... 1 - 80mm 3) Manufacturing standards: GB, 4) seamless steel pipe -product name-main material-standard-usessize range(mm)stainless steel ... A335mASTMA213/A213mhigh-temperature resistant,Low temperature-resistant, corrosion-resistant Seamless pipe for Petroleum, chemical, electric power,Boiler industry16-824×2 ... for boilers and overheating14-426*1.5-4.5 line pipe 5L GR.B, X52,X60 API-for petroleum,natural ...