Hot Rolled Steel Coils Manufacturer for Industrial and Structural Use

At YS STEEL, we manufacture and supply hot rolled steel coil products designed for demanding industrial applications across construction, automotive, pipe manufacturing, machinery, shipbuilding, and energy sectors. Our hot rolled coils are produced using advanced rolling technology and strict quality controls to deliver consistent thickness, surface quality, and mechanical performance. This detailed technical guide covers product parameters, dimensional tolerances, chemical composition, available grades, packaging methods, quality certifications, and frequently asked questions to help procurement professionals, fabricators, and engineers make informed purchasing decisions.

Key Product Parameters

The following list summarizes the standard product parameters for YS STEEL Hot Rolled Steel Coils. Custom dimensions and specifications can be arranged based on project requirements and minimum order quantities.

Thickness range: 1.2 mm to 25.4 mm
Width range: 600 mm to 2,000 mm (custom widths available up to 2,200 mm)
Coil inner diameter: 508 mm (20 inches) or 610 mm (24 inches)
Coil outer diameter: 1,000 mm to 2,200 mm depending on coil weight
Coil weight: 3 metric tons to 30 metric tons per coil
Surface finish: Black (mill finish), pickled and oiled, dry, skin passed
Edge condition: Mill edge or trimmed edge
Minimum order quantity: 25 metric tons per specification (mixed sizes available)
Delivery forms: Coils, slit coils, cut-to-length sheets
Available standards: ASTM, JIS, EN, GB, DIN, ISO, ASME
Certification: EN 10204 3.1 or 3.2 mill test certificate

Chemical Composition and Mechanical Properties

YS STEEL supplies Hot Rolled Steel Coils in a broad portfolio of grades to satisfy international standards. The table below lists the typical chemical composition and mechanical properties of our most commonly ordered grades. Values shown are representative and may be adjusted according to specific standard requirements or customer specifications.

Table 1: Chemical Composition and Mechanical Properties of Common Grades

Grade	C max (%)	Si max (%)	Mn max (%)	P max (%)	S max (%)	Yield Strength min (MPa)	Tensile Strength (MPa)	Elongation min (%)
Q195	0.12	0.30	0.50	0.035	0.040	195	315–430	33
Q235B	0.20	0.35	1.40	0.045	0.045	235	370–500	26
Q355B	0.24	0.55	1.60	0.035	0.035	355	470–630	22
SS400	0.20	0.30	1.40	0.050	0.050	245	400–510	17
ASTM A36	0.25	0.40	0.80–1.20	0.040	0.050	250	400–550	20
S235JR	0.17	0.35	1.40	0.035	0.035	235	360–510	24
S275JR	0.21	0.35	1.50	0.035	0.035	275	410–560	23
S355JR	0.24	0.55	1.60	0.035	0.035	355	470–630	22
SPHC	0.15	0.30	0.60	0.035	0.035	—	270 min	27
SAE 1006	0.08	0.10	0.45	0.030	0.035	180	280–350	30

For high-strength structural applications, YS STEEL can also produce grades such as Q420, Q460, S420MC, S460MC, ASTM A572 Grade 50, and API line pipe grades. Please contact our technical sales team for detailed material certificates and property data.

Dimensional Tolerances and Surface Finish

Controlling dimensional accuracy is critical for downstream processing. YS STEEL hot rolled steel coils are produced with tight tolerances in accordance with ASTM A568, EN 10051, JIS G3193, and GB/T 709 standards. The following table provides general tolerance ranges for our standard production. Customized tighter tolerances are available on request.

Table 2: General Dimensional Tolerances

Thickness Range (mm)	Width Tolerance (mm)	Thickness Tolerance (mm)	Camber (mm per 2,000 mm)	Flatness (mm)
1.2 – 2.0	0 / +10	±0.10	≤ 5	≤ 8
2.0 – 4.0	0 / +10	±0.13	≤ 5	≤ 8
4.0 – 8.0	0 / +15	±0.20	≤ 8	≤ 10
8.0 – 15.0	0 / +20	±0.30	≤ 10	≤ 12
15.0 – 25.4	0 / +25	±0.40	≤ 12	≤ 15

Table 3: Surface Finish and Edge Options

Surface Finish	Description	Typical Applications
Black (Mill Finish)	Oxide scale remains from hot rolling; economical finish	General structural steel, welded pipes, storage tanks
Pickled and Oiled	Scale removed by acid pickling; light oil film prevents rust	Automotive components, stamping, cold rolling feedstock
Dry	Pickled with no oil applied; surface ready for immediate painting	Pre-painted steel, sheet metal fabrication
Skin Passed	Light cold reduction after pickling for improved surface and flatness	High-quality stamping, exposed panels, furniture

Edge conditions include mill edge, which retains the natural rounded edge formed during hot rolling, and trimmed edge, where the edges are cut to exact width with close tolerances. Trimmed edge is recommended for applications that require precise width control and improved weld quality.

