butt weld after cooling.
As the professional manufacture, we would like to provide you Pengfa API 5L Longitudinal Welded Steel Pipe. Straight steel pipe English (Straightsteel pipe), general welded pipe: general welded pipe is used to transport low-pressure fluid. Made of Q195, Q215A, Q235A steel, Q235B plain carbon. It can also be manufactured together with easy-to-weld 0317 standard model 6012 and steel mother 755 mild steel. Steel pipes are subject to water pressure, bending, flattening and other tests, and have certain requirements for surface quality. Usually, the delivery length is 4-10m, and it is often required to deliver in fixed length (or double length).
The specification of the API 5L Longitudinal Welded Steel Pipe is indicated by the nominal diameter (mm or inch). The nominal diameter is different from the actual one. The welded pipe has two types of ordinary steel pipe and thickened steel pipe according to the specified wall thickness. The welding process of submerged arc welding straight seam steel pipe is submerged arc welding technology, which uses filler welding and particle protection flux submerged arc. The diameter of production can reach 1500mm. LSAW is the English abbreviation of submerged arc welding straight seam steel pipe. The production technology of submerged arc welding straight seam steel pipe includes JCOE forming technology and rolling forming submerged arc welding technology.
When the diameter is large, two steel plates may be used for rolling, which will form a phenomenon of double welds. Standards that can be implemented are GB/T3091-2008 low-pressure fluid steel pipe production standards, GB/T9711.1-2-1997 oil and gas steel pipe production and use standards, and American API 5L Longitudinal Welded Steel Pipe execution standards. Production material: Q195A-Q345E; 245R; Q345QA-D; L245-L485; X42-X70. The pressure parameters mainly include 2ST/T, S is the yield strength, and T is the wall thickness. Submerged arc welding has been developed into two-wire submerged arc welding and multi-wire submerged arc welding, and the efficiency is further improved.
| Cold Drawn | Lu Li | 12m5130 | Lu Li | 12m5030 | Tobacco Big Seamless |
Giant Energy Expansion 7 mm |
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| 14*2-3 | 12000 | 57*3. 5 | 140*4 | 325*6.5 | 5500 | ||||||
| 16*2-4 | 8600 | 60*3.5 | 5000 | 140*5 | 4850 | 325*7 Big Seamless | 5260 | 377 | 5150 | ||
| 18*2-4 | 8300 | 76*3. 5 | 4880 | 140*6 | 4630 | 325*7*12 | 5450 | 426 | 5150 | ||
| 21*2-4 | 6900 | 76*4 | 4800 | 140*10 | 4630 | 325*9 | 8 mm | ||||
| 22*2-4 | 6900 | 89*4 | 4800 | 159*4.5 | 4880 | 325*10 | 377 | 4850 | |||
| 25*2-5 | 6300 | 108*4 | 4800 | 159*5 | 4660 | 356*8 | 5300 | 406 | 4850 | ||
| 27*2-4 | 6300 | 76*4. 5 | 4690 | 159*6 | 4630 | 356*8.5 | 5300 | 426 | 4850 | ||
| 27*5-6 | 6300 | 89*4.5 | 4690 | 159*7 | 4630 | 356*9 | 5300 | 457 | 5000 | ||
| 32*2.5 | 5800 | 108*4. 5 | 4690 | 159*8 | 4630 | 377*8Baotou Steel | 5450 | 480-530 | 5000 | ||
| 32*3 | 5250 | 73*5 | 4630 | 168*5 | 4750 | 377*8Tobacco | 610-630 | 5200 | |||
| 32*3. 5-4 | 5250 | 76*5 | 4630 | 168*6 | 4580 | 377*9 Tobacco | 9 mm | ||||
| 32*4.5 | 5250 | 89*5 | 4630 | 168*6.7 | 4580 | 377*9.5 | 5280 | 426-457 | 4800 | ||
| 34*3 | 5250 | 89*5.2 | 4630 | 168*7 | 4580 | 377*10 | 5280 | 480-530 | 4800 | ||
| 34*3. 5-4 | 5250 | 108*5 | 4630 | 219*6 | 4750 | 377*12 | 5300 | 610-630 | 4800 | ||
| 34*5-6 | 5250 | 76*6 | 4600 | 219*6.5 | 4760 | 406*9.5 | 5300 | 720 | 5100 | ||
| 38*3-4 | 5200 | 89*6 | 4600 | 219*7 | 4560 | 406*10 | 5300 | 820 | 5200 | ||
| 38*5-6 | 5200 | 108*6 | 4600 | 219*7.8 | 4560 | 426*8 | 5400 | 10mm | |||
| Hot Rolled | 114*4 | 4900 | 219*8 | 4560 | 426*9 | 5400 | 377*10 | 4750 | |||
| 42*3 | 4950 | 114*4. 5 | 4750 | 219*10 | 426*9.5 | 5300 | 426*10 | 4750 | |||
| 42*3. 5-4 | 4800 | 114*5 | 4630 | 273*6.5 | 4980 | 426*10 | 5300 | 480*10 | 4750 | ||
| 42*5-6 | 4800 | 114*5.7 | 4630 | 273*7 | 4760 | 457*9 | 508*10 | 4750 | |||
| 45*3 | 4900 | 114*6 | 4600 | 273*8 | 4750 | 457*20 | 530*10 | 4750 | |||
| 45*3. 5-4 | 4800 | 114*8 | 4600 | 273*8.5 | 4560 | Ju Neng Mo Long | 610*10 | 4850 | |||
| 45*5-6 | 4800 | 133*4 | 5000 | 273*9 | 4560 | 325*8 | 630*10 | 4850 | |||
| 48*3 | 4850 | 133*4. 5 | 4730 | 273*10 | 4560 | 325*9 | 720*10 | 5050 | |||
| 48*3. 5-4 | 4750 | 133*5 | 4660 | 325*8 | 4730 | 325*10 | 4580 | 820*10 | 5150 | ||
| 48*5-6 | 4750 | 133*6 | 4630 | 325*8.5 | 4640 | 325*11 | 4530 | 11mm or more | |||
| 57*3 | 4950 | 133*4Big Seamless | 5300 | 325*9 | 4610 | 325*12 | 4530 | 480 | 4750 | ||
| 57*3. 5 | 4700 | 27*2.7-3 | 6m | 6800 | 325*10 | 4580 | 325*13 | 4530 | 508 | 4750 | |
| 57*4 | 4700 | 32*3-4 | 6m | 5550 | 325*14 | 4530 | 530 | 4750 | |||
| 57*5-6 | 4700 | 34*3.5 | 6m | 5550 | Shandong | 325*15 | 4530 | 610 | 4850 | ||
| 60*3 | 4800 | 42*5 | 6m | 325*16 | 4530 | 630 | 4850 | ||||
| 60*3.5 | 4700 | 48*3. 5 | 6m | 5000 | 194*6 | 5000 | 720 | 5050 | |||
| 60*4 | 4700 | 57*3. 5 | 6m | 4950 | 219*6 | 4750 | 820 | 5150 | |||
| 60*5-6 | 4700 | 57*4 | 6m | 4950 | |||||||
| 6m fixed length*130 Middle disconnect*100 Stock small tube 6m fixed length*300 | |||||||||||
According to the production process, API 5L Longitudinal Welded Steel Pipe can be divided into high frequency straight seam steel pipes and submerged arc welded straight seam steel pipes. Straight seam steel pipes are mainly used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction.
Used for liquid transportation: water supply and drainage.
For gas transportation: gas, steam, liquefied petroleum gas.
For structural purposes: as piling pipes, as bridges; pipes for wharves, roads, building structures, etc.
