... OEM service offered ISO9001:2000 quality management certification 1. Type:alloy steel pipes,carbon steel pipes,stainless steel pipes,welded steel ... pipes and so on2. Materials:carbon steel,alloy steel,stainless steel.3. Standard:ISO9001,2000 certified,ANSI,JIS ... WPBA 106B ,A333,Gr6,A182,SA105,S10C,S20C,S30C,S45C,XC 10,XC12,XC32,XC38H1ALLOY STEEL :A234 WP11,WP 12,WP22 ...