Overview
CR Plate, or Cold Rolled Plate, is produced by cold rolling hot-rolled coils at room temperature, resulting in thinner gauges and enhanced mechanical properties. Unlike hot-rolled steel, the cold-rolling process eliminates scale and improves surface smoothness, making it ideal for applications requiring precision and aesthetics. The absence of heat during rolling minimizes material stress, ensuring consistent thickness and flatness. CR plates are commonly available in thicknesses ranging from 0.3mm to 3mm, with standardized grades like SPCC (JIS) or DC01 (EN). Their versatility spans industries from automotive body panels to household appliances.
Structure and Working Principle
CR plates undergo a multi-step process: hot-rolled coils are first pickled to remove oxides, then rolled through tandem mills under high pressure. This compresses the grain structure, increasing tensile strength (typically 270-500 MPa) while reducing ductility. Annealing may follow to restore flexibility, with skin-pass rolling as a final step to achieve the desired surface texture (e.g., matte or glossy). The absence of temperature-induced warping allows for tighter tolerances (±0.05mm), critical for stamping and deep-drawing operations.
Key Features
Surface Quality: CR plates exhibit Ra surface roughness values as low as 0.4µm, suitable for painting or plating without additional polishing. Mechanical Properties: Higher yield strength (180-350 MPa) compared to hot-rolled steel enables lightweight designs. The material's uniform microstructure ensures consistent performance in CNC machining and welding. Dimensional Stability: Cold rolling eliminates the 'orange peel' effect, providing flatness within 3-5 I-units (ASTM A568), crucial for laser cutting and precision assembly.
Application Areas
Automotive: Body panels, chassis components, and fuel tanks leverage CR plates' formability and corrosion resistance (often with galvanization). Construction: Used for metal roofing, HVAC ducts, and modular structures due to weather resistance and ease of fabrication. Consumer Goods: Appliance exteriors (refrigerators, washing machines) benefit from the smooth finish, while electronics employ CR plates for shielding and brackets.
Maintenance and Precautions
Storage: Stack horizontally in dry environments with desiccants to prevent rust. Use edge protectors during handling to avoid burrs. Fabrication: Degrease surfaces before welding or adhesive bonding. For laser cutting, optimize gas pressure to minimize slag adhesion on the underside. Corrosion Protection: Uncoated CR plates require prompt application of primers or powder coatings. Electrogalvanized versions (e.g., SECC) offer extended outdoor durability.
B2B Procurement Guide
1. Specifications: Clearly define thickness tolerance (e.g., ±0.03mm), width (standard: 1,000-1,250mm), and edge condition (mill edge or slit). 2. Certifications: Require mill test reports (MTRs) confirming EN 10130 or ASTM A1008 compliance. For automotive use, PPAP documentation may be necessary. 3. Logistics: Opt for coil (CR coil) if high-volume stamping is planned, or pre-cut sheets for small batches. Consolidate orders to minimize freight costs per unit.
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