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Help CenterSteel Coil & Strip & Hot Rolled Coil，ASTM A36、ASTM A572 Gr50、EN10025、JIS G3101、JIS G3131、API 5L
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1. Product Overview
Hot Rolled Coil (HRC) is produced from steel slabs. After high-temperature heating in reheating furnace, the slabs go through continuous rough rolling and finish rolling, laminar cooling and coiling to form coil products. Without cold rolling at room temperature, finished coils retain hot rolled black oxide scale. It features low cost, fast delivery, full thickness range and flexible deep processing performance. As one of the most widely used steel raw materials, it serves machinery manufacturing, steel structure, construction machinery, pipe production and metal stamping industries.
Hot Rolling Forming Principle
Slabs are heated to 1100–1250℃ in walking beam furnace to eliminate casting defects inside metal. Roughing mill repeatedly reduces slab thickness, then finishing mill rolls slabs to target thickness. Laminar cooling water uniformly controls cooling speed to refine grain and improve comprehensive mechanical properties. Finally, coiler winds steel into compact coils for convenient storage, transportation, slitting and leveling.
2. Main Steel Grades & Applicable Working Conditions
2.1 Ordinary Carbon Hot Rolled Coil (General Structure & Stamping)
Q195, Q235A/Q235B, Q255B
Q235B: Universal mainstream grade with balanced plasticity, welding and bending performance for most ordinary structural parts.
2.2 High Strength Low Alloy Hot Rolled Coil (Heavy Load Components)
Q355B, Q355C, Q355D, Q355EGrades C/D/E deliver progressively improved low-temperature impact toughness, suitable for outdoor low-temperature equipment, construction machinery, vehicle girders and load-bearing steel structures.
2.3 Pipeline Special Hot Rolled Coil
L245, L290, L360, L415, X42/X52/X60/X70, used as raw material for SAW and LSAW steel pipes.
2.4 Vessel & Boiler Special Hot Rolled Coil
Q245R, Q355R, base material for pressure vessels, boiler barrels and storage tanks.
2.5 Wear-resistant Hot Rolled Coil
NM400, NM450, NM500, applied in mining equipment, dump trucks and wear-resistant liners.
3. Applicable Standard System
Domestic Chinese Standards
GB/T 14977 Dimensions, shape, mass and tolerances of hot rolled steel plates and stripsGB/T 3274 Hot rolled carbon structural and low alloy structural steel stripsGB/T 1591 High strength low alloy structural steelsGB/T 713 Steel plates and strips for pressure equipmentGB/T 24186 Wear resistant steel plates for construction machinery
International Export Standards
ASTM A36, ASTM A572 Gr50, EN10025, JIS G3101, JIS G3131, API 5L
4. Complete Specification Parameters
Thickness Range: 1.5mm–25.0mm; thin gauge 1.5–6mm, medium gauge 6–14mm, heavy gauge 14–25mm
Standard Width: 900mm, 1000mm, 1250mm, 1500mm, 1800mm, 2000mm; custom non-standard width available
Single Coil Weight: Regular 10–32 tons, small split coils 3–8 tons on request
Inner Diameter: Standard 508mm, 610mm
Surface Types
Black Hot Rolled Coil: Original oxide scale surface, most cost-effective
Pickled Hot Rolled Coil: Descaled smooth surface for direct stamping and painting
Further Processing FormsWhole coil, leveled hot rolled plate, slitted narrow strips, cut-to-size plates, custom cutting pieces
Dimensional Tolerance Control
Thickness tolerance ±0.1–0.3mm; width tolerance 0~+10mm; strict control on flatness, camber and coil telescoping to match leveling machine processing.
