Contact Platform Support
Help CenterSteel Coil & Strip & Cold Rolled Steel Coil，GB/T 12754-2019、ASTM A755、EN 10169
Related Products
-
Steel Coil & Strip & Prepainted Galvanized Coil，Z80/Z100/Z120/Z180；AZ100/AZ150；ZM100/ZM150NegotiableMOQ: 5 Metric Tons -
Steel Sheet & Plate & Pressure Vessel Steel Plate，SA516Gr60/65/70、SA285GrC、SA387Gr12/22、SA203E、P265GH、P355GH、P355NL、P460NH、P500QNegotiableMOQ: 5 Metric Tons
-
Steel Sheet & Plate & Shipbuilding Steel Plate，A/B/D/E、AH32、DH32、EH32、AH36、DH36、EH36、AH40、DH40、EH40、FH36、FH40NegotiableMOQ: 5 Metric Tons
-
Steel Sheet & Plate & Boiler Plate，Q245R、Q345R、Q370R、15CrMoR、12Cr1MoVR、13MnNiMoR、14Cr1MoRNegotiableMOQ: 5 Metric Tons
-
Steel Sheet & Plate & Checkered Steel Plate，2.0、2.5、3.0、3.5、4.0、4.5、5.0、6.0、7.0、8.0NegotiableMOQ: 5 Metric Tons
1. Product Overview
Cold Rolled Carbon Steel Coil (abbreviated as CRC) is deep-processed from high-quality hot rolled steel coils through rolling at room temperature (below metal recrystallization temperature). It goes through a full set of procedures including pickling for descaling, cold tandem rolling, batch/continuous annealing, skin pass finishing and anti-rust oil coating.
Different from hot rolled coils, the whole production process involves no high-temperature heating, resulting in surfaces free of oxide scale and pitting defects, ultra-high dimensional tolerance accuracy, as well as excellent stamping, bending and welding performance. It serves as the core basic raw material for home appliances, automobiles, hardware, and substrates of color coated & galvanized steel. Products can be delivered in full coils, or cut into flat cold rolled sheets (cut-to-length sheets) as required.
2. Complete Production Process Flow
Hot rolled raw coil → Pickling (remove oxide scale and rust) → Cold tandem rolling (reduce thickness to target with 40%–80% reduction rate) → Hard cold rolled coil (unannealed, high hardness) → Continuous / Batch annealing (eliminate work hardening and restore ductility & toughness) → Skin pass finishing (correct flatness and control surface roughness) → Slitting to fixed width / Cut-to-length flatting → Anti-rust oil coating → Packaging, Warehousing & Shipment
Classification of Two Types of Finished Products
Annealed Cold Rolled Coil (Main Product for Shipment): Good ductility, available for deep drawing, bending and complex forming; mainstream product purchased on the market
Hard Cold Rolled Coil (CR): Non-annealed, high hardness HRB＞90, only suitable for simple bending, mostly used as substrates for galvanizing mills
3. Applicable Standards & Cross Reference of Main Grades
3.1 General Applicable Standards
Chinese National Standard: GB/T 5213-2019 Cold Rolled Low Carbon Steel Sheets and Strips, GB/T 11253-2019 Cold Rolled Carbon Structural Steel Strips, GB/T 708 (Dimensions, Shape, Weight and Permissible Tolerances)
Japanese Standard: JIS G3141 (SPCC/SPCD/SPCE)
European Standard: EN 10130 (DC01~DC06)
American Standard: ASTM A1008/A1018
3.2 Grade Classification & Application (Stamping Performance from Low to High)
| Stamping Grade | European Grade | Japanese Grade | German St Series | Core Characteristics | Application Scenarios |
|---|---|---|---|---|---|
| General Purpose | DC01 | SPCC | St12 | Basic ductility, simple bending & stamping | Hardware fittings, distribution boxes, ordinary shells, pipe substrates |
| Ordinary Drawing | DC03 | SPCD | St13 | Improved elongation, shallow drawing forming | Small home appliance inner tanks, equipment cases, storage racks, furniture hardware |
| Deep Drawing Grade | DC04 | SPCE | St14 | High elongation, low yield-to-tensile ratio, deep drawing | Automotive outer panels, fuel tanks, kitchenware, complex housings |
| Extra Deep Drawing | DC05 | SPCEN | St15 | IF Interstitial-Free steel, ultimate deep drawing performance | Automobile door panels, instrument panels, complex deep-drawn parts |
| Super Extra Deep Drawing | DC06 | — | St16 | Ultra-low carbon, minimal springback for complex forming | High-end automotive interior & exterior parts, ultra-thin precision stamping components |
3.3 Structural Cold Rolled Grades
Q195, Q235, Q345 with higher strength, mainly used for load-bearing components, supports, vehicle frames and equipment bases.
