Boiler Seamless Steel Tube: a. O.D.: 1/2'' to 4'' b. W.T.:SCH40,80,160 c. Standards: DIN17175 Seamless round steel tube for low and ... medium pressure seamless carbon steel tubepetroleum casing tube ,petroleum cracking tube, seamless steel tube ,seamless steel pipe,ASTM A106 seamless carbon steel pipe for high temperature service,seamless steel tube,seamless tube,seamless carbon steel tube ...