1.What is Q235B steel?
Answer: Q235B is a carbon structural steel according to Chinese standard GB/T 700. "Q" stands for yield strength, "235" indicates the minimum yield strength of 235 MPa, and "B" represents the quality grade with impact testing at room temperature.
2.What is 20# steel?
Answer: 20# steel is a quality carbon structural steel according to Chinese standard GB/T 699. "20" denotes an average carbon content of 0.20%. It is commonly used for mechanical parts and pipes.
3.What are the chemical compositions of Q235B steel?
Answer: Typical chemical composition of Q235B steel: Carbon (C) ≤ 0.20%, Silicon (Si) ≤ 0.35%, Manganese (Mn) ≤ 1.40%, Phosphorus (P) ≤ 0.045%, Sulfur (S) ≤ 0.045%, with traces of other elements.
4.What are the chemical compositions of 20# steel?
Answer: Typical chemical composition of 20# steel: Carbon (C) 0.17-0.23%, Silicon (Si) 0.17-0.37%, Manganese (Mn) 0.35-0.65%, Phosphorus (P) ≤ 0.035%, Sulfur (S) ≤ 0.035%, and sometimes chromium (Cr) ≤ 0.25%, nickel (Ni) ≤ 0.30%.
5.What are the mechanical properties of Q235B steel?
Answer: Mechanical properties of Q235B steel: Yield strength ≥ 235 MPa, Tensile strength 375-500 MPa, Elongation ≥ 26%, Impact energy ≥ 27 J at room temperature.
