Carbon Steel Coil Description
Hot-rolled and cold-rolled carbon steel coils in Q235, Q345, Q355, ASTM A36, and SS400 grades. Thickness 0.3–25mm, width up to 2000mm. In-house slitting, cutting, and surface finishing. Every coil includes EN 10204 3.1 mill certification with full heat-number traceability.
Why Source Carbon Steel Coils from Jiangsu Cunrui?
When you're specifying carbon steel for structural frames, automotive components, or precision fabrication, three risks dominate procurement decisions: material substitution, dimensional inconsistency, and documentation gaps. We built our supply chain to eliminate all three.
✅ Direct Mill Partnerships: We source exclusively from TISCO, Baosteel, POSCO, and Lianzhong-no trading intermediaries. Every coil arrives with original mill test certificates and traceable heat numbers.
✅ In-House Precision Processing: Our 18,000 sqm facility handles slitting, cutting, leveling, and surface finishing under one roof. This means tighter tolerance control, faster turnaround, and zero outsourcing delays.
✅ Engineer-to-Engineer Support: Share your application requirements-operating environment, load conditions, fabrication methods-and our technical team will recommend the optimal grade, finish, and processing route. No sales scripts, just specification-driven guidance.
Technical Specifications
| Project Name | Carbon Steel Coil |
| Grades Available | Q235, Q345, Q355, ASTM A36, SS400, S235JR |
| Thickness Range |
0.3mm – 25mm |
| Master coils | 600–2000mm |
| Coil Weight | 3–25 metric tons per coil |
| Surface Finish | Hot rolled pickled & oiled, Cold rolled bright , Black annealed, Galvanized, pre-painted, or brushed finish available on request |
| Mechanical Properties | Yield strength, tensile strength, and elongation tested per GB/ASTM/JIS standards. Batch test reports provided with every shipment. |
| Certification & Documentation | EN 10204 3.1 Mill Test Certificate with heat number traceability. Third-party inspection (SGS/BV/TÜV) supported upon request. |
Applications & Industries Served
Construction & Infrastructure
Structural frames, reinforcement components, pre-fabricated modules, bridge parts, and foundation elements.
Automotive & Transportation
Chassis brackets, exhaust system parts, trailer frames, agricultural machinery components, and body panels.
Machinery & Equipment
Base plates, gear housings, hydraulic cylinder bodies, industrial equipment frames, and wear-resistant parts.
General Fabrication & OEM/ODM
Custom cutting, bending, and welding for prototype development, small-batch production, and contract manufacturing projects.
FAQ About Carbon Steel Coil
Q: What's the practical difference between Q235 and Q345 for fabrication?
A: Q235 offers excellent formability and weldability at lower cost-ideal for brackets, non-structural frames, and general sheet metal work. Q345 provides ~45% higher yield strength with comparable weldability, making it essential for load-bearing structures, crane components, or applications where deflection control matters. Both support custom cutting and surface finishing.
Q: Can you slit a 1500mm master coil to 387mm width with ±0.5mm tolerance?
A: Yes. Our precision slitting lines handle custom widths from 600–2000mm masters down to your required dimension. Minimum order: 5 tons per width specification. Lead time: +2–3 days vs. standard coils.
Q: Do you provide Mill Test Certificates for every coil?
A: Yes-EN 10204 3.1 MTC is mandatory for every shipment, including heat number, chemical composition, mechanical properties, and mill signature. We also perform in-house spectrometer verification and provide our QC report. Third-party inspection is available upon request.
Q: What's your MOQ for non-standard thickness or special grades?
A: Standard grades: 1 tons MOQ. Non-standard thickness or special grades: 10–20 tons depending on mill production schedule. Contact us early for feasibility confirmation-we'll check mill availability and advise on lead time/cost implications.
Q: How do you protect coils during ocean freight to humid destinations?
A: Standard export packing includes VCI anti-rust film + waterproof PE wrapping. For high-humidity destinations, we recommend:
(1) upgraded VCI film with extended protection period,
(2) additional desiccant packs inside packaging,
(3) galvanized coils for critical applications. We'll advise based on your destination port and storage conditions.
Q: Can I get a sample before placing a bulk order?
A: Yes. We provide free material samples for evaluation. Shipping cost is borne by the buyer. Samples include cut pieces from production stock + relevant MTC excerpt + finish reference card. Typical sample lead time: 3–5 days.
Q: What if there's a quality discrepancy upon arrival?
A: We guarantee material compliance with agreed specifications. If discrepancies are confirmed via third-party report, we cover replacement, rework, or refund per our quality warranty clause. Response within 48 hours. In 20 years, we've resolved fewer than 0.3% of shipments this way-documentation and pre-shipment verification prevent most issues.
Ready to Specify Carbon Steel Coils for Your Next Project?
Whether you need standard Q235/Q345 coils for structural fabrication or custom-slitted, precision-tolerance coils for OEM production, our engineering team provides specification-driven support-not just order taking.
