What specifications and surface finishes are typically chosen for SPCC boards used in the home appliance industry?

Q: What specifications and surface finishes are typically chosen for SPCC boards used in the home appliance industry?
A: SPCC boards for home appliances: Thickness: 0.5-1.5mm, with a surface finish of SPCC-SD (for ease of painting) or SPCC-PC (for improved rust resistance). For example, 1.2mm thick SD grade is used for washing machine bases, and 1.5mm thick PC grade is used for air conditioner brackets.
Q: Why not choose SPCC or SPCE for hardware?
A: Because most hardware requires simple stamping/bending (such as brackets and gaskets), high formability is not required. SPCC's performance meets these requirements, and its price is lower than SPCD (10%-15% higher) and SPCE (20%-25% higher), reducing costs.
Q: Can SPCC boards be used outdoors? What precautions should be taken?
A: Long-term exposed outdoor use is not recommended (rust resistance is poor and rust is likely to occur). If use is necessary, enhanced anti-rust treatment (such as hot-dip galvanizing and painting) is required, and regular maintenance (repainting every 1-2 years) is required. For short-term outdoor use (such as temporary billboards), a thick layer of anti-rust oil can be applied to protect from rain.
Q: What specific components are SPCC sheets used for in the automotive industry? Why not high-strength steel?
A: They are used for "non-safety, non-load-bearing" components, such as door trim brackets, seat adjustment brackets, and small trunk accessories. These components do not require high strength (such as collision protection and load-bearing properties), and SPCC offers a better balance between strength and cost. High-strength steel (such as Q345 and HC340LA) is mostly used for safety components such as chassis and anti-collision beams.
Q: When purchasing SPCC sheets, what parameters should I provide to the supplier? A: Five core parameters must be specified: ① Thickness (e.g., 1.0mm, including tolerance requirements); ② Width × Length (e.g., 1250×2500mm flat plate, or 1250mm wide coil); ③ Surface condition (SD/SB/PC); ④ Mechanical property requirements (e.g., yield strength ≤ 280MPa, elongation ≥ 30%); ⑤ Surface quality (e.g., "no scratches, no rust").