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Cold Rolled Steel Coil
Home Appliance Industry: Casings, inner tanks, side panels and structural parts of refrigerators, washing machines, air conditioners and other home appliances, relying on excellent surface quality to adapt to subsequent processes such as painting and film coating
Automotive Manufacturing: Auto body panels, door inner panels, instrument panel brackets and other interior and exterior parts, meeting the needs of lightweight and high-precision forming
Hardware Products: High-end furniture accessories, kitchenware, bathroom hardware, electronic component casings,etc., improving product texture with a delicate surface
Packaging Industry: Thin steel plates for food cans, gift boxes, hardware packaging, balancing sealing performance and aesthetics
Electronic and Electrical Industry: Transformer cores, motor casings, cable trays, etc., ensuring assembly compatibility with good stamping performance and dimensional accuracy.
2.Product Advantages
Excellent Surface Quality: The surface is flat and smooth without scale after cold rolling, with low roughness, and can be directly subjected to surface treatments such as painting and electroplating without additional grinding
High Dimensional Accuracy: Small thickness and width tolerances, regular plate shape, which can accurately match high-precision mold processing and reduce subsequent trimming processes
Superior Mechanical Properties: After cold rolling, the steel grains are refined, with higher yield strength and tensile strength, balanced toughness and wear resistance, suitable for complex stamping forming
Excellent Processing Performance: Easy to perform stamping, bending, shearing, welding and other processing, not easy to crack or deform after forming, with high production efficiency
Diversified Specifications: Multiple thickness (0.3-3.0mm) and width (900-1800mm) options are available, supporting customized slitting and leveling on demand to adapt to different scenario needs
Good Appearance Consistency: Products produced in batches have uniform surface color and thickness, ensuring the unity and aesthetics of end products.
3.Technical Parameters
Parameter | Specification Range | Standard/Notes |
Steel Grade | SPCC, SPCD, Q235, ASTM A1008 | GB/T 11253 / ASTM A1008 |
Thickness | 0.15 - 3.0 mm | ±0.01 mm Tolerance |
Width | 600 - 1600 mm | ±1 mm Tolerance |
Coil Weight | 2 - 20 tons | Max. Outer Diameter: 1800 mm |
Surface Finish | 2B, BA, Matte | Customizable |
Tensile Strength | 350 - 550 MPa | GB/T 228.1 |
Yield Strength | ≥220 MPa | GB/T 228.1 |
Elongation | ≥30% | GB/T 228.1 |
Hardness | 60 - 90 HRB | GB/T 231.1 |
4.Production process
Raw Material Preparation: Use hot-rolled steel coil as raw material, undergo degreasing and derusting pretreatment to ensure clean surface without impurities
5.FAQ
Q1:What are the core differences between cold-rolled steel coils and hot-rolled steel coils? How to choose?
A1:Core differences: Cold-rolled steel coils have a smooth surface, high dimensional accuracy and thin thickness (≤3.0mm), but higher cost; hot-rolled steel coils have scale on the surface, lower accuracy and thick thickness (≥1.5mm), with lower cost. Selection suggestions: Choose cold rolling for scenarios requiring high surface quality and accuracy (such as home appliances, automotive interiors); choose hot rolling for structural parts with low surface requirements and focusing on cost control (such as factory brackets).
Q2:Is cold-rolled steel coil prone to rust? How to implement good rust prevention measures?
A2:Cold-rolled steel coils have no scale protection on the surface and are prone to rust in humid and salt-spray-rich environments. Rust prevention measures: 1. Apply anti-rust oil on the surface at the factory; 2. Store in a dry and ventilated environment, avoiding rain and contact with corrosive substances; 3. Wrap with waterproof tarpaulin when not in use for a short period; 4. Perform surface treatments such as painting, galvanizing and film coating before long-term use.
Q3:What key points should be noted in the welding of cold-rolled steel coils?
A3:1. It is necessary to clean impurities such as anti-rust oil and dust in the weld area before welding to avoid affecting the welding quality; 2. Select low-hydrogen electrodes (such as E4315) or matching welding wires to reduce the risk of welding cracks; 3. Control the welding current and speed to avoid plate deformation or burn-through caused by high temperature; 4. Spot welding or argon arc welding is recommended for thin-gauge cold-rolled steel to reduce heat input; 5. Clean welding slag in time after welding, and straighten parts with high precision requirements.
Q4:Can cold-rolled steel coils be customized with special sizes? Is there a requirement for the minimum order quantity?
A4:Yes, customization is available. The conventional specifications are thickness 0.3-3.0mm and width 900-1800mm. Thickness, width beyond the conventional range or special slitting sizes can be customized through negotiation with the manufacturer. The minimum order quantity (MOQ) is usually 3-5 tons/specification, and better prices can be enjoyed for bulk customization. The specific price is subject to the manufacturer's quotation.
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