... ourself)StandardAPI 5CT ,API 5L,ASTM A53, ASTM 106ASTM A179, ASTM A192,ASTMA210,ASTM A213,ASTM A519,ASTM A333,ASTM A334,JIS G3445,JIS G3454 ... -SCHXXSMaterialStandardAPI 5CT ,API 5L,ASTM A53, ASTM 106ASTM A179, ASTM A192,ASTMA210,ASTM A213,ASTM A519,ASTM A333,ASTM A334,JIS G3445,JIS G3454 ... #, 45#, 16Mn, Q195, Q235, Q345B, 30CrMo, 42CrMo Standard: ASTM-A106/A53/API5L Gr.B ST44, ST52 GB/8162, GB ...