... Standard: ASTM, ASME, AMS, DIN, ISO, JIS Designation:Grade 1- Grade 4, Grade 5, Grade 7, Grade 9, Grade 11 Chemical composition ... ). Cp grade 3 is almost used in pressure,vessel. (4). Cp grade 4 can be used in some fittings parts and fastening ... pieces, but for complex shape need 300 degree celsius to form ...