Rolling Characteristics of Alloy Structural Steel
Alloy structural steel is a kind of steel with certain alloy elements added. It is featured by higher strength, hardness and wear resistance than common carbon steel, higher dimensional accuracy and machining performance. The rolling process is an important process for alloy structural steel production, which directly affects the production cycle, mechanical properties, machinability and dimensional accuracy of the product. Therefore, it is very important to optimized rolling according to the characteristics of different alloy structural steels.
In the rolling process of alloy structural steel, the temperature of heating furnace should be appropriate and continuously adjustable. On the one hand, the heating temperature must be higher than the recrystallization temperature of the steel, so as to make the material in a state of recrystallization, have good plastic deformation performance and the organization will not be coarse and brittle; on the other hand, the temperature should not be too high, otherwise the grain growth will be too coarse and the subsequent rolling quality will be affected. Generally, the heating temperature should not exceed the critical temperature of grain growth, otherwise the rolling quality of the subsequent deformation will be affected.
The shape of roll of rolling mill determines the shape and size of product.In the hot rolling process of alloy structural steel, the choice of roll must be appropriate. The bending parts of the roll shall be properly treated for quenching and tempering, which can improve the wear resistance and fatigue strength of the roll, reduce the failure caused by fracture of the roll, and ensure the quality of the product. In addition, in order to improve the performance of the product, proper lubrication and cooling measures should be taken during the rolling process, so as to reduce energy consumption of rolling and avoid overheating during the rolling process, which will damage the mechanical properties and surface quality of the product.
The rolling process of alloy structural steel affects its mechanical properties. Therefore, the rolling process parameters should be reasonably determined according to the alloy elements, specifications and requirements of the product. Generally speaking, in the rolling process of alloy structural steel, the overload rate is proportional to the strength of the material, but too large overload rate will cause coarse grain and poor plastic deformation performance. Therefore, the essence of rolling process parameters is to optimize the deformation structure and grain size of materials, improve the mechanical properties and surface quality of products in a short time, and reduce energy consumption.
In short, the rolling characteristics of alloy structural steel must be considered in production. The most important is to determine the reasonable rolling parameters according to the material properties, ensure the heating temperature and roll selection, take appropriate cooling and lubrication measures, and take shape and size control measures to ensure the quality of products.
