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Help CenterSteel Coil & Strip & Cold Rolled Steel Coil，GB/T 708、GB/T 11253、GB/T 20564、JIS G3141、JIS G3101、ASTM A1008、ASTM A366、EN 10130、EN 10088
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Cold-Rolled Steel Coil - Product Description
Cold-rolled steel coil (CRC) is manufactured using hot-rolled steel coil as raw material. The production processes include pickling to remove scale, cold continuous rolling at room temperature, annealing and finishing. Featuring smooth surface, high dimensional accuracy, excellent strength and good stamping performance, it is widely applied in automobile, home appliance, construction, electronics and other industries.
1. Production Process
Hot-rolled steel coil → Pickling (descaling) → Cold continuous rolling (thickness reduction at room temperature) → Annealing (ductility recovery) → Finishing (temper rolling, slitting, inspection) → Finished coil
Hard rolled coil (unannealed): High hardness (HRB＞90) and poor ductility, only for simple bending. It is commonly used as substrate for galvanized and galvalume steel.
Annealed coil (finished product): Processed with batch annealing or continuous annealing to restore ductility, suitable for stamping and deep drawing.
2. Main Specifications & Parameters
2.1 Dimension Range
Thickness: 0.15–3.0 mm (Common: 0.2–2.0 mm)
Width: 600–1500 mm (Customizable; Regular sizes: 750/1000/1250/1500 mm)
Inner diameter: 508 mm (20 inch) / 610 mm (24 inch)
Coil weight: 3–20 tons (Regular: 5–10 tons)
Thickness tolerance: ±0.02–±0.05 mm, much higher precision than hot-rolled products
2.2 Common Grades (GB / JIS / EN Standards)
Commercial quality: SPCC, DC01, ST12, Q195/Q235
Drawing quality: SPCD, DC03, ST13, 08AL
Deep drawing quality: SPCE, DC04, ST14
Extra deep drawing quality: SPCEN, DC05/DC06, ST15/ST16 (IF steel)
High strength steel: Dual-phase steel (DP), Transformation Induced Plasticity steel (TRIP), Interstitial-Free steel (IF)
2.3 Typical Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Application |
|---|---|---|---|---|
| DC01 | ≤280 | 270–410 | ≥28 | Simple forming, outer casings |
| DC03 | ≤240 | 270–390 | ≥34 | General stamping, home appliances |
| DC04 | ≤210 | 270–370 | ≥38 | Deep drawing, automotive inner panels |
| DC06 | ≤180 | 270–350 | ≥42 | Extra deep drawing, complex components |
2.4 Surface Quality
Surface class: FA (Ordinary), FB (Good), FC (High-grade), FD (Superior)
Surface finish: Bright finish (Ra≤0.8μm), Matt finish (Ra 1.0–2.0μm); Oil-free / Oiled (anti-rust treatment)
Surface features: Free of scale, scratches and rust, ideal for electroplating, painting and enamelling.
3. Applicable Standards
Chinese Standard (GB): GB/T 708, GB/T 11253, GB/T 20564
Japanese Standard (JIS): JIS G3141, JIS G3101
American Standard (ASTM): ASTM A1008, ASTM A366
European Standard (EN): EN 10130, EN 10088
4. Product Advantages
High dimensional accuracy with tight tolerance and good flatness, fit for precision stamping.
Excellent surface quality without oxide scale, directly available for surface treatment.
Stable mechanical properties with well-matched strength, ductility and toughness to meet various forming requirements.
Uniform material and compact internal structure, free of inclusion and lamination, with superior processability.
5. Application Fields
Automotive Industry: Inner & outer body panels, doors, hoods, wheel hubs, seat components (DC04/DC06, DP steel)
Home Appliance Industry: Casings of refrigerators, air conditioners, washing machine tubs, microwave panels and small household appliance parts (SPCC/DC01/DC03)
Construction & Decoration: Suspended ceilings, partition walls, ventilation ducts, furniture panels, security doors, elevator panels
Electrical & Electronic Industry: Motor cores, electrical enclosures, battery shells, precision stamped parts
Others: Enamel products, substrate for galvanized/galvalume steel, stationery and hardware tools
6. Packaging & Delivery
Packaging: Horizontal packing with inner anti-rust paper and plastic film, reinforced with steel angle protectors and steel straps. Export seaworthy packaging is adopted.
Marking: Coil number, dimension, grade, weight, production date, standard number and manufacturer information.
Lead Time: 7–15 days for in-stock goods; 15–30 days for customized products.
7. Storage & Transportation
Storage: Keep in dry, ventilated and rainproof warehouse. Place on flat supports to avoid deformation. Recommended storage period: within 6 months.
Transportation: Keep goods away from rain and moisture. Fix coils firmly to prevent collision and surface scratches.
8. Remarks
Custom specifications, special surface treatments and customized mechanical properties are acceptable.
Material Test Certificate (MTC) is provided, including chemical composition, mechanical properties, surface quality and dimensional deviation.
Deep processing services such as slitting, leveling, stamping, bending and welding are available.
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