How are rolls categorized by material?


Release time:

2023-03-01

Roller according to the material is mainly divided into cast iron rolls, cast steel rolls and forged steel rolls three categories. Among them, the carbon content of cast iron rolls in 2. 50/0 ~ 3.5% or so, according to the main material can be divided into cold cast iron rolls, unlimited cold cast iron rolls, high chromium cast iron rolls and ductile iron rolls four categories. Cast iron rolls in the common organization can be divided into the matrix, carburizing body, graphite three categories, the matrix organization is mainly austenite, ferrite, pearlite, bainite and martensite, graphite in the cast iron in the form of general flake and spherical two.

Roller according to the material is mainly divided into cast iron rolls, cast steel rolls and forged steel rolls three categories. Among them, the carbon content of cast iron rolls in 2. 50/0 ~ 3.5% or so, according to the main material can be divided into cold cast iron rolls, unlimited cold cast iron rolls, high chromium cast iron rolls and ductile iron rolls four categories. Cast iron rolls in the common organization can be divided into the matrix, carburizing body, graphite three categories, the matrix organization is mainly austenite, ferrite, pearlite, bainite and martensite, graphite in the cast iron in the form of general flake and spherical two.

Cast steel rolls can be divided into two categories: steel rolls (carbon content of 0. 4% ~ 114%) and semi-steel rolls (carbon content of 1. 4% ~ 2.40/0), steel rolls with low carbon content, so the hardness is low, and its organization is generally composed of ferrite and pearlite, with the increase in carbon content, the amount of ferrite decreases, the amount of pearlite increases. In order to improve the hardness, can add chromium, nickel, manganese, molybdenum, vanadium and other alloying elements, or special heat treatment. Due to the high tensile strength and toughness of steel rolls, they are suitable for open billet mills or primary mills with high rolling temperature and high rolling load, and can also be used as support rolls. Such as special heat treatment, to get HS90 above the high hardness, can also be used as cold rolling work roll.

Semi-steel roll carbon content in the cast steel rolls and cast iron rolls, its hardness is higher than the general cast steel rolls, lower than the cast iron rolls. Semi-steel rolls is the most important feature of the internal hardness landing is very small, therefore, especially suitable for the manufacture of deep hole type rolls. Semi-steel roll material, if you increase the silicon content, through the graphitization process, has a high resistance to thermal cracking and toughness, as the initial mill open billet rolls, large steel roughing rolls, open billet rolling mill rolls and hot strip mill stand rolls, you can get good rolling results.

Forged steel rolls through smelting, forging, heat treatment, so that the working layer of the roll body has a high hardness, high wear resistance and excellent resistance to accidents, and at the same time to ensure that the roll neck and the core of the roll body has a certain strength and high toughness. Forged steel rolls have this unique performance, making it in cold rolling and non-ferrous rolling, with casting rolls irreplaceable advantages.


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