4. Available Specification Parameters
Thickness: Conventional 0.2mm–2.5mm; Customizable ultra-thin down to 0.06mm, thick up to 4.0mm
Width: 600mm–2000mm, common fixed widths: 1000/1250/1500mm
Inner Coil Diameter: Standard 508mm (20 inch), 610mm (24 inch)
Single Coil Weight: 3–10 tons (small slit coils available upon customer request)
Edge Treatment: Slit edge (precision tolerance) / Mill edge (untrimmed, cost-effective) optional
Surface Roughness: Standard Ra 1.6–3.2μm; Mirror finish for home appliances customized Ra≤1.0μm
5. Core Mechanical Properties (Reference for Annealed DC Series)
| Grade | Yield Strength MPa | Tensile Strength MPa | Elongation A80 ≥ | Plastic Strain Ratio r ≥ |
|---|---|---|---|---|
| DC01 | 140–280 | 270–410 | 28% | — |
| DC03 | 120–210 | 270–350 | 38% | 1.8 |
| DC04 | 120–200 | 270–350 | 40% | 2.0 |
| DC05 | 110–180 | 270–330 | 42% | 2.2 |
| DC06 | 100–160 | 270–320 | 44% | 2.4 |
Chemical Composition (Melting Analysis, Mass Fraction %)
C≤0.02~0.12, Mn≤0.25~0.60, P≤0.020~0.030, S≤0.020~0.030; DC06 extra deep drawing grade adopts Ti/Nb interstitial-free steel with ultra-low carbon content.
6. Core Product Advantages
Excellent Surface QualityFree of hot rolling oxide scale, scabs and pitting. Surfaces are classified into three grades: FB Finished Grade (special for home appliance panels), FC High Finished Grade, FF Super Mirror Finish Grade, free of scratches, pores and roll marks. Direct painting, baking finish and electroplating are available without polishing pretreatment.
Ultra-high Dimensional PrecisionThickness tolerance ±0.02~±0.05mm; width and flatness are strictly controlled, ensuring stable finished stamping dimensions and reducing waste loss.
Superior Forming PerformanceLow-carbon material allows 180° bending without cracking; stable deep drawing without tearing and low springback, compatible with automatic continuous stamping production lines. Excellent weldability for spot welding, MIG welding and TIG welding.
Strong Supporting ExpandabilityCan be used as dedicated substrates for hot-dip galvanizing, electro-galvanizing, color coating and tin plating to support one-stop downstream surface treatment processes.
Stable Storage & TransportationUniform anti-rust oil coated before delivery, packed with standard waterproof & moisture-proof materials, which can prevent rust for 3–6 months during sea container transportation.
