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Preparation method of hypereutectic high chromium cast iron

A high-chromium cast iron and hypereutectic technology, applied in the field of wear-resistant materials, can solve the problems of high brittleness, easy cracking, and restrictions on the popularization and application of hypereutectic high-chromium cast iron, and achieve excellent wear resistance, low production cost, and easy The effect of mass production

Inactive Publication Date: 2015-08-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in hypereutectic high chromium cast iron, due to the large amount of carbides and high brittleness, it is easy to crack during casting and use, which limits the popularization and application of hypereutectic high chromium cast iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Adopt 750 kilograms of intermediate frequency induction furnaces to smelt hypereutectic high chromium cast iron of the present invention, concrete preparation method is as follows:

[0018] (1) Firstly, the hypereutectic high chromium cast iron molten iron was smelted in a 750 kg medium frequency induction furnace. The chemical composition and mass fraction of the hypereutectic high chromium cast iron molten iron were 4.02%C, 25.17%Cr, 0.76%Si, 1.49%Mn , 0.084%N, 0.055%Al, 0.031%S, 0.040%P, balance Fe;

[0019] (2) When the temperature of the above-mentioned hypereutectic high-chromium cast iron molten iron reaches 1549°C, the molten iron is taken out of the furnace and put into the ladle, and then the diameter The alloy wire is sent into the molten iron in the ladle. The distance between the alloy wire and the bottom of the ladle is 15mm. The amount of alloy wire added accounts for 5.5% of the mass fraction of the molten iron in the ladle. The chemical composition and m...

Embodiment 2

[0023] Adopt 750 kilograms of intermediate frequency induction furnaces to smelt hypereutectic high chromium cast iron of the present invention, concrete preparation method is as follows:

[0024] (1) Firstly, the hypereutectic high chromium cast iron molten iron is smelted in a 750 kg medium frequency induction furnace. The chemical composition and mass fraction of the hypereutectic high chromium cast iron molten iron are 4.27%C, 27.95%Cr, 0.33%Si, 1.20%Mn , 0.148%N, 0.087%Al, 0.028%S, 0.046%P, balance Fe;

[0025] (2) When the temperature of the above-mentioned hypereutectic high-chromium cast iron molten iron reaches 1523°C, the molten iron is taken out of the furnace and put into the ladle, and then the diameter The alloy wire is fed into the molten iron in the ladle. The distance from the alloy wire to the bottom of the ladle is 35mm. The amount of alloy wire added accounts for 4.0% of the mass fraction of the molten iron in the ladle. The chemical composition and mass f...

Embodiment 3

[0029] Adopt 750 kilograms of intermediate frequency induction furnaces to smelt hypereutectic high chromium cast iron of the present invention, concrete preparation method is as follows:

[0030] (1) Firstly, the hypereutectic high chromium cast iron molten iron was smelted in a 750 kg intermediate frequency induction furnace. The chemical composition and mass fraction of the hypereutectic high chromium cast iron molten iron were 4.14%C, 26.50%Cr, 0.65%Si, 1.34%Mn , 0.128%N, 0.091%Al, 0.035%S, 0.037%P, balance Fe;

[0031] (2) When the temperature of the above-mentioned hypereutectic high-chromium cast iron molten iron reaches 1530°C, the molten iron is taken out of the furnace and put into the ladle, and then the diameter The alloy wire is fed into the molten iron in the ladle. The distance between the alloy wire and the bottom of the ladle is 25mm. The amount of alloy wire added accounts for 5.0% of the mass fraction of the molten iron in the ladle. The chemical compositio...

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PUM

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Abstract

The invention discloses a hypereutectic high-chromium iron preparation method belonging to the technical field of wear-resistant materials. Molten hypereutectic high-chromium iron comprises the following chemical components in percent by weight: 4.0-4.3 percent of C, 25.0-28.0 percent of Cr, 0.3-0.8 percent of Si, 1.2-1.5 percent of Mn, 0.08-0.15 percent of N, 0.05-0.10 percent of Al, less than 0.04 percent of S, less than 0.05 percent of P, and the balance of Fe. When the temperature of the molten iron reaches 1520-1550 DEG C, the molten iron is discharged and then fed in a casting ladle. Then an alloy wire with a diameter phi of 3.0-5.5 mm into the molten iron in the casting ladle by using a wire feeding machine, wherein the addition amount of the alloy wire accounts for 4.0-5.5 percent that of the molten iron in the casting ladle; pouring the molten iron in a mould to obtain a casting, and quenching and tempering the casting so that better mechanical property and abrasive resistance are obtained.

Description

technical field [0001] The invention relates to a preparation method of high-chromium cast iron, in particular to a preparation method of hypereutectic high-chromium cast iron with relatively high carbon and chromium content, and belongs to the technical field of wear-resistant materials. Background technique [0002] High chromium cast iron is a kind of excellent wear-resistant material, which has been widely used in industrial production. A large number of studies have found that increasing the carbide volume fraction in high-chromium cast iron can improve the wear resistance of high-chromium cast iron. In this context, the development and application of hypereutectic high-chromium cast iron with high carbon and chromium content has been paid attention to. Chinese invention patent CN102925783A discloses a method for preparing hypereutectic high-chromium white cast iron, which is characterized in that it includes the following steps: Step 1: Using scrap steel, pig iron, hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C22C37/10C21D1/30
Inventor 符寒光王振冯宪章蒋志强李卫刘建伟魏永强刘元朋文振华
Owner BEIJING UNIV OF TECH