... test to ensure the best quality. Tubes used for low and medium pressure boiler working at a temperature below450°C ,Tubes ... , economizer, superheater and reheater, petrochemical line pipe etc. used for high pressure boiler working temperature between 450°C ~ 650 °C ... , 195GH, P235GH,TC1,TC2DIN 17175 ST 35.8,ST45.8,ST37.0,ST44.0,ST52.0JIS :G3454 STPG370,STPG410, G3461 STB340,STB410 ...