What is ASTM A53 Type S, Type E, Type F Tubing

 We used to know that A53 has two grades, A and B. However, in recent years, we have often heard of A53 S, F and E. What do these represent?

A53 S type actually refers to ASTM A53 Grade B seamless pipe, which is generally formed by extrusion. Type E uses resistance welding on the longitudinal axis, specifically ASTM A53 A/B grade two resistance welded pipes, the longitudinal joints are welded by the heat generated by the resistance between the two ends of the pipe. Type F refers to A53 grA grade furnace butt welded continuous welded pipes, and the longitudinal joints are welded by forge welding.

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From:http://boilersteelpipe.com/pro/smls/what-is-astm-a53-type-s,-type-e,-type-f-tubing.html

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