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A kind of wear-resistant white cast iron and preparation method thereof

A technology of white cast iron and molten iron, applied in the field of casting, can solve the problems of low strength and toughness of white cast iron, poor safety in use, etc., and achieve the effects of improving performance, reducing production cost and low production cost.

Active Publication Date: 2016-08-24
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned wear-resistant white cast iron still has carbides distributed in large blocks, resulting in low strength and toughness of the white cast iron and poor safety in use

Method used

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  • A kind of wear-resistant white cast iron and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Adopt 750 kilograms of medium-frequency induction furnaces to smelt the wear-resistant white cast iron of the material of the present invention, and its specific preparation process steps are:

[0022] ①Firstly add recarburizer, steel scrap, ferrosilicon, ferroboron, ferrochrome and ferromanganese charge into the 750 kg medium frequency induction furnace, melt the charge in the furnace, and raise the temperature to 1563°C, the chemical composition of the molten iron in the furnace and Its mass fraction is controlled at: 3.19%C, 2.63%Si, 1.25%B, 7.99%Cr, 1.64%Mn, 0.038%S, 0.045%P, the balance is Fe and unavoidable impurities, and then the molten iron is taken out to pour Ladle, during the process of molten iron entering the ladle, the master alloy is added with the molten iron flow, the particle size of the master alloy is 40-65mm, the amount of master alloy added accounts for 3.0% of the mass fraction of the molten iron in the ladle, and the master alloy is composed of f...

Embodiment 2

[0026] Adopt 1000 kilograms of medium-frequency induction furnaces to smelt the material wear-resistant white cast iron of the present invention, and its specific preparation process steps are:

[0027] ① Firstly, add recarburizer, steel scrap, ferrosilicon, ferroboron, ferrochrome and ferromanganese charge into the 1000 kg medium frequency induction furnace, melt the charge in the furnace, and raise the temperature to 1577°C, the chemical composition of the molten iron in the furnace and Its mass fraction is controlled at: 3.04%C, 2.89%Si, 1.48%B, 7.50%Cr, 1.78%Mn, 0.040%S, 0.047%P, the balance is Fe and unavoidable impurities, and then the molten iron is taken out of the furnace to pour Ladle, during the process of molten iron entering the ladle, the master alloy is added with the molten iron flow, the particle size of the master alloy is 40-65mm, the amount of the master alloy added accounts for 3.5% of the mass fraction of the molten iron in the ladle, and the master alloy ...

Embodiment 3

[0031] Adopt 500 kilograms of medium-frequency induction furnaces to smelt the wear-resistant white cast iron of the material of the present invention, and its specific preparation process steps are:

[0032] ① First add recarburizer, steel scrap, ferrosilicon, ferroboron, ferrochrome and ferromanganese charge into a 500 kg intermediate frequency induction furnace, melt the charge in the furnace, and raise the temperature to 1574°C, the chemical composition of molten iron in the furnace and Its mass fraction is controlled at: 3.14% C, 2.75% Si, 1.38% B, 7.71% Cr, 1.70% Mn, 0.042% S, 0.044% P, the balance is Fe and unavoidable impurities, and then the molten iron is taken out of the furnace to pour Ladle, during the process of molten iron entering the ladle, the master alloy is added along with the molten iron flow. The particle size of the master alloy is 40-65mm. The amount of master alloy added accounts for 3.2% of the mass fraction of the molten iron in the ladle. (the chem...

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Abstract

The invention discloses wear-resisting white cast iron and a preparation method thereof, and belongs to the technical field of casting. The preparation method comprises the following steps: adding a recarbonizer, waste steel, silicon iron, ferroboron, ferrochrome and ferromanganese furnace charge into a medium-frequency induction electric furnace, melting the furnace burden in the furnace, rising the temperature to 1560-1580 DEG C, and controlling chemical components of molten iron in the furnace to be as follows in mass friction: 3.0-3.2% of C, 2.6-2.9% of Si, 1.2-1.5% of B, 7.5-8.0% of Cr, 1.6-1.8% of Mn, less than 0.05% of S, less than 0.05% of P and the balance of Fe and inevitable impurities; and then, processing the molten iron with an intermediate alloy, an aluminum iron block and an alloy wire, and casting the molten iron into a cast piece. After being quenched and tempered, the wear-resisting white cast iron has characteristics of high mechanical performances, good wear resistance, and the like.

Description

technical field [0001] The invention discloses white cast iron and a preparation method thereof, in particular relates to a wear-resistant white cast iron and a preparation method thereof, belonging to the technical field of casting. Background technique [0002] White cast iron exhibits excellent wear resistance because it contains more high-hardness carbides, but ordinary white cast iron has a coarse structure, especially the carbides are brittle, and are prone to fracture during use. In order to improve the performance of white cast iron, Chinese invention patent CN 102899469 discloses a heat treatment method of high chromium wear-resistant cast iron Cr28. In this invention, the high-chromium wear-resistant white cast iron Cr28 is heated to 1000-1050°C, heated and kept for 1.5-3h, and then air-cooled to room temperature; then heated to 710-730°C, tempered for 1.5-2h, and air-cooled to room temperature; Carry out the second quenching and the low-temperature tempering twic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/08
Inventor 蒋志强符寒光卢洪波冯锡兰魏永强刘元朋魏永辉刘建伟文振华王振冯宪章
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS