What are the main mechanical properties of cold-rolled steel sheets?
Key properties: Yield strength (σs), tensile strength (σb), elongation (δ), hardness (HB). For example, the yield strength of SPCC cold-rolled steel sheets is approximately 130-300 MPa, and the elongation is ≥28%.
What are the advantages of the dimensional accuracy of cold-rolled steel sheets?
Thickness tolerance: Ordinary cold-rolled steel sheets ±0.05-0.10 mm, high-precision cold-rolled steel sheets ±0.02-0.03 mm; width tolerance ±2-5 mm, length tolerance ±3-10 mm, far exceeding the dimensional accuracy of hot-rolled steel sheets.
What is the typical surface roughness Ra value of cold-rolled steel sheets?
Conventional cold-rolled steel sheets Ra=0.3-1.5 μm, which can be adjusted according to requirements: stamping sheets Ra=0.5-1.0 μm (for easier lubrication during forming), coating sheets Ra=0.8-1.2 μm (to improve coating adhesion).
How is the corrosion resistance of cold-rolled steel sheets?
Untreated cold-rolled steel sheets have poor corrosion resistance and are prone to rust, requiring subsequent treatments (such as galvanizing, painting, and phosphating) to improve their corrosion resistance. Stainless steel cold-rolled sheets (such as 304) inherently possess good corrosion resistance.
What are the differences in application scenarios for cold-rolled steel sheets of different thicknesses?
0.1-0.5mm: Electronic components, battery casings, precision instrument housings;
0.5-1.5mm: Appliance panels, automotive interior parts, stamped parts;
1.5-3.0mm: Automotive structural parts, machinery housings, shelves, kitchenware.