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Help CenterSteel Coil & Strip & Cold Rolled Coil，SPCC / DC01 / St12 / Q195、SPCD / DC03 / St13、SPCE / DC04 / DC05 / DC06 / 08AL
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1. Product Overview
Cold rolled steel coils are produced by pickled hot rolled coils as raw material, multi-pass cold rolling under room temperature without high-temperature heating. Featuring ultra-precise dimensional tolerance, smooth bright surface and uniform thin thickness, annealed CR coils own excellent ductility for stamping, bending and painting. They are key raw materials for home appliances, automobiles, hardware, coating substrates and precision machinery shells.
Compared with hot rolled coils, cold rolled coils have no black oxide scale, tighter tolerance, flat bright surface and ultra-thin gauges. Two main delivery states: annealed soft coil (for stamping) and hard cold rolled coil (for high-strength structural parts).
Main Implementation Standards
Chinese National StandardsGB/T 708 Dimensions, shape, weight and tolerance of cold rolled steel sheets and stripsGB/T 13237 Cold rolled quality carbon structural steel sheets and strips
International Export StandardsJIS G3141 (SPCC/SPCD/SPCE)EN 10130 (DC01/DC03/DC04/DC05/DC06)ASTM A1008 / A1011
Supporting Test StandardsGB/T 228 Tensile test, GB/T 230 Hardness test, GB/T 247 Packaging & marking specification
2. Main Steel Grades & Application Scenarios
2.1 General Stamping Low Carbon Steel (Most Widely Used)
SPCC / DC01 / St12 / Q195
Application: General housings, cabinets, hardware accessories, storage racks, ventilation pipes, painted components
Performance: Suitable for ordinary stamping, moderate elongation, cost-effective
SPCD / DC03 / St13
Application: Medium deep drawing parts, home appliance shells, common auto panels, distribution boxes
Performance: Better elongation, less cracking during stamping
SPCE / DC04 / DC05 / DC06 / 08AL Deep Drawing Steel
Application: Ultra-deep complex drawing parts, auto interior components, fuel tanks, washing machine inner barrels, precision stretched shells
Performance: Low yield strength, high r-value, excellent anti-cracking performance for complex curved forming
2. Hard Cold Rolled Coils (Non-annealed)
Grades: SPHC-CR, Q235 Hard CR
Working condition: High-rigidity structural parts without bending, heat treatment required after stamping
Performance: High hardness & yield strength, poor formability, only for simple bending
2.3 Low Alloy High Strength Cold Rolled Coils
Grades: Q355, HC340LA, HC420LA
Application: Auto structural parts, chassis reinforcements, heavy equipment shells
Performance: High strength & lightweight, excellent impact resistance & load capacity
3. Specification Parameters
Thickness Range: 0.2mm ~ 4.0mm; regular stock 0.3–2.5mm
Width Range: 600mm ~ 1800mm, customized slitting narrow strips available
Coil Inner Diameter: Standard 508mm (20 inch) / 610mm (24 inch)
Single Coil Weight: 3–10 tons, small coils customizable
Dimensional Tolerance (Core Advantage of CR Coils)
Thickness tolerance: ±0.02～±0.05mm, much tighter than HR coils
Width tolerance: 0 ~ +3mm
Flatness & camber strictly comply with high-precision GB/T708 standard
Surface Quality GradeFB Finished Bright, FC Finished Clear, FD Finished Distinct; free of scratches, pits and oxidation spots
4. Complete Production Process
Pickling Substrate: Remove all oxide scale from hot rolled coils for clean rust-free surface
Room-temperature Cold Rolling: Continuous multi-stand cold rolling to target ultra-thin gauge, improve surface smoothness
Bell Annealing (Mandatory for Soft Coils): Low-temperature annealing to eliminate work hardening and restore ductility & stamping performance
Skin Pass Temper Rolling: Optimize flatness, control surface roughness and eliminate yield lines
Edge Trimming & Slitting: Remove rough edges, cut into customized widths as requested
Anti-rust Oil Coating: Uniform stamping oil applied to prevent rust during storage & shipment
Full Inspection, Mark Spraying, Packing & Warehousing
5. Mandatory Factory Inspection Items
Spectral chemical composition test: Strict control of low C/Mn/S/P content; Alt aluminum content tested for Al-killed deep drawing steel
Mechanical property test: Yield strength, tensile strength, elongation, n-value & r-value (for deep drawing), hardness
Formability test: 180° cold bending test, Erichsen cupping test to verify stamping performance
Full dimensional inspection: Random check of thickness, width, coil weight, flatness and camber per coil
Surface visual inspection: Grade screening for scratches, pits, roll marks, rust spots and oil stains
6. Main Application Fields
Home Appliance Industry: Shells & inner tanks for refrigerators, washing machines, air conditioners, microwave ovens
Automobile Manufacturing: Body panels, interior stamping parts, fuel tanks, lightweight chassis components
Precision Hardware: Distribution boxes, cabinets, racks, locks & stamped hardware
Coating Substrate: Base material for galvanized, galvalume and color coated coils
Machinery Equipment: Instrument housings, fan pipelines, thin-shell structural parts for construction machinery
Furniture & Kitchenware: Metal cabinets, steel furniture, thin-wall decorative components
7. Core Product Advantages
Ultra-thin & High Precision: Micron-level thickness tolerance, uniform gauge for consistent forming
Smooth Bright Surface: No hot rolling scale, directly ready for painting & electroplating without polishing
Excellent Stamping Performance: High elongation of annealed soft coils, no cracking for complex deep drawing
Superior Flatness: Free of warpage & waves, low waste during post-processing
Optional Surface Grades: FD mirror surface with zero defects for high-end home appliances
Wide Compatibility for Deep Processing: Direct bending, welding, painting, electroplating and stamping available
8. Delivery, Packing & Logistics
Delivery States
Annealed Soft Coil (Mainstream): For stamping, coated with anti-rust oil
Hard Cold Rolled Coil: High rigidity, for structural parts with few bending processes
Surface Treatment: Uniform stamping anti-rust oil; oil-free delivery upon request
Coil Marking: Each coil sprayed with grade, standard, dimension, coil weight, heat batch number and surface grade
Packing Standard: Inner moisture-proof anti-rust paper + plastic film, cross binding with steel strips; plastic guard rings for coil inner holes. Reinforced heavy-duty packing for sea shipment against moisture
Delivery Lead TimeRegular in-stock specifications: Delivery within 3–7 days; customized ultra-thin gauge & ultra-deep drawing DC06/08AL coils: 7–10 days, container loading available from Tianjin Port for export
Attached Shipping Documents: Original Mill Test Certificate (MTC), mechanical performance report, dimension inspection sheet, surface grade inspection record
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