Carbon Steel Coil | Hot Rolled & Cold Rolled Steel Coil (HR Coil & CR Coil)

Huaxia Steel — Professional Carbon Steel Coil Manufacturer & Supplier
15+ years of experience | ISO 9001 & SGS Certified | Factory-direct pricing | Custom slitting available | Worldwide shipping

What is Carbon Steel Coil?

Carbon steel coils are flat-rolled steel products wound into coils, available in both hot-rolled (HR) and cold-rolled (CR) variants. They serve as the primary raw material for downstream processing including cutting, stamping, bending, welding, and pipe/tube manufacturing. Huaxia Steel supplies carbon steel coils conforming to ASTM, JIS, EN, and GB standards, serving construction, automotive, shipbuilding, and appliance industries worldwide.

Available Grades & Standards

Chemical Composition & Mechanical Properties of Common Carbon Steel Coil Grades

Grade	Standard	C%	Mn%	Si%	Yield (MPa)	Tensile (MPa)
Q195	GB/T 700	≤0.12	0.25–0.50	≤0.30	≥195	315–430
Q235B	GB/T 700	0.12–0.20	0.30–0.67	≤0.35	≥235	375–500
Q345B	GB/T 1591	≤0.20	1.00–1.60	≤0.55	≥345	470–630
A36	ASTM A36	0.25–0.29	0.85–1.20	≤0.40	≥250	400–550
SS400	JIS G3101	≤0.15	≤1.40	—	≥245	400–510
S235JR	EN 10025-2	≤0.17	≤1.40	—	≥235	360–510
S355JR	EN 10025-2	≤0.22	≤1.60	≤0.55	≥355	470–630
SPCC	JIS G3141	≤0.15	≤0.60	—	—	≥270
DC01	EN 10130	≤0.10	≤0.45	—	—	270–410

Dimensions & Specifications

Carbon Steel Coil Size Range & Tolerances

Parameter	Hot Rolled Coil (HRC)	Cold Rolled Coil (CRC)
Thickness	1.5–25mm	0.3–3.0mm
Width	600–2000mm	600–1850mm
Inner Diameter	508mm / 610mm	508mm / 610mm
Outer Diameter	1000–2000mm	1000–1800mm
Coil Weight	5–30 tons	3–20 tons
Tolerance	ASTM A6/A568	EN 10131 / JIS G3141

Manufacturing Process

Carbon steel coils are produced through two primary rolling processes:

Hot Rolling (HR): Slabs are heated above their recrystallization temperature (typically 1100–1250°C) and passed through a series of rollers to reduce thickness. Hot-rolled coils feature a dark oxide scale surface (blue-grey finish) and are suitable for structural, piping, and general fabrication applications where surface finish is secondary.

Cold Rolling (CR): Hot-rolled pickled coils are further reduced at room temperature through precision rollers to achieve tighter thickness tolerances (as low as ±0.02mm), improved surface finish (bright, scale-free), and enhanced mechanical properties. Cold-rolled coils are ideal for automotive body panels, appliance shells, and precision stamping.

Surface Finish & Treatment Options

Available surface finishes and treatments:
– Hot Rolled, Pickled & Oiled (HRPO): Black oxide removed by acid pickling, coated with light oil to prevent rust
– Cold Rolled, Bright: Smooth, scale-free surface for exposed applications
– Galvanized (GI/GA): Zinc-coated for enhanced corrosion resistance
– Pre-painted/Coated: Color-coated steel coil for building panels
– Skin-passed: Light cold reduction for improved flatness and surface quality

Common Applications

• Construction: roofing panels, wall cladding, structural decks, corrugated sheets
• Automotive: body panels, chassis components, inner panels, reinforcement parts
• Shipbuilding: hull plates, deck structures, bulkheads
• Pipe & Tube manufacturing: ERW pipes, LSAW pipes, spiral pipes, square/rectangular tubes
• Home Appliances: refrigerator shells, washing machine drums, air conditioner casings
• Machinery: brackets, frames, guards, enclosures
• Storage tanks, silos, and pressure vessels
• Metal furniture, shelving, and racking systems

Why Choose Huaxia Steel as Your Carbon Steel Coil Supplier?

Factory-Direct Pricing

Eliminate middlemen. Our direct mill partnerships ensure competitive pricing on every order, from small prototype quantities to full container loads.

Certified Quality

Every shipment includes full mill test certificates (MTC/EN 10204 3.1). ISO 9001:2015 certified. Third-party SGS inspection available on request.

Custom Processing

Cut-to-size, precision slitting, bending, welding, galvanizing, and surface treatment services. We deliver material ready for your production line.

Fast Global Logistics

Efficient shipping to North America, Europe, Middle East, Southeast Asia, and beyond. Standard lead time 7–15 days for stock items.

Frequently Asked Questions

What is the difference between hot rolled and cold rolled steel coil?

Hot rolled coils are processed at high temperatures (above recrystallization point), resulting in a scaled surface, wider thickness range (1.5–25mm), and lower cost. Cold rolled coils are processed at room temperature from pickled hot-rolled material, delivering tighter tolerances (±0.02mm), superior surface finish, and higher strength. Choose HR for structural/fabrication uses and CR for precision stamping and exposed-surface applications.

What is the standard coil inner diameter (ID)?

The most common coil inner diameters are 508mm (20 inches) and 610mm (24 inches). 508mm ID is the industry standard for most international trade. Custom ID sizes are available upon request, typically at a minimum order quantity.

Can you slit carbon steel coils to custom widths?

Yes. Huaxia Steel offers precision coil slitting services. We can slit coils to widths as narrow as 10mm with tolerance of ±0.5mm. Our slitting lines handle both hot-rolled and cold-rolled coils up to 2000mm original width. Custom slit widths reduce your material waste and machining costs.

What certifications do your carbon steel coils carry?

All coils are supplied with Mill Test Certificates (MTC/EN 10204 3.1) showing chemical composition and mechanical properties. We are ISO 9001:2015 certified. Third-party inspection from SGS, BV, or TUV is available upon request.

What is the minimum order quantity?

Our standard MOQ is 5 tons for stock items and 10 tons for production orders. For trial or sample orders, we can accommodate smaller quantities—contact us for details.

How do you pack steel coils for export shipping?

Standard export packing: coils wrapped with waterproof paper and steel straps, placed on wooden pallets or steel frames. Sea-worthy packing with desiccants ensures safe delivery for ocean freight.