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Help CenterSteel Coil & Strip & Hot Rolled Coil，Q195、Q235B、SS400、A36、Q355B、S355JR、A572 Gr50、Q235B、L245、L290、L360
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1. Product Overview
Hot rolled coil is produced by continuous hot rolling after heating slab above recrystallization temperature. With low processing cost, wide thickness range and good plasticity, it is the base raw material for cold rolled coils, steel pipes, structural parts and various steel processing products. The surface presents black oxide scale, and can be processed into pickled plate, cut-to-length plate, slitted strips after secondary treatment. Widely used in machinery manufacturing, steel structure, pipe making, automobile, shipbuilding, engineering machinery and construction industries.
Main Implementation Standards
Chinese National StandardsGB/T 700 Q235B common carbon hot rolled coilGB/T 1591 Low alloy high strength hot rolled coilGB/T 3274 Dimensional tolerance of hot rolled plate and strip
Export International StandardsASTM A36, ASTM A572 Gr50, EN 10025 S23JR / S355JR, JIS G3101 SS400
Supporting Inspection StandardsGB/T 223 Chemical composition analysis, GB/T 228 Tensile test, GB/T 230 Hardness test
2. Common Material Grades & Applicable Fields
2.1 Ordinary Carbon Structural Steel
Grades: Q195, Q235B, SS400, A36
Working conditions: General steel structures, steel pipe blanks, low-strength mechanical parts, guardrails, brackets, civil construction components
Performance: Good weldability, forming performance, low cost, stable comprehensive mechanical properties
2.2 Low Alloy High Strength Steel
Grades: Q355B, S355JR, A572 Gr50
Working conditions: Engineering machinery, automobile frames, container base plates, heavy steel structures, bridge components
Performance: High yield strength, strong bearing capacity, good cold bending and impact resistance
2.3 Pipe Special Hot Rolled Coil
Grades: Q235B, L245, L290, L360
Working conditions: Welded pipe raw material for water, gas, fluid transmission pipelines
Performance: Strict control of internal inclusion, stable mechanical properties for pipe forming and welding
2.4 Boiler & Vessel Hot Rolled Coil
Grades: Q245R, Q345R
Working conditions: Medium and low pressure boiler shell, storage tank, heat exchanger manufacturing
Performance: Excellent low-temperature impact toughness, stable high-temperature performance
3. Specification Parameters
3.1 Thickness Range
1.5mm ~ 25.0mm
3.2 Width Range
900mm ~ 1800mm, customized slitting width available
3.3 Coil Inner Diameter & Outer Diameter
Inner diameter: 508mm / 610mm; Outer diameter: Max. 1800mm
3.4 Coil Weight
Single coil weight: 8–32 tons, customized small coils upon request
3.5 Dimensional Tolerance
Thickness tolerance: ±0.15mm ~ ±0.3mm according to different thickness
Width tolerance: 0 ~ +5mm
Camber, flatness, diagonal tolerance comply with GB/T 3274 standard
4. Complete Production Process
Slab Continuous Casting: Molten steel continuous casting into qualified rectangular slab, strict control of S, P harmful elements
Heating Furnace Heating: Slab heated to 1180~1250℃ for uniform austenitization
Rough Rolling: Multiple passes rough rolling to reduce slab thickness
Finish Rolling: High-speed continuous finish rolling to target thickness and width
Laminar Cooling: Controlled rapid cooling to stabilize mechanical properties
Coiling: Coiled at designated temperature into hot rolled coils
Surface & Dimension Inspection, Marking, Warehousing
5. Mandatory Factory Inspection Items
Chemical composition test: Spectral analysis of C, Si, Mn, S, P alloy elements
Mechanical performance test: Tensile strength, yield strength, elongation, cold bending test
Surface inspection: Check cracks, scabs, laminations, pits, heavy oxide scale defects
Dimensional inspection: Thickness, width, camber, flatness full inspection
Ultrasonic inspection (for vessel/boiler grade): Detect internal slab defects
6. Main Application Fields
Pipe Manufacturing Industry: Raw material for ERW welded pipes, spiral steel pipes, square and rectangular tubes
Steel Structure Engineering: Workshop steel beams, columns, supports, bridge steel plates
Machinery Manufacturing: Engineering machinery accessories, automobile chassis, truck frames
Vessel & Boiler Industry: Storage tank, medium-low pressure boiler shell, heat exchanger plates
Secondary Processing Base Material: Raw material for pickling plate, cold rolled coil, cut plate, slitting strips
Shipbuilding & Container: Ship hull structural plates, container base boards
7. Core Product Advantages
Wide thickness & width range, flexible matching for downstream processing
Good hot forming performance, easy bending, stamping, welding and pipe rolling
Stable internal metallographic structure, uniform mechanical properties of whole coil
Large single coil weight, high material utilization rate, less cutting waste
Short delivery cycle for regular specifications, cost-effective compared with thick plate
8. Delivery, Packing & Logistics
Delivery state: Hot rolled black surface with oxide scale, non-pickled
Coil marking: Each coil marked with steel grade, standard, weight, coil No., size, heat No.
Packing: Steel strips cross binding, coil eye protected by plastic guard ring, anti-rust paper wrapped inside
Delivery Lead TimeRegular spot hot rolled coils: 3–7 days deliveryCustom special thickness, width or special alloy grades: 7–10 days, shipped from Tianjin Port
Attached documents: Mill test certificate (MTC), dimension inspection report, mechanical property report
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