Are there differences in mechanical properties between SPCC sheets of different thicknesses?

Q: Are there differences in mechanical properties between SPCC sheets of different thicknesses?
A: There are slight differences. Thin gauges (0.3-1.0mm) have slightly higher yield strength and hardness due to higher cold rolling reductions, resulting in finer grains (e.g., 0.5mm thick sheet has a yield strength of 260-290 MPa). Thick gauges (2.0-3.0mm) have lower reductions, yield strengths of 230-260 MPa, and slightly higher elongation.
Q: What are the surface finishes of SPCC sheets? How can they be distinguished?
A: According to JIS/GB standards, there are three main categories: ① SPCC-SD (matte surface): Cold-rolled without skin pass, resulting in a dark gray surface suitable for subsequent painting and powder coating; ② SPCC-SB (glossy surface): Skin pass rolled, resulting in a slightly glossy surface suitable for simple exterior applications; ③ SPCC-PC (passivated surface): Coated with a passivation film, offering superior rust resistance compared to SD/SB, suitable for exposed applications. Q: What is the surface roughness standard for SPCC sheet?
A: The surface roughness for matte (SD) is Ra 1.6-3.2μm, and for glossy (SB) is Ra 0.8-1.6μm. This can be adjusted based on customer requirements. For higher finishes (e.g., Ra ≤ 0.4μm), additional polishing is required.
Q: What is the common thickness range for SPCC sheet? Are there ultra-thin/extra-thick specifications?
A: The conventional thickness range of 0.3-3.0mm is the most widely used. Ultra-thin specifications can reach 0.12mm (customization required) for precision hardware. Ultra-thick specifications can reach 6.0mm (classified as thick plate). However, due to the limitations of the cold rolling process, hot-rolled sheet is recommended for thicknesses above 6.0mm.
Q: What are the width and length specifications for SPCC sheet? Are customizations available?
A: Conventional widths are 1000mm, 1250mm, and 1500mm (coiled), and lengths can be cut to customer requirements (e.g., 1000×2000mm, 1250×2500mm flat sheets). Customized widths (e.g., within 300-1500mm) and lengths are available, with a minimum custom width of 100mm or greater. Minimum order quantity (usually 5 tons or more) must be met.