The difference between A283 Gr C and ASTM A285 grade C carbon steel

Both A283 Gr C and ASTM A285 grade C carbon steel are low to intermediate tensile strength carbon steel plates used primarily in the fabrication of storage tanks and other similar applications. However, there are some differences between the two materials.

The main difference is in their chemical composition. ASTM A283 gr C includes carbon, manganese, phosphorus, sulfur, and copper, while ASTM A285 gr C includes carbon, manganese, phosphorus, sulfur, and silicon. The maximum carbon content in both materials is 0.28%.

Another difference is in their minimum yield strength and minimum tensile strength. ASTM A283 gr C has a minimum yield strength of 30 ksi (or 205 MPa) and a minimum tensile strength of 55 ksi (or 380 MPa), while ASTM A285 gr C has a minimum yield strength of 30 ksi (or 205 MPa) and a minimum tensile strength of 55-75 ksi (or 380-515 MPa), depending on the thickness of the material.

Overall, both materials are suitable for use in moderate to lower-pressure services where there is good notch toughness and formability. It's important to consult with the supplier or manufacturer to determine which material is best suited for your specific application.