Reheating Furnace for Hot Strip Rolling

Product Specifications

Technical details and manufacturing context for Reheating Furnace

Definition

The Reheating Furnace is a critical component within the Integrated Hot Strip Rolling and Finishing System. Its primary function is to uniformly reheat cold or semi-finished steel slabs to precise temperatures, typically in the range of 1100–1300°C, as required for subsequent hot rolling operations. This heating process ensures proper metallurgical properties and surface quality of the final strip. The furnace operates by combusting fuels such as natural gas or oil, or by electric heating, to transfer thermal energy to the slabs through radiation, convection, and conduction. Precise temperature control zones and atmosphere management are employed to prevent oxidation and scale formation. The furnace is designed to handle slabs with thicknesses from 150 to 300 mm, widths from 600 to 2200 mm, and lengths from 4000 to 12000 mm, depending on the specific mill configuration. Typical furnace dimensions include lengths of 20–60 m, widths of 6–15 m, and heights of 3–6 m. Rated capacity ranges from 100 to 300 t/h, with discharge temperatures of 1150–1280°C and temperature uniformity of ±10 to ±20°C across the slab. Heating rates vary from 5 to 15°C/min, and thermal efficiency is typically 60–75% with recuperative burners. Fuel consumption is 1.2–1.8 GJ per ton of steel. The furnace requires electrical power of 500–2000 kW for fans, drives, and controls. Materials used include refractory lining, steel casing, ceramic fiber insulation, and heat-resistant alloy components. For any specific application, it is essential to verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The reheating furnace transfers thermal energy to steel slabs primarily through radiation, convection, and conduction. Fuel combustion (natural gas or oil) or electric heating generates heat, which is distributed within the furnace. Slabs are moved through the furnace using walking beam or pusher mechanisms, allowing for controlled heating. Temperature control zones maintain precise thermal profiles, while atmosphere management minimizes oxidation and scale formation. The heating rate and uniformity are critical to achieving the desired metallurgical properties.

Common Materials

Refractory lining, Steel casing, Ceramic fiber insulation, Heat-resistant alloy components

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Capacity	100–300 t/h	Typical for hot strip mills
Discharge Temperature	1150–1280 °C	Required for rolling
Temperature Uniformity	±10–±20 °C	Across slab length and width
Heating Rate	5–15 °C/min	Depends on slab thickness and grade
Thermal Efficiency	60–75 %	Higher with recuperative burners
Fuel Consumption	1.2–1.8 GJ/t	Per ton of steel
Slab Thickness	150–300 mm	Standard range
Slab Width	600–2200 mm	Typical for hot strip mills
Slab Length	4000–12000 mm	Depending on furnace design
Furnace Length	20–60 m	Walking beam or pusher type
Furnace Width	6–15 m	Internal width
Furnace Height	3–6 m	Internal height
Electrical Power	500–2000 kW	For fans, drives, and controls

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Burners
Provide controlled combustion of fuel to generate heat

Material: Heat-resistant alloy steel
Refractory Lining Part
Insulate furnace structure and withstand high temperatures

Material: Firebrick, ceramic fiber
Charging/Discharging System
Mechanism to load and unload steel slabs

Material: Steel, heat-resistant alloys
Temperature Control System
Monitor and regulate furnace temperature zones

Material: Electronic components, sensors
Waste Heat Recovery System
Capture and reuse exhaust heat for energy efficiency

Material: Steel, heat exchangers
Walking Beam Mechanism
Steps the slabs through the furnace zones so each one gets its full soak time.
Atmosphere Control
Holds the furnace atmosphere so the slab surface does not over-oxidize and form scale.

Manufacturers of Reheating Furnace

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

China Firebrick

Henan, CN

Also makes: Electromagnetic Induction Heater, Continuous Casting Mold Powder, Molten Metal Flow Control Nozzle and 3 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Wanhao Refractory

Beijing, CN

Also makes: Electric Arc Furnace, Electromagnetic Induction Heater, Molten Metal Flow Control Nozzle and 3 more

Listed on the company's own website · profile compiled by CNFX from public sources

View profile Send enquiry

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Frequently Asked Questions

What is the typical capacity range of a reheating furnace?

The rated capacity typically ranges from 100 to 300 tons per hour, depending on the furnace design and mill requirements.

What discharge temperatures are required for hot rolling?

Discharge temperatures typically range from 1150°C to 1280°C, ensuring proper metallurgical properties for rolling.

How is temperature uniformity maintained?

Temperature uniformity is maintained within ±10 to ±20°C across the slab length and width using multiple control zones and precise atmosphere management.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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capacity:	50 to 500 tons per hour (slab throughput)
pressure:	Atmospheric to 1.5 bar (combustion system dependent)
temperature:	800°C to 1300°C (typical steel reheating range)
heating rate:	50°C to 150°C per hour (slab dependent)

Reheating Furnace

Product Specifications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards