Carbon steel strip and coil — narrow, long-format hot-rolled or cold-rolled flat product — is the workhorse material for stamping, roll-forming, cold-heading, and welded tube manufacturing. It is the feedstock from which a large fraction of the world’s automotive components, HVAC parts, fasteners, and appliance stampings are produced.
Huaxia-Steel supplies carbon steel strip and coil in hot-rolled pickled-and-oiled (P&O), cold-rolled full-hard, cold-rolled annealed, and galvanized conditions, from 0.3 mm to 12 mm thickness and up to 1,800 mm strip width, in commercial, drawing, and structural steel grades.
Product Overview
Carbon steel strip is differentiated by:
- Hot-rolled strip: Produced by hot-strip mill (continuous), typically 1.0 – 12 mm thick, supplied pickled & oiled (P&O) or as-rolled (HR).
- Cold-rolled strip: Further rolled from hot-rolled strip to thinner gauges (0.3 – 3.0 mm) with improved surface, dimensional tolerance, and strength.
- Galvanized strip: Cold-rolled strip hot-dip coated with zinc for corrosion resistance.
- Slit coil: Wide coils cut into narrower widths for specific roll-forming or stamping lines.
Specifications
Standards & Grade
- Hot-rolled strip: ASTM A1011 (CS Type B / DS Type B), JIS G3131 SPHC / SPHD / SPHE, EN 10111 DD11 / DD12 / DD13, GB/T 710 / 711
- Cold-rolled strip: ASTM A1008 (CS Type B / DS Type B), JIS G3141 SPCC / SPCD / SPCE, EN 10130 DC01 / DC03 / DC04 / DC05, GB/T 13237
- Galvanized strip: ASTM A653 (CS Type B / DDS), JIS G3302 SGCC / SGCH, EN 10346 DX51D +Z / DX52D +Z
- Structural strip: ASTM A1011 SS Grade 30 / 33 / 36 / 40, JIS G3101 SS400 / SS540
- Spring steel strip: ASTM A682 (high-carbon), JIS G4801
Dimensional Range
| Product | Thickness | Width | Coil ID | Coil Weight |
|---|---|---|---|---|
| Hot-rolled strip (HR) | 1.0 – 12 mm | 100 – 1,800 mm | 508 / 610 / 762 mm | 5 – 25 t |
| Pickled & Oiled (P&O) | 1.0 – 6.0 mm | 100 – 1,800 mm | 508 / 610 mm | 5 – 25 t |
| Cold-rolled full-hard | 0.3 – 3.0 mm | 100 – 1,800 mm | 508 / 610 mm | 5 – 25 t |
| Cold-rolled annealed | 0.3 – 3.0 mm | 100 – 1,800 mm | 508 / 610 mm | 5 – 25 t |
| Galvanized (GI / GA) | 0.3 – 3.0 mm | 100 – 1,500 mm | 508 / 610 mm | 5 – 20 t |
Mechanical Properties (typical)
| Grade / Condition | Yield (MPa) | Tensile (MPa) | Elong (%) |
|---|---|---|---|
| A1011 CS Type B (HR) | ≥205 | ≥340 | ≥25 |
| A1011 SS Grade 36 (HR) | ≥250 | ≥400 | ≥21 |
| A1008 CS Type B (CR) | 170 – 310 | ≥290 | ≥30 |
| SPCC (CR) | ≥130 | ≥270 | ≥38 |
| SPHC (HR) | ≥235 | ≥270 | ≥30 |
| SS400 (HR structural) | ≥245 | 400 – 510 | ≥21 |
| SGCC (GI) | ≥235 | ≥360 | ≥20 |
Surface Finish Options
| Finish Type | Surface Description |
|---|---|
| HR mill finish (HR) | Dark blue mill scale intact; suitable for structural use |
| Pickled & Oiled (P&O) | Clean gray, oil-coated for rust prevention |
| CR standard | Bright, smooth cold-rolled finish (Ra ≤1.0 μm) |
| CR matte / brushed | Lower gloss for specific paint and laminate applications |
| Standard hot-dip zinc with visible crystalline pattern | |
| GI zero spangle | Skin-passed zinc for paint applications (extra-smooth) |
