The manufacturing methods of hot-rolled sheets, cold-rolled sheets, and alloy steel plates have their own focuses but also share certain process correlations. The following is a detailed introduction:

I. Manufacturing Method of Hot-Rolled Sheets (Including Hot-Rolled Alloy Sheets)

Hot-rolled sheets are formed by rolling steel billets at high temperatures (thickness usually above 2.0 mm, with some reaching 0.35 mm). The hot-rolling process of alloy steel plates requires additional control of alloying elements.

 

Raw Material Preparation

Select continuous casting billets or initial rolling billets, with the composition determined according to the steel grade (ordinary hot-rolled steel is carbon steel, while alloy steel plates require the addition of alloying elements such as chromium, nickel, molybdenum, and manganese. For example, low-alloy high-strength steel needs to control the content of manganese and vanadium).

Inspect the steel billets to remove surface defects (such as cracks and scars) and ensure uniform composition.

Heating

Send the steel billets into a heating furnace and heat them to 1100–1250°C (austenitizing temperature range) to soften the billets for rolling while ensuring full solid solution of alloying elements in the matrix.

Rolling

Rough Rolling: Roll the heated steel billets through a reversing mill to initially reduce the thickness and adjust the plate shape, forming an intermediate billet (thickness about 10–30 mm).

Finish Rolling: The intermediate billet enters a continuous finishing mill train and is rolled through multiple passes at high temperatures (usually 800–1000°C) to gradually reach the target thickness (such as 1.5–12 mm). Simultaneously control the rolling speed and temperature to ensure uniform mechanical properties of the steel plate.

For alloy steel plates, precisely control the temperature and reduction during rolling to avoid cracks caused by increased rolling resistance due to alloying elements.

 

 

 

 

 

 

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