High Chromium Cast Iron
High chromium cast iron is the third generation of white cast iron developed from ordinary white cast iron and hard nickel cast iron.The chromium content of high chromium white cast iron is more than 11%, and the ratio of chromium to carbon is between 4~8.Under these conditions, M7C3 type carbides with high hardness almost completely replace M3C type carbides.The M7C3 type carbides basically exist in an isolated hollow hexagonal shape. Compared with the M3C type carbides, the matrix continuity is greatly enhanced, so the toughness of the whole material is significantly improved.At present, high chromium cast iron is widely used in mining, cement, electric power, road construction machinery and refractory materials.
The chemical composition of high chromium cast iron:
High chromium cast iron (containing 12% chromium >) is an excellent wear resistant material.In the research of high chromium cast iron, generally focus on high chromium cast iron such as Cr15, Cr20.With the increase of Cr content and the addition of various alloying elements, the influence on the change properties of the structure was studied.
The characteristics of high chromium cast iron:
High chromium cast iron has excellent wear resistance and high temperature plasticity, and its wear-resistant parts are widely used in metallurgy, mining, building materials, railway, coal mine, military industry, energy and other fields.But due to the poor impact toughness of high chromium cast iron, in order to make it the best antiwear performance and using effect, is engaged in production of high chromium cast iron foundry workers, constant by adjusting the chemical composition, micro alloying modification, inoculation and so on change the matrix organization, refine the grain, which significantly improves the performance of high chromium cast iron and using effect.
The high temperature strength and high temperature hardness of high chromium cast iron are high, especially in the atmosphere containing chemical components such as SO2 oxidation resistance is very good.Therefore, it is widely used in heat resisting parts of blast furnace, coke oven, sintering furnace and other industrial furnaces.Especially at high temperature, high chromium cast iron also has better physical wear resistance, which is better than high aluminum cast iron.
High chromium cast iron application:
High chromium cast iron as high wear-resistant material, has been effectively used in crushing, grinding, conveying and other mechanical and metallurgical equipment, particularly in the abrasive wear and impact wear of parts (such as crusher roller, bin liners, bell and hopper, blast furnace coal worse lining plate, coal mill roller cover, rolling stick, slurry pump flow components, etc.) is more widely applied.
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