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Help CenterSteel Coil & Strip & Hot Rolled Coil，GB/T 709, GB/T 1591, GB/T 700, EN 10025, ASTM A36/A572, JIS G3101/G3116
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Hot Rolled Steel Coil Detailed Product Description
1. Product Definition
Hot Rolled Coil (HRC) takes continuous casting slab as raw material. It is heated above recrystallization temperature (about 900–1200℃), processed through rough rolling and finish rolling units, then cooled by laminar cooling and coiled into coiled flat steel products.
2. Production Process
Slab Preparation: Adopt continuous casting slab with conventional thickness of 150–250mm.
Heating: Heated to 1100–1250℃ in walking beam furnace for uniform plasticity.
High-pressure Water Descaling: Remove surface scale to avoid surface pressing-in defects.
Rough Rolling: 5–7 passes rolling, reducing slab thickness to 30–50mm to form intermediate slab.
Finish Rolling: 6–7 stands finishing mill, rolled to target thickness 1.2–25.4mm; finishing temperature: 800–900℃.
Laminar Cooling: Control cooling rate to obtain targeted microstructure and mechanical properties.
Coiling: Coiling temperature 550–650℃; standard inner diameter of steel coil: 762mm.
Finishing: Inspection, recoiling, leveling, slitting or cutting into steel plates.
3. Standard Specifications
Thickness: 1.2–25.4mm (Common: 1.5/2.0/3.0/4.0/6.0/8.0/10.0/12.7mm)
Width: 850–2000mm (Mainstream: 1250/1500/1800mm)
Coil Weight: 10–30 tons (Common: 15–25 tons)
Inner Diameter: 762mm; Outer Diameter: 1200–2050mm
Dimensional Tolerance (GB/T 709):
Thickness tolerance: ±0.10~±0.20mm
Width tolerance: Edge cut: 0~+3mm; No edge cut: +20mm
Flatness: ≤12mm/m; Camber: ≤4mm/2m
4. Common Steel Grades
Mild Carbon Steel: Q235B, SS400, SPHC
Low Alloy High Strength Steel: Q355B/C/D/E, S355JR, SM490
Quality Carbon Steel: 20#, 35#, 45#
Automobile Structural Steel: SAPH370/400/440, QStE345/420/460
Weather Resistant Steel: Q355NH, SPA-H
Pipeline Steel: L245, L360, X42/X52/X60
5. Surface Quality
Surface Feature: Hot rolled black surface with uniform oxide scale, roughness Ra 20–50μm.
Allowable Defects: Slight pitting, roll mark, color difference and non-tact scratch. Cracks, inclusion, severe rust and stop mark are not allowed.
Surface Treatment: Pickling, Shot Blasting, Anti-rust Oil Coating.
6. Mechanical Properties (Typical Q235B)
Yield Strength (ReH): ≥235MPa
Tensile Strength (Rm): 370–500MPa
Elongation (A): ≥26%
Cold Bending: 180° no damage (d=2a)
Q355B: Yield Strength ≥355MPa, Tensile Strength 470–630MPa, Elongation ≥21%
7. Product Characteristics
Cost-effective, lower price than cold rolled coil.
Excellent formability, suitable for bending, stamping and welding.
Moderate strength, meet general structural load requirements.
Rough original surface, available for subsequent pickling, cold rolling and painting.
Flexible specifications, customized width and length available.
8. Application Fields
Building steel structure, machinery manufacturing, automobile industry, energy engineering, shipbuilding, welded pipe, cold-formed section steel, shelf, scaffolding and hardware products.
9. Execution Standards
Chinese Standard: GB/T 709, GB/T 1591, GB/T 700
International Standard: EN 10025, ASTM A36/A572, JIS G3101/G3116
10. Packaging & Transportation
Packaging: Protected by inner and outer guard plates, fixed with steel strapping, wrapped with anti-rust film.
Marking: Steel grade, specification, heat number, weight, production date and manufacturer logo marked on each coil.
Storage & Shipping: Keep rainproof and moisture-proof, avoid heavy collision; stacking layers ≤3.
11. Delivery Cycle
Delivery Time: 5-7 working days for standard stock specifications; customized specifications to be confirmed separately.
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