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Help CenterSteel Coil & Strip & Hot-Rolled Coil,S235JR、SS400、A36、SPHC/SPHD/SPHE、S355JR、A572Gr50
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Steel Coil & Strip & Hot-Rolled Coil,S235JR、SS400、A36、SPHC/SPHD/SPHE、S355JR、A572Gr50NegotiableMOQ: 5 Metric Tons -
Steel Coil & Strip & Cold Rolled Steel Coil，DC01、DC03、DC04NegotiableMOQ: 5 Metric Tons
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Steel Coil & Strip & Cold Rolled Steel Coil，DC01、DC03、DC04NegotiableMOQ: 5 Metric Tons
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Steel Coil & Strip & Cold Rolled Steel Coil，DC01、DC03、DC04NegotiableMOQ: 5 Metric Tons
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Steel Coil & Strip & Cold Rolled Steel Coil，DC01、DC03、DC04NegotiableMOQ: 5 Metric Tons
1. Product Definition
Hot Rolled Steel Coil (HRC) adopts continuous casting slab as raw material. The slab is heated in a furnace above the recrystallization temperature (about 1100–1250℃), then processed through roughing mill and finishing mill for continuous rolling. After laminar cooling and coiling, it is formed into steel coils. It is a basic flat steel material with low cost and good formability, widely used in various industries.
2. Production Process Flow
Slab incoming → Reheating furnace heating → Rough rolling (thickness reduction & width sizing) → Finish rolling (rolling to target thickness) → Laminar cooling (temperature control) → Coiling → Finishing (leveling, slitting/shearing, flaw detection, oiling, packaging) → Finished product warehousing.
3. Core Specification Parameters
3.1 Dimension Range
Thickness: 1.2–25.4 mm (common: 1.5–12.7 mm)
Width: 940–2000 mm (regular: 1000/1250/1500/1800 mm)
Coil weight: 15–30 tons (common: 17–22 tons)
Inner diameter: φ508 mm / φ610 mm (standard size)
3.2 Common Grades (GB & Export Standard)
Carbon Structural Steel (General Use)
GB: Q195, Q215B, Q235BExport: S235JR, SS400, A36, SPHC/SPHD/SPHE
Low Alloy High Strength Steel
GB: Q355B, Q390B, Q420MBExport: S355JR, A572Gr50
Quality Carbon Structural Steel
Grade: 10#, 20#, 35#, 45#, 50# (S10C/S20C/S45C)
Special Steel Grade
Automotive structural steel: SAPH370/400/440, QStE345/420/500
Weathering steel: Q235NH, Q355NH, 09CuPCrNi-A
Pressure vessel steel: SPV235/355, HP295/345
Pipeline steel: L245, L360, L415, X42/X52/X60/X65/X70
3.3 Chemical Composition (Typical, wt%)
| Grade | C | Si | Mn | P ≤ | S ≤ |
|---|---|---|---|---|---|
| Q235B | 0.12–0.20 | ≤0.30 | 0.30–0.70 | 0.045 | 0.045 |
| Q355B | ≤0.20 | ≤0.50 | 1.00–1.60 | 0.035 | 0.035 |
| SPHC | ≤0.15 | ≤0.05 | ≤0.60 | 0.040 | 0.040 |
3.4 Mechanical Properties (Typical)
| Grade | Yield Strength ReH (MPa) | Tensile Strength Rm (MPa) | Elongation A (%) | Cold Bending |
|---|---|---|---|---|
| Q235B | ≥235 | 370–500 | ≥26 | Qualified |
| Q355B | ≥355 | 470–630 | ≥21 | Qualified |
| SPHC | ≥140 | 270–410 | ≥30 | Qualified |
4. Surface Quality & Delivery Condition
4.1 Surface Feature
Natural dark grey oxide scale (intrinsic for hot rolling, can be removed by pickling).
Allowable defects: slight pitting, roll mark, color difference and non-tact scratch, which will not affect forming and welding performance.
Unacceptable defects: crack, inclusion, shelling, heavy rust and stop mark.
4.2 Delivery State
As rolled (black surface), pickled state (oxide scale removed with silver-grey surface), leveled state (improved flatness and surface), oiled / non-oiled for rust prevention.
5. Main Characteristics
Low cost: Mature production process with high efficiency, cheaper than cold rolled coils.
Good ductility: Rolled at high temperature with high elongation, easy for bending, stamping and deep processing.
Moderate strength: Carbon steel for general structure; low alloy high strength steel can replace thick plate to realize lightweight and cost reduction.
Excellent weldability: Low carbon equivalent, low sensitivity to welding crack, suitable for various welding processes.
Ordinary surface precision: Dimensional tolerance and surface finish are lower than cold rolled steel, with natural oxide scale, requiring subsequent surface treatment.
6. Application Fields
6.1 Steel Structure Construction
Factory buildings, high-rise building beams & columns, steel structure bridges, iron towers, photovoltaic brackets, scaffolding and guardrails.
6.2 Machinery Manufacturing
Machine tool base, frame, flange, stamping parts, hardware tools, electrical cabinet and conveyor belt.
6.3 Automobile Industry
Vehicle frame, chassis parts, wheel rim, carriage plate, longitudinal beam and bumper reinforcement parts.
6.4 Energy & Pressure Vessel
Oil & gas transmission pipeline, boiler drum, pressure vessel, welding gas cylinder and storage tank.
6.5 Other Applications
Shipbuilding (hull structure, bulkhead), welded pipe (straight seam / spiral welded pipe), container, agricultural machinery and engineering machinery.
7. Executive Standards
China Standard: GB/T 700, GB/T 1591, GB/T 912, GB/T 3274
International Standard: EN 10025, ASTM A36/A572/A1011, JIS G3101/G3113/G3131
8. Packaging, Storage & Transportation
Packaging: Wrapped with anti-rust paper, plastic film and steel strapping; equipped with end protector, marked with grade, specification, batch number and weight.
Storage: Store in dry and ventilated warehouse, avoid rain and moisture; place with cushion to prevent deformation, keep away from corrosive medium.
Transportation: Use special sling for hoisting; avoid collision and surface scratch; fix coils firmly to prevent rolling.
9. Comparison Between Hot Rolled Coil and Cold Rolled Coil
| Item | Hot Rolled Steel Coil (HRC) | Cold Rolled Steel Coil (CRC) |
|---|---|---|
| Rolling Temperature | Above recrystallization temperature (high temperature) | Below recrystallization temperature (room temperature) |
| Surface | Dark grey with oxide scale, rough | Bright silver, high precision |
| Thickness Range | 1.2–25.4 mm (medium & thick) | 0.2–3.0 mm (thin) |
| Ductility | Excellent, easy forming | Good, higher hardness |
| Cost | Low | Higher |
| Main Usage | Structural parts, welding parts, thick components | Stamping parts, appearance parts, precision parts |
10. Purchasing Notes
Confirm steel grade, dimension, executive standard, surface condition and oiling requirement.
Check mill test certificate for chemical composition and mechanical properties to meet standard requirements.
Inspect surface quality, dimensional tolerance and flatness, free from crack, shelling and heavy rust.
Confirm coil weight, inner diameter and packaging mode to match uncoiling equipment and transportation.
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