ISO/API carbon steel pipe/steel tube 1.Type: smls welded 2. ... .Standard: ASTM, DIN,JIS 4.Size:1/2"-48" ISO/API carbon steel pipe/steel tube1.Type: smls welded2.Material: a106b ... , 420, 430 etc. Carbon Steel: ASTM A 106, A 53, API A 5L Gr A, B, C, ASTM A 333, Gr ...