Dn1400 Astm A53 Grb Erw Welded Straight Pipe

API L360 Straight Seam Steel Pipe

Hebei Chengyuan Pipe Industry Group Co., Ltd.

Production process:

1. Plate detection:After the steel plate used to manufacture large diameter submerged arc welded straight

seam steel pipe enters the production line, the whole plate is first inspected by ultrasonic wave.

2. Milling edge: The two edges of the steel plate are milled by a milling machine to achieve the desired

width, edge parallelism and groove shape.

3. preflanging: pre bending machine is used to pre bend the edge of the plate, so that the edges of the

board meet the required curvature.

4. Forming: On the JCO forming machine, half of the pre-bent steel plate is stamped several times to

form a "J" shape, then the other half of the steel plate is equally bent to form a "C" shape, and then an

open "O" shape is formed.

5. Pre-weld: weld the formed straight seam steel pipe and use MAG for continuous welding

6. internal welding: longitudinal multi wire submerged arc welding (more than four wire)is used to weld

the inner side of the straight steel pipe.

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Product Categories : Straight Seam Steel Pipe