Which is more suitable for deep drawing, SPCD or SPCE coils?
A: SPCE coils are more suitable for deep drawing. SPCE has a lower carbon content (≤0.08%), fewer impurities, a higher stamping grade than SPCD, and can withstand greater deformation, while SPCD is only suitable for medium-depth stamping.
What is the purpose of annealing SPCD coils?
A: Annealing eliminates work hardening and internal stress generated during cold rolling, reduces material hardness, and improves plasticity and toughness, making it less prone to cracking during subsequent stamping, bending, and other processing, while also ensuring dimensional stability.
What thickness tolerance can SPCD coils achieve?
A: The cold rolling process makes its thickness tolerance far superior to hot-rolled coils. The standard tolerance can be controlled within ±0.02 - ±0.05mm. For high-precision applications, the tolerance range can be further reduced through leveling processes.
Can SPCD coils be galvanized?
A: Yes. SPCD has a high surface finish, making it suitable for electro-galvanizing or hot-dip galvanizing. Galvanizing improves its corrosion resistance, and it is often used for stamped parts for outdoor applications, such as small automotive exterior parts and outdoor equipment housings.
What to do if the zinc layer peels off when bending SPCD rolls after galvanizing?
Answer: Increase the inner radius of the bend to reduce stress and cracking of the zinc layer; use a bend-resistant zinc-iron alloy coating; after bending, apply zinc-rich paint to the peeling areas to compensate for the corrosion resistance defects.