How are rolls classified according to raw materials in the eyes of roll manufacturers?

Roll is the main working part and thing that causes continuous plastic deformation of metal on the rolling mill. The roll is mainly composed of roll body, roll neck and shaft head. Today, let the roll manufacturer Wuxi Taihu roll Xiaobian bring you an explanation of how the rolls are classified according to the raw materials.

According to the roll manufacturer, the roll is mainly divided into three categories: cast iron roll, cast steel roll and forged steel roll. Meanwhile, the carbon content of cast iron roll is 2 50 / 0 ~ 3.5%. According to the primary raw materials, it can be divided into four categories: chilled cast iron roll, infinite chilled cast iron roll, high chromium cast iron roll and nodular cast iron roll. The common arrangement in cast iron roll can be divided into three categories: matrix, cementite and graphite. The matrix arrangement mainly includes austenite, ferrite, pearlite, bainite and martensite. The shape of graphite in cast iron generally includes flake and spherical.

Cast steel roll can be divided into two types: steel roll (carbon content 0.4% ~ 114%) and semi steel roll (carbon content 1.4% ~ 2.40 / 0). Steel roll has low carbon content, so its hardness is low. Its arrangement is generally composed of ferrite and pearlite. With the addition of carbon content, the amount of ferrite is reduced and the amount of pearlite is added. In order to advance the hardness, alloy elements such as chromium, nickel, manganese, molybdenum and vanadium can be added, or special heat treatment can be carried out. Because the steel roll has high tensile strength and resistance, it is suitable for the billet rolling mill or blooming mill with high rolling temperature and large rolling load, and can also be used as the support roll. If special heat treatment is carried out to obtain high hardness above hs90, it can also be used as cold rolling operation roll.

The carbon content of semi steel roll is between cast steel roll and cast iron roll, and its hardness is higher than that of general cast steel roll and lower than that of cast iron roll. The primary feature of semi steel roll is that the internal hardness drop is very small. Therefore, it is especially suitable for making deep hole roll. If silicon content is added to the raw material of semi steel roll, after graphitization treatment, it has high thermal crack resistance and strong resistance. As the blooming roll of blooming mill, the coarse roll of large section steel, the roll of blooming continuous mill and the vertical roll of hot strip continuous mill, it can obtain excellent rolling effect.

The forged steel roll is tempered, cast and heat treated to make the working layer of the roll body have high hardness, high wear resistance and good accident resistance, so as to ensure that the roll neck and roll body core have certain strength and high endurance. This common function of forged steel roll makes it have irreplaceable advantages in cold rolling and nonferrous rolling.

OK, the above is a brief introduction to the classification of rolls according to raw materials. If you want to know more about the roll manufacturer, please pay attention to the roll manufacturer Wuxi Taihu roll Xiaobian.