What are the specific hardness values for SPCC sheets?
A: 1/8 Hard: HRB 50-71, HV 95-130; 1/4 Hard: HRB 65-80, HV 115-150; 1/2 Hard: HRB 74-89, HV 135-185; Hard: HRB≥85, HV≥170; Annealed: HRB 85-110.
What are the different surface finishes for SPCC sheets?
A: They are classified as matte (D) and glossy (B). A matte finish is achieved by shot peening the rolls after grinding, while a glossy finish is achieved by precision grinding the rolls.
What are the surface quality grades for SPCC sheets?
A: These include FB (higher-grade finished surface) and FD (ultra-high-grade finished surface), etc. FB allows for minor defects that do not affect forming and coating adhesion; FD is preferable, with one side free of any defects affecting the coating appearance, and the other side at least meeting FB standards.
Is SPCC sheet prone to rust?
A: Yes, it is prone to rust. Because it is low-carbon cold-rolled steel with no protective layer, it is easily oxidized and rusted when exposed to humid environments, usually requiring surface treatments such as electroplating or spraying.
Is SPCC sheet suitable for stamping?
A: Yes. It has a low carbon content, good plasticity and formability, but excessive manganese content or improper hot rolling processes can lead to reduced elongation, making it prone to cracking during stamping.