SPCC Cold Rolled Steel Sheet
SPCC cold rolled steel sheet is produced from pickled hot rolled coils processed through tandem cold reduction mills to exact target thicknesses, followed by controlled batch annealing and skin-pass rolling to eliminate yield point elongation and optimize formability for precision stamping, deep drawing, and structural fabrication.
Technical Specifications
|
Parameter |
Specification Details |
|
Standard & Grade |
JIS G3141 SPCC (Equivalent: ASTM A1008 CS Type B, EN DC01) |
|
Thickness Range |
0.30 mm to 3.00 mm (plus or minus 0.03 mm tolerance) |
|
Width Range |
600 mm to 1500 mm (slit coils and sheared sheets) |
|
Length Range |
1000 mm to 4000 mm (cut-to-length sheets) |
|
Coil Dimensions |
Inner Diameter: 508 mm or 610 mm |
|
Delivery Condition |
Annealed with skin-pass rolling (8 temper / standard cold-reduced) |
Mechanical Properties
|
Property |
Threshold / Limit |
|
Tensile Strength |
Minimum 270 MPa across standard gauges |
|
Yield Strength |
Maximum 240 MPa for predictable spring-back control |
|
Elongation |
Minimum 32 percent (Gauge Length = 50 mm) for deep drawing |
|
Rockwell Hardness |
50 HRB to 85 HRB (temper dependent) |
Surface Finish
Finish Grades
FB (Normal Finish): Minor defects permitted (small pits, slight scratches, roller marks) within thickness tolerance limits.
FD (Lustrous Finish): Smooth, precision-ground surface designed for exposed parts requiring uniform paint adhesion.
Surface Treatment
Oiled: Coated with anti-rust preventive oil (1.0 to 2.0 grams per square meter per side) for transit protection.
Dry: Un-oiled option available for immediate customer coating lines.
Edge Condition
Mill edge or trimmed slit edge free from burrs; camber restricted to 1.0 mm maximum per 2000 mm length.
Typical Applications
Interior reinforcement brackets, seat frames, oil pan shields, and window regulator housings.
Outer panels and internal structural chassis for refrigerators, washing machines, and microwave ovens.
Control cabinets, junction boxes, server racks, and telecommunication switchgear housings.
Office furniture, shelving units, hinges, stamped clips, and precision metal fasteners.
Quality Control
Raw Material Inspection
Incoming pickled coils verified for chemical composition (Carbon maximum 0.15 percent, Manganese maximum 0.60 percent, Phosphorus maximum 0.050 percent, Sulfur maximum 0.035 percent).
Dimensional Monitoring
Automated thickness gauges installed on rolling lines measuring cross-section profiles continuously.
Mechanical Testing
Tensile testing, Erichsen cupping tests, and Rockwell hardness testing performed on samples from every heat lot per ASTM/JIS standards.
Traceability
Each bundle and coil stamped with heat number, grade, dimensions, and net weight linked directly to verifiable Mill Test Certificates.
Customization Options
Precision Slitting: Narrow-width slit strips supplied down to 20 mm width with tight width tolerance (plus or minus 0.1 mm).
Cut-to-Length Sheets: Custom sheet sizing processed to exact customer blueprints with diagonal squareness tolerance within 1.5 mm.
Protective Interleaving: Paper interleaving or PVC surface protection film applied for scratch-sensitive stamping operations.
Alternative Tempers: Selection available between standard annealed temper, 1/8 hard, 1/4 hard, 1/2 hard, and full hard conditions based on rigidity requirements.
Packaging, Delivery
Export Packaging: Vertical or horizontal eye-to-sky / eye-to-wall coil packaging wrapped in moisture-proof plastic film, heavy-duty waterproof Kraft paper, and galvanized steel corrugated outer wrappers.
Palletization: Cut sheets stacked on fumigation-free wooden pallets, secured with steel strapping bands and edge protectors.
Container Loading: Maximum weight distribution managed for 20GP containers (up to 26 metric tons) with anti-slip timber bracing.
Frequently Asked Questions
Q: What is the difference between SPCC-SD and SPCC-SB?
A: SPCC-SD indicates a dull finish produced by skin-pass rolling with shot-blasted rolls, while SPCC-SB indicates a bright finish produced with polished rolls. SD is preferred for paint adhesion, whereas SB suits electroplating or decorative finishing.
Q: How is anti-rust protection maintained during ocean shipping?
A: Coils and sheets are coated with rust-preventive oil, sealed in moisture-barrier polymer film, and packaged inside corrugated steel wrap to prevent condensation during prolonged maritime transit.
Q: Are Mill Test Certificates provided with every shipment?
A: Yes, complete inspection reports detailing chemical analysis, tensile strength, elongation, and hardness values are issued digitally and shipped with physical documentation.
Q: What is the standard tolerance for sheet length and width?
A: Standard length tolerance is 0 to plus 5 mm, and width tolerance for slit edges is plus or minus 0.15 mm, meeting strict automated feeding requirements.
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