Manufacturing Process

YS STEEL uses a fully automated hot strip mill with advanced process control systems to ensure consistent product quality. The manufacturing process consists of the following stages:

Slab preparation: Continuously cast steel slabs are inspected for surface and internal quality before being charged into the reheating furnace.
Reheating: Slabs are heated to 1,200°C – 1,300°C in a walking beam furnace to achieve uniform temperature distribution.
Primary descaling: High-pressure water jets remove the primary scale formed during reheating.
Roughing mill: The slab is reduced from approximately 200 mm thickness to a transfer bar thickness of 25–35 mm through several roughing passes.
Finishing mill: The transfer bar passes through a six-stand tandem finishing mill where it is reduced to the final target thickness, typically between 1.2 mm and 25.4 mm.
Laminar cooling: The hot strip is cooled on a run-out table using controlled water curtains to achieve the required microstructural and mechanical properties.
Coiling: The strip is coiled at a target coiling temperature between 500°C and 650°C, depending on grade and thickness.
Inspection and marking: Each coil is inspected for dimensional accuracy, surface defects, and mechanical properties. Coils are then strapped, marked with heat numbers, and prepared for storage or shipment.

This controlled process allows YS STEEL to produce hot rolled steel coil with consistent mechanical properties and surface quality, reducing waste and improving productivity for our customers.

Applications

Hot rolled steel coil remains one of the most versatile materials used in modern industry. The products from YS STEEL support a broad range of applications, including but not limited to:

Construction and infrastructure: Structural beams, columns, floor decking, purlins, guardrails, bridge components, and welded pipes
Automotive and transportation: Chassis members, wheel rims, brackets, reinforcing plates, trailer frames, and truck bodies
Pipe and tube manufacturing: Spiral welded pipes, ERW pipes, hollow structural sections, scaffolding tubes, and casing pipes
Machinery and equipment: Agricultural machinery, cranes, mining equipment, conveyor frames, and heavy-duty structural components
Shipbuilding and marine: Hull plates, deck plating, bulkheads, and other structural elements
Energy and power: Transmission towers, wind turbine flanges and towers, pressure vessel shells, and storage tanks
General fabrication: Racking systems, containers, gates, fences, and industrial furniture

Because hot rolled steel coil offers a good balance between strength, formability, and cost, it is often the first choice for applications that do not require the tight tolerances or smooth surface of cold rolled products.

Quality Control and Certifications

Quality assurance is an integral part of YS STEEL production. Every hot rolled steel coil is tested and documented before shipment. Our quality management system is certified to ISO 9001:2015, environmental management to ISO 14001:2015, and occupational health and safety to ISO 45001:2018. In addition, our products meet the requirements of CE marking under EN 10025 and can be supplied with a mill test certificate according to EN 10204 3.1 or EN 10204 3.2.

Typical inspection items include:

Visual surface inspection for scale, cracks, lamination, and other defects
Dimensional measurement of thickness, width, and crown using laser and X-ray gauges
Chemical analysis using optical emission spectrometry for each heat
Tensile testing per ASTM E8 / ISO 6892-1 to verify yield strength, tensile strength, and elongation
Impact testing per ISO 148-1 or ASTM E23 for grades requiring toughness at low temperatures
Bend testing to evaluate formability
Hardness testing when required

Frequently Asked Questions

Q: What is the difference between hot rolled steel coil and cold rolled steel coil?

A: Hot rolled steel coil is processed at temperatures above the recrystallization point of steel, typically above 926°C. This results in a scaled surface, looser dimensional tolerances, and lower cost compared to cold rolled steel. Cold rolled steel is produced by further processing hot rolled strip through pickling and cold reduction at room temperature, which gives a smoother surface, tighter thickness tolerances, and improved mechanical properties. Hot rolled coil is generally preferred for structural and fabrication applications, while cold rolled coil is used for precision parts, automotive panels, and appliances requiring smooth surface finish.

Q: What thickness range does YS STEEL supply for Hot Rolled Steel Coils?

A: YS STEEL supplies hot rolled steel coil in thicknesses from 1.2 mm to 25.4 mm as standard. For certain grades and applications, thinner or thicker material can be discussed on a case-by-case basis. Widths range from 600 mm to 2,000 mm, with custom width options available up to 2,200 mm. Our technical team can recommend the optimal thickness and width combination for your specific manufacturing process.

Q: Can you provide pickled and oiled hot rolled steel coil?

A: Yes, YS STEEL offers hot rolled coil with pickled and oiled surface treatment. In this process, the hot rolled coil is passed through a continuous pickling line where hydrochloric acid removes the oxide scale. After rinsing and drying, a light anti-rust oil is applied to protect the surface from corrosion during storage and transit. Pickled and oiled hot rolled coil is suitable for stamping, cold forming, and as feedstock for cold rolling. We also offer dry and skin passed options based on downstream processing requirements.

Q: Can YS STEEL provide custom slitting or cut-to-length services for hot rolled steel coil?

A: Yes, YS STEEL provides value-added processing services including slitting, cut-to-length, and stretcher leveling. Slit coils can be produced to narrow widths from 30 mm and above with tight width tolerances. Cut-to-length sheets are available in lengths from 1,000 mm to 12,000 mm. These services help reduce downstream processing costs and improve material utilization for manufacturers and fabricators. Please specify your required slit widths or sheet dimensions when requesting a quotation.

Q: What is the typical coil weight and inner diameter?

A: YS STEEL hot rolled steel coils are typically supplied with an inner diameter of 508 mm (20 inches) or 610 mm (24 inches). Coil weight can range from 3 metric tons to 30 metric tons per coil, depending on the strip thickness, width, and outer diameter limitations. Standard outer diameter ranges from 1,000 mm to 2,200 mm. If you have specific coil weight limits due to downstream equipment or crane capacity, we can adjust the coil size accordingly within the allowable range.