5. Complete Production Process
Continuous casting slab storage → Slab inspection → High-temperature heating in walking beam furnace → High-pressure water descaling → Multi-pass rough rolling → Hot coil box buffer → Continuous finish rolling → Laminar cooling temperature control → Down coiler winding → Coil marking & coding → Cooling & aging → Finishing inspection → Strapping & warehousing
6. Mandatory Batch Inspection Standards (Sampling Test Per Batch)
6.1 Physical & Mechanical Tests
Tensile test: Yield strength, tensile strength, elongation after fracture to distinguish strength grades
Charpy impact test: Low-temperature impact test for Q355C/D/E for cold environment service
Bend test: No cracks after 180° cold bend, suitable for bending and stamping
Metallographic examination: Uniform grain without severe segregation or inclusions
Spectrochemical analysis: Strict control over harmful impurities C, Si, Mn, S, P
6.2 Appearance & Dimensional Inspection
Neat coil shape without severe telescoping, loose coil or collapse; surface free of cracks, scabs, slivers, pits and scratches; thickness, width and coil weight checked and recorded coil by coil.
6.3 Non-Destructive Sampling Test
Ultrasonic lamination inspection for internal delamination and shrinkage cavity defects; DWTT drop weight tear test added for pipeline coils.
7. Core Product Advantages
Low overall cost & short delivery cycleNo cold rolling and annealing procedures, lower production cost with sufficient mill stock for fast delivery of regular sizes.
Full specification range & flexible customizationAdjustable thickness, width and coil weight; available for leveling, slitting and cutting to meet diverse processing demands across industries.
Excellent weldability, stamping & bending performancePopular Q235B and Q355 series feature good plasticity, crack-free welding and deep drawing & bending forming capacity.
High load-bearing capacity of HSLA gradesQ355 series delivers much higher yield strength than carbon steel, enabling thinner material usage and lighter overall weight under equal load.
Compatible with full deep processing chainAvailable for pickling, cold rolling, hot-dip galvanizing, painting, cutting and forging as basic raw material for downstream steel products.
Stable forming for large componentsWide-width hot rolled coils can be leveled into large panels for large steel structures, tanks and construction machinery to reduce splicing welds.
8. Main Application Fields
Steel Structure EngineeringFactory steel columns, beams, purlins, curtain wall frames, bridge accessories, tower crane standard sections.
Construction Machinery IndustryBeams and frames for excavators, loaders and dump trucks, wear-resistant liners, equipment bases.
Pipe Manufacturing IndustryRaw material for spiral welded pipes and straight seam welded pipes for water, gas and oil & gas transportation pipelines.
Pressure Vessels & Storage TanksOil storage tanks, chemical storage tanks, boiler barrels, heat exchanger shells, gas tank plates.
Metal Stamping & Agricultural MachineryAgricultural machinery frames, carriage plates, hardware fittings, storage racks, container side panels, door blank sheets.
Shipbuilding & Rail TransitAuxiliary deck steel for ships, truck carriage plates, railway auxiliary steel structures.
General Machinery ManufacturingEquipment bases, frames, flange blanks, gear blanks and all kinds of mechanical structural supports.
9. Packaging, Loading Port & Lead Time
Standard Export PackagingSteel guard rings fitted on inner and outer coil circles, cross strapping with steel bands; wrapped with waterproof anti-rust plastic film and covered with blue waterproof woven cloth; paper tube inside coil core to avoid deformation during transportation.
Loading Port: Tianjin Port, shipment available via Qingdao Port and Shanghai Port.
Lead Time
Regular stock Q235B hot rolled coils: 5–7 days
Q355B/C/D/E HSLA coils & pipeline coils: 7–12 days
Wear-resistant coils, vessel special coils, custom thickness & width: 12–20 days
MOQ & SamplesMinimum order quantity 25 tons; small sample plates provided free for material and mechanical performance testing.
10. Supporting Quality Assurance Documents
Complete original Chinese & English factory certificates:
Heat number chemical composition analysis report
Mechanical test report (tensile, bend, low-temperature impact)
Dimensional tolerance inspection data sheet
Surface appearance inspection record
GB / API factory certificate, packing list, certificate of origin
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