... API carbon steel pipe/steel tube 1.Type: smls welded 2.Material: a106b a53b 3.Standard: ASTM, DIN,JIS 4.Size:1/2"-48" ISO/API carbon steel pipe/steel ... , 310S, 409, 410, 420, 430 etc. Carbon Steel: ASTM A 106, A 53, API A 5L Gr A, B, C, ASTM A 333 ... , Gr 1 to 6 Alloy Steel: ASTM A 335, ... ; we will offer you our best price. ISO/API carbon steel pipe/steel tube