Overview
Cold rolled steel sheet (4 feet width) is produced by further processing hot-rolled steel through cold reduction mills at room temperature. This process enhances surface quality, dimensional precision, and mechanical properties like yield strength. The 4-foot (1.2m) width is a standard size for industrial fabrication, balancing handling ease and material efficiency. Unlike hot-rolled steel, cold rolling eliminates scale and improves surface smoothness (Ra < 1.3μm), making it ideal for applications requiring paint adhesion or aesthetic appeal. Common grades include SPCC (JIS), ASTM A1008, and DC01 (EN), with thicknesses ranging from 0.3mm to 3mm.
Structure and Working Principle
Cold rolling involves passing hot-rolled coils through a series of tandem mills under high pressure, reducing thickness by 50-90%. The process induces work hardening, increasing tensile strength by 20-30% compared to hot-rolled equivalents. Annealing may follow to restore ductility. The 4-foot width is achieved through precision slitting of master coils. Edge conditioning ensures burr-free cuts, critical for stamping operations. Microstructure refinement during cold rolling produces elongated grains aligned parallel to the rolling direction, enhancing longitudinal strength.
Key Features
1. **Surface Quality**: Matte or shiny finishes with roughness control (0.5-1.5μm Ra) for coating/painting. 2. **Tolerance**: Thickness variance as tight as ±0.03mm for precision parts. 3. **Formability**: Minimum 30% elongation (ASTM A1008) for deep drawing. 4. **Flatness**: Typically <3 I-units/mm for laser cutting applications. Additional treatments include oiling (ISO 11124 compliant) for rust prevention or skin-pass rolling to improve stamping performance. Electrogalvanized versions combine corrosion resistance with cold-rolled benefits.
Application Areas
1. **Automotive**: Body panels, chassis components (thickness 0.7-1.2mm). 2. **Appliances**: Refrigerator doors, washing machine drums (0.5-1.5mm). 3. **Construction**: Metal roofing, partition walls (0.4-2.0mm). 4. **Electronics**: Enclosures, battery casings (0.3-1.0mm). Specialized uses include electrical transformer cores (non-oriented grades) and food packaging (tinplate substrates). The 4-foot width suits CNC plasma cutting beds and medium-sized press brakes.
Maintenance and Precautions
Store horizontally on wooden pallets in dry warehouses (RH <60%). Use VCI (Volatile Corrosion Inhibitor) paper for long-term storage. Remove mill oil with alkaline cleaners before welding/painting. Avoid stacking over 3m high to prevent edge damage. For laser cutting, ensure proper assist gas pressure to minimize dross. Regularly calibrate straighteners to maintain flatness during processing.
B2B Procurement Guide
1. **Specifications**: Define thickness tolerance, width (1220mm ±2mm), and edge type (mill edge/slit edge). 2. **Certification**: Require mill test reports for yield strength (140-280MPa typical). 3. **MOQ**: Standard orders are 5-20 tons; small batches may attract 10-15% premiums. 4. **Lead Time**: 2-4 weeks for domestic procurement; 6-8 weeks for imports. Consider coil (for continuous processing) or cut-to-length sheets. Verify packaging (waterproof wrapping with steel strapping). Major producers include Baosteel, POSCO, and Nucor.
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