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A53 API5l GrA GrB DIN2458 EN10217 ERW HFI EFW Welded Steel Pipe Carbon Steel Tube OD1/2'-48' Steel Grade: BS:1387, EN10217:S185, S235,S235JR, S235 G2H, S275, S275JR, S355JRH, S355J2H, St12, St13, St14...