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How to select LSAW and SSAW in API 5L spec line pipe?


According to the production process, API 5L specifications of the line pipe is divided into 8 kinds, seamless steel pipe, ERW steel pipe, submerged arc welded pipe and so on. But the most widely used type is seamless steel pipe, straight seam high frequency electric resistance welded pipe (Electric Resistance Welding, named as ERW), LSAW pipe (Longitudinally Submerged Arc Welding, named as LSAW), spiral submerged arc welded pipe (Spirally Submerged Arc Welding, abbreviated as SSAW), etc.

The size of seamless steel pipe and welded pipe is limited in different conditions, the larger diameter of that usually adopt longitudinal submerged arc welded pipe and spiral welded pipe.


Different opinions in selection of LSAW and SSAW:

According to the forming process, the SSAW pipe has a lot of residual tensile stress (Maximum up to 200 ~ 300 Pa). While in the process of UOE forming process, there is an enlarged diameter. The surface of that compressive residual stress is - 200 ~- 300M Pa.

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Henan Anson Steel Co., Ltd has the experience of export large quantities of API 5L line pipe and Line pipes of other standards, if you are interested in line pipe product price and details, don't hesitate to contact us now!

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