Introduction to Hot Rolled

Hot rolled coil is made of continuous casting slab or priming slab as raw material, heated by step heating furnace, high pressure water descaling into roughing mill, roughing mill through cutting, tail, and then into finishing mill, implementing computer-controlled rolling, after the final rolling laminar cooling (computer-controlled cooling rate) and coiler winding, straight coil.

Hot rolled steel coils are made from semi-finished products that are rolled, annealed and reduced to a certain thickness and rolled into coils. Hot rolled steel is used to manufacture pipes, steel doors and tanks or further processed into cold rolled steel.

Hot-dip galvanized steel coils are available with a pure zinc coating through the hot-dip galvanizing process. It offers the economy, strength and formability of steel combined with the corrosion resistance of zinc. The hot-dip process is the process by which steel gets coated in layers of zinc to protect against rust. It's especally useful for countless outdoor and industrial applications.

They are mainly used in building roof, door, window, roller shutter doorand automobile's vehicle shell, chassis, door, trunk lid, Oil tank, and fender, and also electric equipments, such as refrigerator base and shell and so on.

Hot Rolled Steel Sheet & Coil Applications 

Hot rolled steel sheet and coil are basic carbon steel products commonly used for applications in which dimensional tolerances and surface finish quality are not critical, such as:

• Agriculture Equipment

• Automobile Accessories

• Automotive Frames

• Construction

• Pipe and Tubular

• Railroad Tracks

• Strappings

• Stampings

• Transportation Infrastructure

Advantages of hot–rolled steel coil 

1) Hot rolling can significantly reduce energy consumption and reduce costs. During hot rolling, the metal has high plasticity and low deformation resistance, which greatly reduces the energy consumption of metal deformation.

2) Hot rolling can improve the processing performance of metals and alloys. The coarse grains in the cast state will be broken, and the significant cracks will heal, reduce or eliminate the casting defects, transform the cast structure into a deformed structure, and improve the processing performance of the alloy.

3) Hot rolling usually adopts large ingots and large reduction rolling, which not only improves the production efficiency but also creates conditions for increasing the rolling speed, realizing the continuity and automation of the rolling process.

Mechanical Properties of Hot–rolled Steel coil

Specifications of Hot-rolled Steel coil 

Common grades of hot-rolled steel coil

• A36
• C1010
• C1018
• A1011
• C1026
• A500
• C1045
• C1141

Application of hot–rolled coil steel

Hot-rolled coil products are widely used in cold-rolled substrates, ships, cars, bridges, construction, machinery, oil pipelines, pressure vessels, etc. due to their excellent strength, good durability, easy processing and outstanding weldability.

FAQ

Will hot–rolled steel rust?

It will rust and is prone to rust.

Is hot or cold rolled steel stronger?

In terms of physical properties, cold-rolled steel is generally harder than hot-rolled steel. Since the metal is formed at a lower temperature, the hardness, tensile resistance and deformation resistance of the steel will increase according to work hardening.