... Steel Tubes for Boiler, Pressure Vessel & Heat Exchanger American Standard ASTM A53,ASTM A106,ASTM A333,ASTM A334,ASTM ... 37Mn,12CrMo,12Cr1MoV,15CrMo,35CrMo,10MoWVNb, etc. German Standard DIN 1629,DIN 17175 Grade St 37.0,St ... 3059-2, Grade 320,360,440,243 Japan Standard JIS G3454,JIS G3461,JIS G3462 Grade STP G370 ... 340,STB 410,STB510,STB A12,STB A22 European Standard EN 10216-1, EN 10216-2 Grade P235TR1, ...