ERW straight seam welded steel pipe (ERW Pipe), also known as "resistance welded straight seam welded pipe", ERW straight seam welded pipe is mainly pided into ERW AC welded steel pipe and ERW DC welded steel pipe two forms. ERW straight seam welded pipe is pided into low frequency welding, intermediate frequency welding, super intermediate frequency welding and high frequency welding according to the frequency. High frequency welding is mainly used for the production of thin-walled steel pipes or ordinary thick-walled steel pipes. High-frequency welding is pided into contact welding and induction welding.
ASTM A53 Gr.B is the grade in ERW high frequency welded pipe, pided into A and B grades. ASTM is only a set of specifications. ASTM steel pipe A53 A corresponds to the Chinese standard GB8163 raw material is 10# steel, and A53 B corresponds to the Chinese standard GB8163 raw material 20#.
For example: ASTM (standard) A53 (grade) gr is grade (abbreviation of grade) b (grade B)
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