How Does the Rebar Rolling Mill Roll Section Steel?

A rebar rolling mill is a specialized machine used in the steel industry to roll section steel, specifically reinforcing bars or rebar. The process of rolling section steel in a rebar rolling mill involves several steps, which I'll outline below.

Billet Preparation

The process begins with the preparation of billets, which are long, rectangular bars of steel. These billets are typically produced in a steelmaking plant through processes like casting or hot rolling.

Heating

The billets are heated in a furnace to a high temperature to make them malleable for the rolling process. This temperature is usually above the recrystallization temperature of the steel, which allows for easier deformation.

Reheating

In some cases, if the billets have cooled down during transportation or storage, they may need to be reheated before entering the rolling mill. Reheating is done in a separate furnace to bring the billets back to the required rolling temperature.

Roughing Mill

The reheated billets are then passed through a roughing mill, which is equipped with a series of specially shaped grooved rolls. The roughing mill reduces the thickness and increases the length of the billets. This initial reduction in size is achieved by applying high pressure to the billet as it passes through the grooved rolls.

Intermediate Mill

After the roughing mill, the billets enter the intermediate mill. This mill further reduces the thickness and increases the length of the billets. It consists of a series of stands with grooved rolls arranged in tandem. Each stand applies additional pressure to the billet, gradually shaping it into the desired section.

Finishing Mill

The billets then proceed to the finishing mill, which is the final stage of the rolling process. The finishing mill consists of a set of closely spaced grooved rolls that impart the final shape and dimensions to the section steel. As the billets pass through the finishing mill, they are progressively shaped into the desired cross-sectional profile, such as a round, square, or rectangular shape.

It's important to note that the specific details of the rolling process can vary depending on the design of the rebar rolling mill and the desired properties of the section steel being produced. Different mills may have varying numbers of stands, roll configurations, and automation levels, but the general principles of heating, rolling, cooling, and cutting remain consistent.