| GA (galvannealed) | Zinc-iron alloy coating for superior paint adhesion |
Subgrades and Variants
| Subgrade | Use |
|---|---|
| Commercial Steel (CS) | Mild forming, structural |
| Drawing Steel (DS) | Moderate draw applications |
| Deep Drawing Steel (DDS) | Deep draw (auto panels, appliance) |
| Extra Deep Drawing (EDDS) | Severe draw applications |
| Structural Steel (SS Gr.30/40/50) | Structural load-bearing |
| High-Strength Low-Alloy (HSLA) | Crash structures, weight reduction |
| Bake-Hardenable (BH) | Automotive: panels with paint-bake strength gain |
| Advanced high-strength strip for automotive (specialty) |
Manufacturing Standards
- ASTM A1011/A1011M: Steel, sheet and strip, hot-rolled, carbon, structural, high-strength low-alloy and high-strength low-alloy with improved formability
- ASTM A1008/A1008M: Steel, sheet, cold-rolled, carbon, structural, high-strength low-alloy
- ASTM A653/A653M: Steel sheet, zinc-coated (galvanized) by the hot-dip process
- JIS G3131: Hot-rolled mild steel plates, sheets and strips (SPHC / SPHD / SPHE)
- JIS G3141: Cold-reduced carbon steel sheets and strips (SPCC / SPCD / SPCE)
- JIS G3302: Hot-dip zinc-coated steel sheets and strips (SGCC / SGCH)
- EN 10111: Continuously hot-rolled low-carbon steel sheet and strip for cold forming
- EN 10130: Cold-rolled low-carbon steel flat products for cold forming
- EN 10346: Continuously hot-dip coated steel flat products
- EN 10204 3.1: Mill test certificate
Typical Applications
Stamping & Forming
- Automotive body panels, structural reinforcements
- Appliance components (washer drum, dryer shell)
- HVAC ductwork, cabinets, panels
- Lockers, file cabinets, shelving
- Light fixture enclosures
Tube Manufacturing
- Feedstock for ERW tube mills (round, square, rectangular)
- Feedstock for cold-formed sections
- Feedstock for finned tubes (boiler, radiator)
Cold-Heading & Fasteners
- Wire and rod for cold-heading bolts, screws, rivets
- Coil stock for high-speed cold-forming presses
Roll-Forming
- C and Z purlins for steel buildings
- Roof and wall cladding profiles
- Window / door frames
- Shelving and storage rack components
- Solar panel mounting rails
Slit Coil Distribution
- Service centers slit wide coils to specific widths
- Stamping lines receive pre-slit coils for direct loading
- Tube mills slit to required feed widths
Coil Specifications Detail
- Coil outside diameter (OD): 1,200 – 2,000 mm typical
- Coil inside diameter (ID): 508 mm (20 in), 610 mm (24 in), 762 mm (30 in)
- Coil width: Same as supplied strip width (master coil) or slit to narrower widths
- Banding: Steel-banded with 4 – 6 straps; eye vertical or horizontal
- Marking: Heat number, grade, dimensions, weight per coil on identification tag
Quality Assurance
- MTC EN 10204 3.1: Per heat, listing chemistry, mechanical values.
- Surface inspection: Visual on 100% of coil at the exit section.
- Dimensional sampling: Thickness measured continuously (X-ray or beta gauge).
- Mechanical testing: Tensile per heat; hardness per batch.
- Surface roughness: Measured at exit (Ra for cold-rolled).
- Third-party inspection: SGS / BV / TUV / Intertek on request.
