... DIN2605 JISB2311 JISB2312 JISB2313, BS, GB, ISOmaterialCarbon steel(ASTM A234WPB,,A234WPC,A420WPL6. 20#,Q235,10#,20 ... #,A3, Q235A, 20G,16Mn, ect)Stainless steel(ASTM A403 WP304,304L,316,316L,321. ... for clients'requirementsapplicationPetroleum, chemical, machinery, electric power, shipbuilding, papermaking, construction, etcSpecial design available as the requirement of customer oil well drilling ...