Premium Carbon Steel Coils: Reliable Materials for Industrial Rolling & Fabrication

1. What Are Carbon Steel Coils?

2. Key Specifications & Customization

2.1 Material Grades

• Low Carbon Steel Coils (C ≤ 0.25%): e.g., ASTM A1011, S235JR. Exceptional formability and weldability; perfect for automotive body panels, home appliances (refrigerator shells, washing machine drums), and light structural parts (roofing sheets, wall panels).

• Medium Carbon Steel Coils (0.25% < C ≤ 0.60%): e.g., ASTM A570, S355JR. Balanced strength and ductility; suitable for machinery components (gears, brackets), pipe manufacturing, and heavy-duty containers.

• High Carbon Steel Coils (C > 0.60%): e.g., ASTM A681, 1075. High hardness and wear resistance; used for tools, springs, blades, and high-stress industrial parts.

2.2 Dimensions

• Thickness: 0.1mm – 20mm (standard); customized up to 30mm for heavy-gauge applications.

• Width: 50mm – 2000mm (standard); narrow-width coils (50mm – 300mm) for small parts, wide-width coils (1000mm – 2000mm) for large panels.

• Coil Weight: 500kg – 30,000kg (standard); lightweight coils (500kg – 5,000kg) for easy handling, heavy coils (10,000kg – 30,000kg) for high-volume production.

• Inner Diameter: 508mm (standard); 610mm available upon request (to fit most industrial unwinding machines).

2.3 Surface Finish & Treatment

• Hot-Rolled (HR) Coils: Matte surface with slight oxidation; cost-effective for non-aesthetic applications (structural beams, pipe raw materials).

• Cold-Rolled (CR) Coils: Smooth, bright surface with tight thickness tolerance; ideal for parts requiring precision (automotive parts, electrical enclosures).

• Coated Coils:

  • Galvanized (zinc-coated): Enhances corrosion resistance for outdoor use (roofing, fencing).

  • Painted/Polyester-Coated: Available in custom colors for decorative applications (appliance exteriors, signage).

  • Oiled: Prevents rust during storage and transportation (easy to clean before processing).

  
  

3. Core Advantages of Our Carbon Steel Coils

3.1 Seamless Processing Efficiency

• Continuous Feeding: Coil form allows direct integration into roll forming, stamping, or slitting machines—reducing downtime from manual material handling and improving production speed by up to 30% compared to cut plates.

• Custom Length Cutting: We offer "cut-to-length" services to provide coils in your required length (minimum 100m), eliminating material waste and simplifying inventory management.

3.2 Consistent Quality & Performance

• Uniform Thickness: Advanced rolling technology ensures thickness tolerance of ±0.02mm (for cold-rolled coils) and ±0.1mm (for hot-rolled coils)—critical for precision fabrication.

• Strict Testing: Every coil undergoes tensile strength, elongation, and surface quality tests; ultrasonic flaw detection (UT) is available for high-demand applications (e.g., pressure vessels).

• Stable Chemical Composition: Sourced from certified steel mills, our coils have low impurity levels to avoid processing defects (e.g., cracks, warping) during bending or welding.

3.3 Cost-Effective & Versatile

• Bulk Pricing: Factory-direct supply with competitive bulk rates—ideal for large-volume orders (minimum order quantity: 1 coil, with discounts for orders over 10 coils).

• Multi-Industry Use: Suitable for automotive, construction, appliance, HVAC, and hardware industries; compatible with welding, drilling, and powder coating processes.

• Long Shelf Life: Oiled or galvanized finishes protect coils from rust, ensuring a 12-month shelf life under proper storage conditions (dry, ventilated warehouse).

4. Application Scenarios

• Automotive: Body frames, door panels, chassis components, and exhaust systems (low-carbon coils for formability, medium-carbon coils for strength).

• Construction: Roofing sheets, wall cladding, steel studs, and temporary fencing (galvanized coils for weather resistance).

• Appliances: Refrigerator liners, washing machine tubs, oven doors, and air conditioner casings (cold-rolled coils for smooth surface).

• Machinery: Gear blanks, bearing races, and conveyor belts (medium/high-carbon coils for wear resistance).

• Pipes & Tubes: Raw material for seamless or welded pipes used in water supply, oil, and gas pipelines (hot-rolled coils for ductility).

5. Packaging & Shipping

• Packaging:

  • Inner layer: Waterproof plastic film to prevent moisture.

  • Middle layer: Kraft paper or corrugated board for scratch protection.

  • Outer layer: Steel straps and wooden pallets (or steel drums for small coils) to secure during transport.

  
  

• Shipping:

  • Port of Loading: Shanghai, Qingdao, Tianjin (China) or custom ports (e.g., Rotterdam, Hamburg for European orders).

  • Transportation: Sea freight (FCL/LCL) for bulk orders (lead time: 20 – 35 days to major ports), air freight for urgent small orders (lead time: 5 – 7 days).

  • Loading & Unloading: We provide detailed guidelines for safe coil handling (e.g., using coil hooks, avoiding dropping) to prevent damage.

  
  

6. After-Sales Support

• Quality Guarantee: 12-month warranty from delivery date—if coils have manufacturing defects (e.g., uneven thickness, cracks), we offer free replacement or full refund.

• Technical Consulting: Our engineers provide free advice on coil selection (e.g., grade for stamping vs. bending) and processing tips (e.g., welding parameters).

• Spare Parts & Accessories: We supply coil unwinding machine parts (e.g., rollers, brakes) and cleaning agents for oiled coils at discounted prices.

• Return & Exchange: Flexible return policy for unused coils (within 30 days of delivery, subject to inspection).