Commercial Quality Cold Rolled Steel Sheet
Commercial quality cold rolled steel sheet is precision-manufactured through multi-stage room-temperature reduction, delivering tight gauge tolerances, smooth profiles, and uniform mechanical properties for general forming and stamping. Controlled annealing and temper rolling eliminate yield-point elongation to prevent stretcher strains during press-brake bending, providing an optimal substrate for subsequent coating or painting.
Technical Specifications
|
Parameter |
Specification Details |
|
Thickness Range |
0.30 mm to 3.00 mm (Precision gauge control) |
|
Width & Length |
Width: 900 mm to 1600 mm; custom slit & cut-to-length |
|
Standard Grades |
ASTM A1008 (CS Type A/B/C), EN 10130 (DC01 to DC04), JIS G 3141 (SPCC/SPCD) |
|
Edge Condition |
Mill edge or trimmed edge |
Mechanical Performance
|
Property |
Standard Threshold |
Formability Implication |
|
Yield Strength |
Max 270 MPa |
Ensures low resistance during initial press forming |
|
Tensile Strength |
270 to 410 MPa |
Balances structural rigidity with press adaptability |
|
Elongation |
Min 30 percent (50 mm gauge) |
Permits moderate bending and simple drawing without cracking |
|
Hardness |
Max 65 HRB |
Facilitates clean punching, shearing, and machining |
Surface Characteristics
|
Feature |
Specification |
Functional Benefit |
|
Finish Type |
Bright (Ra under 0.8 micrometer) / Dull Matte |
Bright for paint adhesion; matte for lubricant retention |
|
Oiling Status |
Rust-preventative oil (1.0 to 2.0 grams per square meter) |
Prevents atmospheric oxidation during ocean transit |
|
Defect Control |
Optical surface inspection |
Eliminates laminations, pinholes, and edge cracks |
Typical Industrial Applications
Automotive Components: Internal structural brackets, seat reinforcement panels, and non-exposed pressings.
Home Appliances: Outer panels for refrigerators, washing machine drums, and air conditioner housings.
Electrical Enclosures: Distribution boxes, server racks, control cabinets, and lighting fixture bodies.
General Hardware: Stamped metal clips, furniture components, shelving brackets, and light industrial parts.
Manufacturing Quality Control
Gauge Verification: Continuous X-ray thickness monitoring combined with manual micrometer checks at coil ends.
Destructive Testing: Universal tensile and elongation testing executed on every master coil per ASTM and ISO standards.
Metallurgical Evaluation: Grain size analysis and surface roughness profiling ensuring consistent stamping performance.
Traceability System: Permanent heat numbers and barcoded tags linking each bundle to raw material test reports.
Customization Capabilities
Precision Tolerances: Special rolling capabilities achieving plus or minus 0.02 mm gauge deviation for clearance-critical assemblies.
Temper Adjustment: Tailored temper rolling reduction ratios to match specific customer hardness requirements.
Dimensional Blanking: Precise cut-to-length sheet dimensions minimizing scrap rates during downstream blanking.
Surface Protection: Adjustable rust-preventative oil weights or specialized temporary protective films upon request.
Packaging & Export Delivery
Multi-Layer Wrapping: Moisture-proof plastic film, neutral kraft paper, and corrugated edge protectors combined with external steel sheet shielding.
Secure Palletizing: High-tensile steel banding securing material onto heavy-duty wooden skids or fumigation-free pallets.
Handling Optimization: Standardized bundle weights designed for overhead crane lifting and safe forklift unloading at manufacturing sites.
Frequently Asked Questions
Q: What differentiates commercial quality from drawing quality cold rolled steel?
A: Commercial quality is engineered for general bending and simple forming where deep drawing stress is minimal, whereas drawing quality features lower carbon levels to withstand severe plastic deformation without tearing.
Q: How is the surface oil removed prior to painting?
A: The light rust-preventative oil film is removed efficiently using standard alkaline degreasing baths or solvent wipe stations within customer pretreatment lines.
Q: What is the minimum order quantity for custom specifications?
A: Minimum quantities are based on master coil scheduling, typically starting at 5 metric tons per specification to ensure production efficiency.
Q: Are material test certificates provided with shipments?
A: Comprehensive EN 10204 3.1 inspection certificates detailing chemical composition and actual mechanical test data are issued for every delivered batch.
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