... heater tube carbon pipe seamless carbon tube astm a179 seamless carbon tube astm alloy steel pipe astm a209 T1 seamless alloy steel pipe2 Production StandardASTM SA213 ... T2, T5, T9, T11, T12, T22, T91, T92 A335: P1, P2, P5, P9, P11, P12, P21, P22, P91, P92 ... used in oil, chemical industry, electricity, boiler industryof high-temperature resistance, low temperature resistance, corrosion resistance in ...