... Steel Tube: a. O.D.: 1/2'' to 4'' b. W.T.:SCH40,80,160 c. Standards: DIN17175 Seamless round steel tube for ... and medium pressure seamless carbon steel tubepetroleum casing tube ,petroleum cracking tube, seamless steel tube ,seamless steel pipe,ASTM A106 seamless carbon steel ... . spiral steel pipe7. square steel pipe8. hot-galvanized steel pipe standard: API5CT, API5L, ASTM, JIS, DIN, GB , and so on. ...