ASTM A671 steel pipe
We are professional in manufacturing JCOE PIPE
The specification of JCOE PIPE
1. The plate used in the manufacture of large diameter submerged-arc welding straight seam steel pipe, steel plate into the production line after the first full plate ultrasonic inspection;
2. The edge milling: through the two edges of the steel plate edge milling machine double-sided milling, make it meet the requirements of plate, plate edge parallelism and groove shape;
3. The bending edge: the use of bending machine for plate bending, make the edge of curvature;
4. Molding: on the JCO forming machine bending of the plate after half after many step punching, pressure into a "J" shape, and the other half of the steel plate bending, same pressure into a "C" shape, eventually forming the opening "O" shape.
5. Early welding: the forming of straight seam welded steel pipe joint with gas protection welding and continuous welding (MAG);
6. The welding: the columns more wire submerged arc welding wire (up to 4) in the straight seam welded steel pipe inside;
7. The welding: adopting many wire submerged arc welding of columns in the side of straight seam submerged arc welding steel pipe welding;
8. Ultrasonic inspection Ⅰ: inside and outside of straight seam welded steel pipe weld and weld on both sides of the base of 100% of the check;
9. X-ray Ⅰ: 100% of inside and outside weld X-ray industrial TV inspection, using image processing system to ensure the sensitivity of detection;
10. Hole enlargement of submerged arc welding and straight seam steel pipe length hole diameter in order to improve the size precision of steel tube, and improve the distribution of stress in steel tube.
To ensure reliable installation and sealing of ASTM A671 steel pipe, strict dimensional and tolerance requirements are imposed:
Outer diameter: 10.3mm-2032mm, tolerance ±0.75%;
Wall thickness: 1.7mm-50.8mm, tolerance ±10%;
Straightness: Deviation ≤1.5mm per meter, total length deviation ±50mm;
End treatment: Perpendicularity deviation ≤1°. If welding is required, a "V-groove" with an angle of 30°±5° and a blunt edge of 1-2mm can be processed.
When ASTM A671 steel pipe is put into service, it undergoes quality inspection to ensure 100% coverage of critical defects. Non-destructive testing of welds, mechanical testing, and hydrostatic testing are performed, and only qualified pipes can be put into service.
What applications are ASTM A671 steel pipes used for? When it comes to applications, performance is the primary factor. A few examples will help users make their choices:
Energy Transmission: Even when used in ultra-low temperatures of -162°C, it maintains excellent toughness. This is particularly true for the China-Russia natural gas pipeline project, where ASTM A671 steel pipes account for 35% of the application.
Power Industry: High-pressure boiler pipes in thermal power plants operate at pressures up to 16 MPa. The cost of using ASTM A671 steel pipes is 30% lower than that of seamless steel pipes.
Marine Engineering: Marine environments place even higher demands on steel pipes, requiring not only corrosion resistance but also a long service life. Therefore, ASTM A671 steel pipes are the perfect choice.
FAQ
Q:What's the MOQ for your products?
A:Usually 100 tons .
Q:What's the payment terms?
A:T.T with 30% downpayment,70%before shipment.or L/C at sight.
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