Ingots or billets are difficult to deform and process at room temperature. They are usually heated to 1100 ~ 1250 ℃ for rolling. This rolling process is called hot rolling. The temperature of hot rolled plate is high, so the deformation resistance is small, and large deformation can be achieved. Taking the rolling of steel plate as an example, the thickness of continuous casting slab is generally about 230mm, while after rough rolling and finish rolling, the final Z thickness is 1~20mm. At the same time, because the width thickness ratio of the steel plate is small, and the requirements for dimensional accuracy are relatively low, the shape problem is not easy to occur, and the convexity is mainly controlled. For the structure requirements, it is generally realized by controlled rolling and controlled cooling, that is, the microstructure and mechanical properties of the strip are controlled by controlling the start rolling temperature, final rolling temperature and crimp temperature of the finish rolling.

Production process

Types and applications of hot rolled steel plate

1. Structural steel

It is mainly used in the production of steel structures, bridges, ships and vehicles.

2. Weathering steel

Special elements (P, Cu, C, etc.) are added, which have good corrosion resistance and atmospheric corrosion resistance. They are used in the production of containers, special vehicles and building structures

3. Automotive structural steel

High strength steel plates with good stamping and welding properties are used in the production of automobile frame, wheel, etc.

4. Hot rolled special steel

Carbon steel, alloy steel and tool steel for general mechanical structures are used for the production of various mechanical parts after heat treatment engineering.

5. Cold rolled stock

It is used to produce various cold rolled products, including Cr, GI, color coated sheet, etc.

6. Steel plate for steel pipe

With good processability and compressive strength, it is used to produce high-pressure gas pressure vessels filled with LPG, acetylene and various gases below 500L.

7. Steel plates for high pressure vessels

With good processability and compressive strength, it is used to produce high-pressure gas pressure vessels filled with LPG, acetylene and various gases below 500L.

8. Stainless steel plate

Stainless steel has good corrosion resistance and is mainly used in food industry, surgical equipment, aerospace, petroleum, chemical industry and other industries.