What are the hardness value ranges corresponding to different hardness grades of SPCC coils?
Answer: 1/8 Hard (8) HRB 50 - 71, HV 95 - 130; 1/4 Hard (4) HRB 65 - 80, HV 115 - 150; 1/2 Hard (2) HRB 74 - 89, HV 135 - 185; Hard (1) HRB≥85, HV≥170.
Why is HRB sometimes used and HV sometimes used for SPCC coil hardness testing?
Answer: HRB is used when there is no special specification; when the steel plate thickness is too thin to be measured using HRB, it will be measured according to HR30T, HR15T or HV.
Are "hard" and "hard-rolled coil" the same thing for SPCC coils?
Answer: No. The suffix "1" indicates "hard" SPCC coils, which still require low-temperature annealing; while hard-rolled coils typically do not undergo complete annealing, resulting in differences in processing and performance.
In which fields are SPCC coils mainly used?
A: Widely used in automotive body panels, interior parts, refrigerator and washing machine casings, electronic equipment structural components, building decorative panels, and various hardware products.
What deep processing can SPCC coils undergo as a substrate?
A: They can be processed into high-value-added products such as electro-galvanized sheets, hot-dip galvanized sheets, fingerprint-resistant electro-galvanized sheets, color-coated steel coils, vibration-damping composite steel sheets, and PVC-coated steel sheets.