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High Chromium Cast Iron Improves Hardness and Strength

• Posted by wearresistant William April 14, 2020 Filed in Arts & Culture #high chrome white iron castings  337 views
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  Do you know two kinds of wear-resistant cast iron commonly used in foundry and their characteristics?

  Chilled cast iron and wear-resistant alloy cast iron are two kinds of wear-resistant cast iron materials commonly used in foundry production.

  Chilled cast iron is also called chilled cast iron. It is obtained by placing chilled iron in the casting mold to accelerate the cooling speed of the casting. The typical chemical compoSition of chilled cast iron is: c content 3% ~ 3.5%, si content 0.5% ~ 0.7%, Mn content 0.5% ~ 0.7%, p content < 0.4%, s content < 0.07%.

  Cold hard cast iron is characterized by whitening of the surface part, greatly improved hardness and wear resistance, and retained gray structure inside to prevent overall embrittlement. Hardness of chilled surface reaches HRC60 or so.

  Chilled nickel chromium cast iron is also a case in point. The Ni content of chilled Ni-Cr cast iron is 4% and Cr content is 1.1%. Ni refines pearlite and graphite, increasing the strength and wear resistance of cast iron. Adding Ni can also improve thermal strength. The hardness of chilled nickel chromium cast iron can reach HRC60, which is commonly used to manufacture grinding rollers.

  High chromium cast iron is high temperature wear resistant cast iron, and its typical composition is: Cr content 22% ~ 25%, Si content 1.2%, Mn content 0.3% ~ 0.75%. The addition of Cr can improve the wear resistance of cast iron because Cr can form a dense protective film Cr2O3 on the surface of the casting. The addition of Cr also generates carbides, which improves the hardness and strength of cast iron. High chromium cast iron can be used to make wear-resistant parts that work at temperatures above 800℃.

  Shenyang Gongda Heavy Equipment Manufacturing Co., Ltd. is a professional manufacturer and supplier of High Chrome White Iron Castings. for details, please consult: Abrasion Resistant Castings.