LSAW Line Pipe X70
LSAW Steel Pipes are mainly used on long distance transportation pipeline for oil, gas, liquid coal etc. And also can be applied to construction project, power station, petrochemical industry etc. Longitudinal Submerged-Arc Welded Steel Pipe Process: 1. The steel plate enters into the production...
LSAW Steel Pipes are mainly used on long distance transportation pipeline for oil, gas, liquid coal etc. And also can be applied to construction project, power station, petrochemical industry etc.
Longitudinal Submerged-Arc Welded Steel Pipe Process:
1. The steel plate enters into the production line after the first full plate ultrasonic inspection;
2. Steel plate 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: 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 Longitudinal 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; adopting many wire submerged arc welding of columns in the side of straight seam submerged arc welding steel pipe welding;
7. 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.
8. X-ray inspection: 100% welding seam X-ray industrial TV inspection, using image processing system to ensure the sensitivity of detection.
9. Hydraulic test:LSAW line pipe should subject to Hydraulic test according to API 5L parameter.
10.Packaging: Fusion bond Epoxy coating, Coal Tar Epoxy, 3PE, Vanish Coating, Bitumen Coating, Black Oil coating as per customer’s requirement.
LSAW supply available:
Wall Thickness: 10 - 50mm
Length:6 – 13m
Standard:API 5L, GB/T9711
Steel Grade:API 5L: GR B, X42, X46, X56, X60, X65, X70 PSL1, PSL2
GB: Q195, Q215, Q235, Q345, L175, L210, L245, L320, L360- L555
Delivery Time: Mostly in 30 to 60 days.
Payment：30% T/T advance, 70% T/T or L/C at sight balance of copy of B/L.