... : stainless steel,carbon steel,alloy steelStandard: ANSI,JIS,BS,DIN,ASME,API,GB,ectProcess: Cold Draen,Cold Rolled,EFW,ERW,Hot ... Rolled,SAW.and so on.Structure type: seamless pipe,straight steel pipe,square pipe,spiral pipe ,and so on.Deaign and manufacture std: DIN ... ******We can supply all kinds of pipes, seamless pipe,straight steel pipe,square pipe,spiral pipe ,and so on.If you have any questions ...