1. Heat exchanger tube 2. ASTM A213, A210-C, A179, A192, DIN17175 ST37. ... , WT: 1-80mm 4) Use for heater 1 Product name heat exchanger tube2 Production StandardASTM SA213, SA335, A369, A209, A250, G3462, G3467 ... Application:Widely used in oil, chemical industry, electricity, boiler industryof high-temperature resistance, low temperature resistance, corrosion resistance in pilie lines ...