... ,ASME,DIN,JIS Certificate:API,ISO,CCS SCH 40 steel tube ProductionSteel pipeTypeSeamless and ERWSize1/2" To 24"Wall thicknessSch5S-Sch160 ... , CCS,and ISO9001:2000Productivity200000 ton per yearKeywords: SCH 40 steel tube,carbon steel tube,seamless tube