Q: What are the surface treatment types for SPCC?
A: Bare sheet (untreated), oiling for rust prevention, passivation, phosphating, electro-galvanizing (SECC), hot-dip galvanizing (SGCC), etc., to improve corrosion resistance or adapt to subsequent processing.
Q: What processing techniques are suitable for SPCC?
A: Suitable for stamping, bending, stretching, shearing, punching, etc. Annealed state is suitable for complex forming, while hardened state is suitable for structural parts requiring a certain strength.
Q: What are the bending limits of SPCC?
A: Annealed state can achieve 180° crack-free bending (mandrel diameter ≈ 6t, t is the sheet thickness). Hardened state requires a larger bending radius to avoid cracking.
Q: How is the weldability of SPCC?
A: Its low carbon content makes it highly weldable, suitable for arc welding, resistance welding, and laser welding. Rust prevention treatment is required after welding to prevent weld corrosion.
Q: What problems are common during SPCC stamping and what are the solutions? A: Common problems include cracking, springback, and surface scratches; countermeasures include using annealed state, optimizing die fillet radius, controlling stamping speed, and using special lubricant.