... reasonable FOB Tianjin port price 3.API/ISO certification carbon steel elbowsProfessional manufacturer(32years) WT:SCH5~SCH160 Standard:ASME ... STD, XS, XXS, SCH 10 ~ SCH 160Material:1 CARBON STEEL ASTM A234 WPB, WPC; ASTM A420 WPL9, WPL3, ... certification:ISO9001:2000 , API , BV , SGS, CEApplications range: Petroleum, chemical, power, gas, metallurgy, shipbuilding.construction,water and nuclear power ...