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 boiler Seamless steel ... 1M-13M, can as customers requirementSIZE: 1/8" to 24"W.T SCH 5, SCH 10, SCH 20, SCH 40, SCH ... Q235, ST52,ST42,A106 -a, A106-B , and so on Boiler seamless carbon steel tube