... ,XXS Standard: ASTM,DIN,BS,ANSI,JIS,EN DIN 2458 carbon steel welded pipe with good quality :High quality,low price,multi-standardCertificate ... .Structure type: seamless pipe,straight steel pipe,square pipe,spiral pipe ,and so on.Deaign and manufacture std: DIN carbon steel flangesMaterial:Rst37.2,St37.2 ...