Cast iron rolls

Cast iron rolls in the carbon content of 2.5% -3.5% or so, according to the main material can be divided into ordinary cast iron rolls, high nickel-chromium infinite cold hardened composite cast iron rolls, high chromium composite cast iron rolls and alloy ductile iron rolls of four categories. Cast iron rolls in the common organization can be divided into the matrix, carburite, graphite three categories, the matrix organization of the main clathrate, ferrite, pearlite, bainite and martensite, graphite in the cast iron in the form of general flake and spherical two:


1, ordinary cast iron rolls
Ordinary cast iron rolls can be divided into cold hard cast iron rolls, medium and low alloy unlimited cold hard cast iron rolls, medium and low alloy ductile iron rolls, cold hard cast iron is the use of the iron itself subcooling and mold surface cooling methods to obtain a cast iron roll surface cooling and generate white layer, high hardness, good wear resistance. Cold hard cast iron roll according to the manufacturing process and core material can be divided into non-ductile iron, ductile composite, and ball core three categories. Infinite cold hard cast iron roll is between cold hard cast iron and grey cast iron between a material, the working layer of its roll body matrix organization in the presence of graphite, and the working layer of the roll body and the core has no obvious demarcation line, rubber roll is this low-end roll. Ordinary cast iron rolls are mainly used for stacked thin plate mill, three-roll Lauter-type plate mill, wire rod mill, bar mill and section steel mill rolls.
2, high nickel-chromium infinite cold hard cast composite iron rolls
Infinite cold hard cast iron is bounded in the cold hard cast iron and gray cast iron between a material, infinite cold hard cast iron roll body working layer set matrix organization there is a uniform distribution of graphite, graphite content from the surface of the roll body to the inside with the increase in depth and improve the hardness decreases, therefore, the working layer of the roll body and the core has no obvious demarcation line, also known as the infinite cold cast iron roll roll infinite cold cast iron roll material contains a high level of chromium, nickel, molybdenum and other materials. The material contains high chromium, nickel, molybdenum alloying elements for high nickel-chromium infinite chilled cast iron rolls, using the full flush (overflow method) or centrifugal composite casting process production.


3, high chromium composite cast iron rolls
High-chromium composite cast iron roll is to contain chromium 12-22% of high-chromium white wear-resistant cast iron for the roll body outer material, generally ductile iron for the roll core and roll neck material, using centrifugal composite casting process and the production of high-alloy composite cast iron roll. High chrome cast iron rolls have excellent wear resistance, are widely used as hot strip mill roughing and finishing mill front work rolls, wide and medium thick plate mill roughing and finishing work rolls and small section steel and plate mill finishing.

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