Hot-rolled steel plate
Hot Rolled Coil/Sheet (HRC/HRS) is a steel product manufactured from slab stock—primarily continuous slabs—that is first heated in a furnace to temperatures above the recrystallization range (typically exceeding 1100°C). The heated material is then passed through a roughing mill and finishing mills for rolling, followed by laminar cooling to a specific temperature. Finally, it is coiled into shape using a coiler. Simply put, this type of steel plate is rolled "while hot" at high temperatures, making it one of the most fundamental and critical forms of steel used in the iron and steel industry—and it serves as the essential raw material for further深加工 processes like cold rolling and galvanizing.
Product Categories:
Hot-rolled coil
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Detailed introduction
Key features of the core production process
Its "hot-rolling" process determines its core characteristics:
Heating: The slab is homogenized in a heating furnace to achieve optimal plasticity.
High-pressure descaling: Uses high-pressure water to blast the surface, removing the initial iron oxide scale.
Rolling: Achieves significant plastic deformation effortlessly through multiple passes at high temperatures.
Cooling: The cooling rate and temperature are controlled via a laminar flow cooling system to optimize the material's final mechanical properties, such as strength.
Coiling: Steel coils are formed by a coiler machine.
Key Features and Performance
High strength, excellent toughness:
The hot-rolling process refines the grain structure and eliminates casting defects, resulting in high mechanical strength and excellent toughness—making it ideally suited for structural applications.
Clearly defined surface features:
A layer of blue iron oxide scale naturally forms on the surface after high-temperature rolling, as a result of exposure to air—this is its most distinctive visual feature.
The surface is relatively rough, with slight irregularities, and isn't as smooth as cold-rolled steel.
Large dimensional tolerances:
Since it undergoes high-temperature rolling, there is some "thermal expansion and contraction" after cooling, resulting in less precise control over dimensions like thickness and width compared to cold-rolled steel.
Residual Stress and Flatness:
Uneven cooling can lead to residual stresses within the material, making it prone to slight warping or cambering, and resulting in lower flatness compared to cold-rolled sheets.
Low cost:
The production process is relatively short, with energy consumption and processing costs significantly lower than those of cold rolling and subsequent products—making our prices highly competitive.
Common Grades, Standards, and Specifications
Common grades and standards:
Ordinary carbon structural steel (Q235B): This is China's most commonly used grade—Grade B low-carbon steel with a yield strength exceeding 235 MPa, offering excellent strength and ductility.
High-quality carbon structural steel (SS400): A structural steel with a yield strength exceeding 400 MPa, offering excellent weldability, high strength, and toughness—while also being easy to machine.
Low-alloy high-strength structural steel (Q355B, Q355C): By adding trace amounts of alloying elements to carbon steel, its strength is significantly higher than that of ordinary carbon steel.
Standards followed: China’s GB/T, U.S. ASTM, Japan’s JIS, European EN, Germany’s DIN, and more.
Common specifications:
Thickness: 1.5mm – 25.4mm (commonly found between 2.0mm and 12mm)
Width: 850mm – 2100mm (depending on mill capacity)
Coil weight: 15–30 tons per coil (inner diameter typically 762 mm or 610 mm)
Delivery format: Steel coil or flat sheet after being slit and leveled.
Main application areas
Hot-rolled coil steel, with its high strength and low cost, is the "skeletal" material of national economic development.
Building structures—such as steel-framed houses, bridges, power plants, and factory trusses—are direct raw materials for H-beams and threaded steel bars.
Vehicle Manufacturing: Automotive crossmembers, longitudinal and transverse beams for vehicle bodies, chassis structural components; railway carriages, container panels.
Mechanical Manufacturing: Frames, housings, booms, and other components for mining machinery, agricultural equipment, and heavy-duty vehicles.
Pipeline Transportation: Welded steel pipes (seamless spiral welded pipes, straight-seam welded pipes) used for transporting oil, natural gas, and water.
As a raw material:
After acid pickling, it becomes pickled and annealed (PA) steel, replacing some cold-rolled applications.
After cold rolling, it becomes cold-rolled coil, used in high-end manufacturing.
After hot-dip galvanizing, it becomes hot-dip galvanized coil, used in construction and household appliances.
Product Applications
Home appliance industry
Kitchen Equipment Industry
Amusement Ride Industry
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Automotive industry
Construction industry
Construction Materials Industry
Amusement Ride Industry
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Mechanical Manufacturing Industry
Railway Systems Industry
Pipeline Systems Industry
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