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Help CenterSteel Coil & Strip & Cold Rolled Steel Coil，JIS G3141、EN 10130、ASTM A1008、DIN 1623
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1. Product Overview
Cold Rolled Coil (CRC) is produced from pickled hot rolled coils. It is rolled to target thickness at room temperature below recrystallization temperature, followed by batch/continuous annealing, skin-pass leveling, anti-rust oil coating and coiling. Without high-temperature hot rolling process, it eliminates hot rolled black oxide scale completely, featuring smooth surface, ultra-high dimensional accuracy and excellent stamping performance. It acts as core raw material for home appliances, automotive spare parts, hardware stamping, substrate for galvanized & color coated steel, and precision equipment shells.
Cold Rolling Forming Principle
Hot rolled black coils are pickled to remove oxide scale first, then heavily reduced by multi-stand cold rolling mills at ambient temperature. Cold processing causes work hardening, which is eliminated by annealing to restore steel plasticity and toughness. Afterwards, skin-pass mill corrects flatness and controls surface roughness. The finished strip is tension coiled into standard coils, available for leveling, slitting, stamping and painting deep processing directly.
2. Main Steel Grades & Applicable Working Conditions
2.1 Chinese Standard Low Carbon Cold Rolled Grades
08AL, Q195, Q215, Q235
08AL: Ultra-low carbon grade with outstanding deep drawing performance, specially for auto exterior parts and home appliance shells
Q235: General grade for bending, simple stamping, cabinets and hardware fittings
2.2 JIS Standard Stamping Series
SPCC (Commercial Grade), SPCD (Drawing Grade), SPCE (Deep Drawing Grade), SPCG (Extra Deep Drawing IF Steel)
SPCC: Distribution boxes, storage racks, equipment cases and simple hardware
SPCD: Automotive chassis parts, car roofs and interior stamped components
SPCE/SPCG: Auto body panels, refrigerator & washing machine shells, complex drawn housings
2.3 European EN Standard Series
DC01 (Commercial), DC03 (Drawing), DC04 (Deep Drawing), DC05/DC06 (Extra Deep Drawing IF Interstitial Free Steel)
2.4 High Strength Cold Rolled Auto Steel (Heavy Load Structural Parts)
H180YD, H220YD, HC260LA, DP590, DP780 Dual Phase Steel, used for auto structural beams, anti-collision parts and load-bearing brackets
3. Applicable Standard System
Domestic Chinese Standards
GB/T 708 Dimensions, shape, mass and tolerances of cold rolled steel sheets and stripsGB/T 5213-2019 Cold rolled low carbon steel sheets and stripsGB/T 11253 Cold rolled carbon structural steel stripsGB/T 20564 High strength cold rolled steel sheets and strips for automobile
International Export Standards
JIS G3141, EN 10130, ASTM A1008, DIN 1623
4. Complete Specification Parameters
Thickness Range: 0.2mm–4.0mm; regular stock 0.3–2.5mm, customized ultra-thin 0.2–0.6mm & heavy gauge 2.5–4.0mm available
Standard Width: 600mm, 900mm, 1000mm, 1250mm, 1500mm, 1800mm, 2000mm, custom narrow slitted strips supported
Standard Inner Diameter: 508mm (20 inch), 610mm (24 inch)
Single Coil Weight: Regular 5–22 tons, split small coils 3–8 tons on request
Surface Delivery Types
Bright Annealed & Oiled (Mainstream): Mirror smooth surface with anti-rust oil, ready for stamping and painting
Black Annealed (CRBA): Cost-effective with thin oxide film, for simple structural parts
Non-oiled Cold Rolled Coil: For customer subsequent phosphating & electroplating
Hardness Delivery GradesFull soft annealed (1/8 hard), 1/4 hard, 1/2 hard, full hard (non-annealed high hardness)
Further Processing FormsWhole coil, leveled cold rolled sheets, slitted narrow strips, cut-to-size plates
Dimensional Accuracy Control
Thickness tolerance ±0.01~±0.05mm; width tolerance 0~+5mm; strict control on flatness, camber and coil telescoping, far superior to hot rolled coils in precision.
5. Complete Production Process
Incoming hot rolled coils → Continuous pickling & descaling → Multi-stand cold rolling reduction → Batch / continuous annealing to eliminate work hardening → Skin-pass finishing for roughness control → Anti-rust oil coating → Tension coiling → Coil marking & coding → Cooling & aging → Full appearance & dimensional inspection → Strapping & warehousing
6. Mandatory Batch Inspection Standards (Sampling Test Per Batch)
6.1 Mechanical Property Tests
Tensile test: Yield strength, tensile strength, elongation after fracture to distinguish commercial/drawing/deep drawing grades
180° cold bend test: No cracks or lamination, suitable for bending forming
Erichsen cupping test: Evaluate deep drawing capacity for deep drawing grades
Hardness test: HV/HRB to identify soft, half-hard and full-hard delivery status
Spectrochemical analysis: Strict control over C, S, P impurities; low carbon & sulfur for deep drawing steel
6.2 Appearance & Dimensional Inspection
Smooth surface free of oxide scale, scratches, indentations, roll marks and slivers; flat coil shape without severe telescoping or loose winding; thickness, width and coil weight checked and recorded coil by coil.
6.3 Surface Roughness Test
Ra 0.6–1.6mm adjustable to match painting, electroplating and film lamination processes.
7. Core Product Advantages
Ultra-high dimensional accuracy, minimal machining allowanceCold forming at room temperature ensures thickness tolerance within 0.02mm, stable size of stamped parts, reducing grinding and trimming procedures.
Mirror clean surface without secondary polishingFree of hot rolling oxide scale, uniform and delicate plate surface with strong paint adhesion after spraying & electroplating for premium finished appearance.
Graded stamping performance for complex formingCovers applications from simple bending to ultra-deep drawing; IF steel forms complex housings without cracking, ideal for high-end auto & home appliance exterior panels.
Optional hardness balancing formability & strengthSoft grade for stamping; half-hard & full-hard grades directly for load-bearing structural parts without extra heat treatment.
Excellent compatibility for deep processingDirectly available for leveling, slitting, stamping, bending, welding, painting, hot-dip galvanizing and color coating, the preferred substrate for all coated steel products.
Flat plate surface with high finished product yieldSkin-pass process eliminates internal stress to avoid wrinkling & warping during stamping, drastically lowering production scrap rate.
8. Main Application Fields
Home Appliance Industry (Core Application)Refrigerator, washing machine, air conditioner, TV shells, cabinets, inner liners, internal support frames, microwave housings
Automobile Manufacturing IndustryAuto doors, hoods, roofs, fenders, chassis stamped parts, interior panels, seat brackets, high-strength anti-collision structural components
Hardware Stamping ProductsElectric distribution cabinets, office cabinets, storage racks, tool boxes, metal furniture, door blank sheets, various stamped hardware fittings
Coated Steel Substrate IndustrySubstrate for hot-dip galvanized, electro-galvanized and color coated coils, used for building roof panels and decorative sheets
General Machinery & Precision EquipmentInstrument shells, equipment cabinets, motor housings, small equipment bases, precision sheet metal parts
Rail Transit & ContainersTruck interior panels, auxiliary container materials, small railway structural steel parts
9. Packaging, Loading Port & Lead Time
Standard Export PackagingSteel guard rings fitted on inner and outer coil circles, cross strapping with steel bands for reinforcement; inner layer wrapped with VCI anti-rust film, outer layer covered with blue waterproof woven cloth; paper tube inside coil core to avoid deformation, plastic end guards for collision protection.
Loading Port: Tianjin Port, shipment available via Qingdao Port and Shanghai Port.
Lead Time
Regular stock SPCC & DC01 cold rolled coils: 5–7 days
SPCD/SPCE, DC04/DC06 deep drawing cold rolled coils: 7–12 days
High strength auto cold rolled steel, custom thickness & width: 12–20 days
MOQ & SamplesMinimum order quantity 10 tons; small sample plates provided free for material, tensile and cupping tests.
10. Supporting Quality Assurance Documents
Complete set of original Chinese & English factory certificates:
Heat chemical composition analysis report
Mechanical test report (tensile, bend, cupping)
Dimensional tolerance & surface roughness inspection data sheet
Surface appearance inspection record
GB / JIS / EN factory certificate, packing list, certificate of origin
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