Cold Steel Coil PPGI for Boiler/Boat/Container Board

What causes scratches on the surface of cold-rolled steel?
A: These include surface defects in the raw material, slag sticking to the rolls during rolling, scratches on the finishing equipment, and friction damage during packaging and transportation.
How can oxidation and rusting of cold-rolled steel be prevented?
A: Immediately after production, perform rust-proof treatment (applying anti-rust oil, passivation), use moisture-proof packaging, and store in a dry, ventilated environment to avoid contact with corrosive substances.
What causes the "wavy" shape defect in cold-rolled steel?
A: This is primarily due to uneven pressure during rolling, uneven annealing temperature distribution, or improper adjustment of the skin-pass mill, which leads to an imbalance in the internal stress distribution of the sheet.
What are the solutions for cracking during stamping of cold-rolled steel?
A: Select a material with higher elongation, optimize the stamping die design, reduce the stamping speed, and pre-anneal the sheet to eliminate internal stress.
How can dimensional tolerances of cold-rolled steel be controlled?
A: Optimize rolling process parameters, regularly calibrate the rolling mill equipment, strengthen dimensional inspections during production, and promptly adjust equipment accuracy.