Q: What is the typical chemical composition range of SPCC?
A: C≤0.12%; Si≤0.05%; Mn≤0.50%; P≤0.035%; S≤0.035%; Al≥0.02% (aluminum-killed steel).
Q: What are the conventional mechanical properties of SPCC?
A: Tensile strength 270–410 MPa; Yield strength ≥180 MPa; Elongation after fracture ≥34% (slightly varies depending on thickness).
Q: What is the hardness range of SPCC?
A: Annealed state HRB 60–80; 1/8 hard approximately HRB 85–95; 1/4 hard approximately HRB 95–105; 1/2 hard approximately HRB 105–115; Hard approximately HRB 115–125.
Q: What are the plastic strain ratio r and work hardening index n values of SPCC?
A: r value is approximately 1.4–2.0; n value is approximately 0.18–0.25, affecting stamping formability.
Q: Which domestic grades are equivalent to SPCC?
A: Equivalent to Q195 and Q215A; corresponds to German St12 and EU DC01.