Packaging & Shipping
- Coil orientation: Eye vertical (most common) or horizontal per shipping preference
- Banding: 4 – 6 steel bands + protective edge pads
- Eye protection: Paper or cardboard ring inside the coil eye
- Surface protection: Plastic stretch wrap, VCI paper for long storage / shipping
- Container loading: 20′ GP / 40′ GP for slit coils; direct sea shipment for master coils
- Lead time: Stock grades 2 – 4 weeks; special sizes / slit widths 4 – 6 weeks
Slit Coil vs Master Coil Selection
Coils can be supplied either as master coils (full width from the rolling mill) or slit coils (cut into narrower widths). The right choice depends on your processing line and inventory strategy:
| Aspect | Master Coil | Slit Coil |
|---|---|---|
| Width | 1,200 – 1,800 mm (full mill width) | Custom cut to specified widths (typically 50 – 1,500 mm) |
| Cost per ton | Baseline | +5 – 12% for slitting |
| Lead time | 2 – 4 weeks | +1 – 2 weeks for slitting |
| Width tolerance | +5 / -0 mm per edge | ±0.5 mm or tighter |
| Best for | Tier 1 roll formers, large stamping lines, inventory feeding own slitter | Direct-feed stamping and roll-forming lines that need exact width |
| Inventory footprint | Stored wide; slit as needed | Pre-slitted; takes less width but more pieces |
Many steel service centers operate in-line slitters that can slit master coils into 4 – 12 narrower widths in one pass. These service centers allow the buyer to order master coils and slit on demand, reducing inventory cost.
Order Information
- Standard and grade: ASTM A1011/A1008, JIS G3131/G3141, EN 10111/10130, or GB equivalent
- Product type: Hot-rolled (HR), pickled & oiled (P&O), cold-rolled (CR), galvanized (GI / GA)
- Dimensions: Thickness (mm), width (mm), coil ID (mm)
- Mechanical properties: Yield, tensile, elongation (per standard or tighter)
- Surface finish: Mill, matte, bright, regular spangle, zero spangle, galvannealed
- Quantity: Total weight in metric tonnes, number of coils, slit widths if applicable
- Inspection: MTC only, third-party, supplementary tests
- Delivery: FOB / CIF / DDP to port or site
Continuous Hot-Dip Galvanizing Process
For galvanized strip and coil (GI / GA), the substrate is cold-rolled full-hard strip fed into a continuous galvanizing line. The sequence:
- Entry section: Coil loading, welding, cleaning (alkaline + electrolytic).
- Annealing furnace: Strip passes through a vertical furnace (radiant tube or direct fire) at 700 – 850 °C to anneal the cold-rolled structure. The atmosphere is HNX (5 – 15% H₂ in N₂) to prevent oxidation.
- Zinc pot: Strip enters a molten zinc bath at 450 – 470 °C. For galvanized steel, the bath is essentially pure zinc (with small additions of aluminum and antimony for control). For galvannealed, the strip receives additional heating after the pot to convert the coating to zinc-iron alloy.
- Coating weight control: Air knives (gas wiping) regulate the coating weight by stripping excess zinc with controlled high-velocity air.
- Cooling and inspection:
Strip cools, is inspected, oiled (typically 1.0 – 2.0 g/m² rust-preventative), and recoiled. - Tension leveling: Skin-pass mill with 0.5 – 3.0% elongation for surface finish and shape.
A modern galvanizing line produces 200 – 400 m/min strip with coating weights 60 – 275 g/m² per side (Z100 – Z275 designation).
Get a Quote
Need hot-rolled, cold-rolled, or galvanized carbon steel strip and coil? Huaxia-Steel supplies strip in HR, P&O, CR, and GI / GA conditions from 0.3 to 12 mm thickness, in commercial / drawing / structural grades per ASTM, JIS, EN, or GB standards. Slit coil available to your widths. EN 10204 3.1 mill certificate, third-party inspection on request, global shipping. Send your spec to [email protected] for a quotation.
Related Posts:
Huaxia-steel is a leading carbon steel supplier based in China.
With over 15 years of experience in the industry, we have built a reputation for providing high-quality products and exceptional service to our clients worldwide.
Our team of experts is committed to meeting our clients’ needs and providing solutions for their unique requirements.
We pride ourselves on our professionalism, integrity, and dedication to delivering the best possible customer experience.Address: RM557, NO.1388 Jiangyue Road, Shanghai China
Worktime: 8:30-20:00(Beijing time)
Phone: +86-021-54725826/+86-13012867759
Email: [email protected]
Get In touch
Request A Free Quote
Or contact us to see our certificatesWe’d like to work with you
If you require further information about our metal sheet products or architectural projects, please don’t hesitate to leave your contact details and message here.
Our team of experts will respond within 24 hours to continue the discussion and provide you with any additional information you requires.
