About ERW welded steel pipe

Production Process

The production process of longitudinal welded pipe is simple, the production efficiency is high, the cost is low, and the development is fast. The strength of spiral welded pipe is generally higher than that of straight seam welded pipe. It can be used to produce welded pipe with larger pipe diameter with narrower blank, and can also be used to produce welded pipe with different pipe diameter with the same width blank. However, compared with the straight seam pipe with the same length, the weld length increases by 30~100%, and the production speed is low.

Welded pipes with large or thick diameters are generally made of steel billets directly, while thin-walled welded pipes with small welded pipes only need to be directly welded through steel strips. After simple polishing, wire drawing is OK.

Supplement: The welded pipe is welded with strip steel, so its position is not as high as that of seamless pipe.

Process flow of welded pipe

Raw material uncoiling - leveling - end shearing and welding - looper - forming - welding - removal of inner and outer weld beads - pre correction - induction heat treatment - sizing and straightening - eddy current testing - cutting - hydraulic inspection - pickling - final inspection (strict control) - packaging - shipment.

Product features

The production process of longitudinal welded pipe is simple, the production efficiency is high, the cost is low, and the development is fast. The strength of spiral welded pipe is generally higher than that of straight seam welded pipe. It can be used to produce welded pipe with larger pipe diameter with narrower blank, and can also be used to produce welded pipe with different pipe diameter with the same width blank. However, compared with the straight seam pipe with the same length, the weld length increases by 30~100%, and the production speed is low.

Scope of application

The products are widely used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction, and are one of the 20 key products developed in China.

For liquid transportation: water supply and drainage. For gas transmission: gas, steam, liquefied petroleum gas.

For structure: for pile driving pipe and bridge; Pipes for wharfs, roads, building structures, etc.