Production process and process of ERW pipe

　　Longitudinal ERW pipe production process is simple, high production efficiency, low cost, rapid development. Generally, the strength of ERW pipe is higher than that of longitudinal ERW pipe. It can be used to produce ERW pipe with larger diameter by using narrow blank, and ERW pipe with different diameter can be produced with blank of same width. However, compared with the straight seam pipe of the same length, the weld length increases by 30 ~ 100%, and the production speed is lower.

　　Large diameter or thick ERW pipe is usually made of steel billet directly, while thin-walled ERW pipe with small diameter only needs to be directly welded by steel strip. After simple polishing, wire drawing is used.

　　Process flow of ERW pipe: raw material uncoiling - leveling - end shearing and welding - looper - forming - Welding - removal of internal and external welding beads - pre correction - induction heat treatment - sizing and straightening - eddy current testing - cutting - hydraulic inspection - Pickling - final inspection - Packaging - delivery.