7. Industrial Application Fields
Automobile Manufacturing: Car doors, hoods, chassis stamping parts, fuel tanks, seat supports, interior sheet metal
Household Appliances: Refrigerators, washing machines, air conditioner shells & inner tanks, microwave ovens, kitchen utensils, water heater housings
Hardware & Electromechanical Products: Power distribution cabinets, tool boxes, filing cabinets, bicycle frames, door locks, stamped hardware parts
Construction & Light Industry: Light steel keels, ventilation ducts, decorative panels, storage racks, door & window accessories
Coating Substrates: Base raw material for hot-dip galvanized coils and color coated coils
Equipment Manufacturing: Engineering machinery guards, instrument casings, small equipment frames
8. Surface Quality Classification Standard
FF Grade (Super Finished): Almost defect-free surface, only tiny dot marks allowed; for high-end home appliances and mirror appearance parts
FB Grade (Finished Grade, Standard Shipment): Slight minor scratches and roll marks on single side that do not affect painting; universal for most home appliances and hardware products
FC Grade (Ordinary Grade): Slight local color difference and tiny pitting allowed; applicable for internal structural parts and components covered after painting
9. Packaging & Marking Specifications
Packing Method: Horizontal coil packaging, inner waterproof plastic film, middle moisture-proof kraft paper, outer reinforced steel strip binding. Full closed wooden pallets for sea shipment to avoid collision, moisture and seawater corrosion.
Label Marking: Metal nameplate attached to the side of each coil, marking grade, specification, coil weight, furnace number, batch number, applicable standard, production date and manufacturer information for traceable inspection.
Shipment Documents: Original Material Test Certificate (MTC), Packing List, Commercial Invoice and Certificate of Origin are provided to complete full export customs clearance documents.
10. Storage & Operation Precautions
Store in dry and ventilated environment, avoid outdoor exposure to rain and damp ground to prevent surface rust.
Use special C-type lifting tools for coil hoisting; do not directly bind coil edges with steel wire ropes to prevent deformation and scratches.
No polishing required before processing; light oil stains can be painted directly. Supplementary anti-rust oil can be applied for secondary rust prevention during long-term storage.
Hard cold rolled coils are only suitable for small-angle bending; deep drawing and stretching processing are forbidden to avoid cracking and scrapping.
Send Inquiry to This Supplier
You May Also Like
-
Steel Sheet & Plate & Steel Sheet Pile，S275JR、S355JR、S390GP、S430GP、SY295、SY390、A690、GB/T20933、EN10248、JIS A5528、JG/T196-2018NegotiableMOQ: 5 Metric Tons
-
Steel Rebar & Hot Rolled Ribbed Bar，Φ12mm、14、16、18、20、22、25、28、32、40、50mmNegotiableMOQ: 5 Metric Tons
-
Steel Wire & Bright Wire, Q195, Q215, Q235B, 45#, 60#, 65#, 70#, 75#NegotiableMOQ: 5 Metric Tons
-
Flat Steel & Flat Steel Bar,Q355B/Q355D、20#、45#、40Cr、42CrMo、Q235BNegotiableMOQ: 5 Metric Tons
-
Steel Angle & Hot Dipped Galvanized Angle Steel，ASTM A36、EN10056、JIS G3192、GOST535NegotiableMOQ: 5 Metric Tons
-
Steel H Beam & H Beam，Q235B、Q355B、Q235C/D、Q355C/DNegotiableMOQ: 5 Metric Tons
-
Steel Pipe & Tube & Hot Dipped Galvanized Steel Pipe，ASTM A53/A53M、BS1387、EN10240、JIS G3444NegotiableMOQ: 5 Metric Tons
-
Steel Pipe & Tube & Alloy Steel Pipe，12Cr1MoVG、15CrMoG、SA335 P22/P91、1Cr5Mo、15CrMo、42CrMo、20CrMoNegotiableMOQ: 5 Metric Tons
-
Steel Pipe & Tube & OCTG Oil Country Tubular Goods，API 5CT, API 5B, API 5DP, API 5L, GB/T 19683, SY/T 6194NegotiableMOQ: 5 Metric Tons
-
Steel Pipe & Tube & High Pressure Boiler Tube，20G、15CrMoG、12Cr1MoVG、T91/P91, T92/P92NegotiableMOQ: 5 Metric Tons
