Q235 and Q235B are commonly used grades of carbon steel in China. They are equivalent in terms of chemical composition and mechanical properties, with Q235B being a more refined version of Q235. Q235 and Q235B carbon steel plates typically have a carbon content of about 0.14-0.22%, manganese content of 0.30-0.70%, silicon content of 0.30%, and other trace elements.
The minimum yield strength of Q235/Q235B carbon steel plates is 235 MPa, indicating its relatively high strength compared to low carbon steels. The ultimate tensile strength of Q235/Q235B carbon steel plates is usually around 375-500 MPa, depending on the plate thickness. Q235/Q235B carbon steel plates exhibit good ductility and weldability. They can be easily formed and welded using common methods such as welding, bending, and machining.