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Hypoeutectic high-chromium white cast iron and preparation method thereof

A high-chromium white cast iron and hypoeutectic technology, applied in the field of high-chromium white cast iron, can solve the problems of broken, worn, low impact toughness, etc., and achieve improved hardenability, good casting formability, and crystal nuclei The effect of number increase

Active Publication Date: 2012-01-25
云南化铸科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low impact toughness of the invention, it cannot be used for crushing and abrasion with impact requirements

Method used

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  • Hypoeutectic high-chromium white cast iron and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1, according to principle of the present invention and technical scheme, determine its chemical composition as following table:

[0048] Chemical composition of hypoeutectic high chromium white cast iron (Wt%)

[0049] C Si mn P S Cr V 2.20 0.73 0.6 0.025 0.021 19 0.15 Mo Ni RE Cu Zn Fe 1.2 0.62 0.005 0.6 0.052 margin

[0050] 2. According to the above table, and the components of steel scrap, pig iron, high-carbon ferrochrome, ferromanganese, nickel, molybdenum (selected according to the size of the casting), vanadium, rare earth, and zinc ingot, determine their proportioning relationship and provide the total weight For 100Kg of ingredients.

[0051] 3. Mix scrap steel and pig iron, heat and melt in an intermediate frequency induction furnace, and after the molten iron is melted, add high-carbon ferrochrome, ferromanganese, nickel, and molybdenum in sequence, and then further melt; then, zinc and Rare ear...

Embodiment 2

[0058] 1, according to principle of the present invention and technical scheme, determine its chemical composition as following table:

[0059] Chemical composition of hypoeutectic high chromium white cast iron (Wt%)

[0060] C Si mn P S Cr V 2.36 0.8 0.65 0.026 0.02 21.6 0.25 Mo Ni RE Cu Zn Fe 1.6 0.8 0.005 0.9 0.15 margin

[0061] 2. According to the above table, and the components of steel scrap, pig iron, high-carbon ferrochrome, ferromanganese, nickel, molybdenum (selected according to the size of the casting), vanadium, rare earth, and zinc ingot, determine their proportioning relationship and provide the total weight It is the batching of 250Kg.

[0062] 3. Mix ordinary steel scrap and pig iron, heat and melt in an intermediate frequency induction furnace, and after the molten iron is melted, add high-carbon ferrochrome, ferromanganese, nickel, and molybdenum in turn, and then further melt; then, zinc with ...

Embodiment 3

[0069] 1, according to principle and technical scheme of the present invention, determine its chemical composition as shown in table five.

[0070] Chemical composition of hypoeutectic high chromium white cast iron (Wt%)

[0071] C Si mn P S Cr V 1.9 0.55 0.6 0.028 0.022 14.26 0.12 Mo Ni RE Cu Zn Fe 1.5 0.9 0.006 0.9 0.09 margin

[0072] 2. According to the above table and the composition of steel scrap, pig iron, high-carbon ferrochromium, ferromanganese, nickel, molybdenum, vanadium, rare earth and zinc ingot, determine their proportioning relationship, and provide ingredients with a total weight of 250Kg.

[0073] 3. Mix ordinary steel scrap and pig iron, heat and melt in an intermediate frequency induction furnace, and after the molten iron is melted, add high-carbon ferrochrome, ferromanganese, nickel, and molybdenum in turn, and then further melt; then, zinc with a particle size of less than 10mm Put the rare ...

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Abstract

The invention discloses a hypoeutectic high-chromium white cast iron, which comprises the following components calculated according to mass fraction: 1.9-2.4 of C, 16-22 of Cr, less than or equal to 0.8 of Si, less than or equal to 0.7 of Mn, 0.5-1.0 of Ni, 1.0-1.7 of Mo, less than 0.04 of S, less than 0.06 of P, 0.05-0.4 of RE, 0.5-1.0 of Cu, 0.05-0.15 of Zn, 0.1-0.3 of V and the balance of Fe. The preparation method comprises the following steps of: defining the mixture ratio according to the requirement of mass fraction and mixing; mixing scrap steel and pig iron in an intermediate-frequency induction furnace and heating the mixture to be melt; after molten iron is smelt, sequentially adding high carbon ferro-chrome, manganese iron, nickel and molybdenum and smelting again; feeding a zinc ingot with small granularity and rare earth or vanadium at the bottom of a casting ladle, covering a steel sheet or scrap iron and compacting; pouring the molten iron into the casting ladle and carrying out metamorphism and deslagging treatment; casting the molten iron and forming to obtain a hypoeutectic high-chromium white cast iron piece; then placing the hypoeutectic high-chromium white cast iron piece into a heat treatment furnace for thermally treating; and quenching and tempering to obtain a hypoeutectic high-chromium white cast iron material with the hardness of 60-66HRC (Hardness Rockwell) and the impact ductility of 10-14J / cm<2>. The hypoeutectic high-chromium white cast iron has the advantages of low cost, high wear resistance and reliable use safety. In addition, the preparation method of the hypoeutectic high-chromium white cast iron is simpler, and is easy in operation and strong in practicability.

Description

technical field [0001] The invention relates to high-chromium white cast iron technology, in particular to a hypoeutectic high-chromium white cast iron suitable for preparing wear-resistant parts with impact wear abrasives and a preparation method thereof. Background technique [0002] High chromium white cast iron is a kind of important wear-resistant material that is widely used. It has excellent wear resistance due to the large number of high-hardness M7C3 carbides in its structure. The toughness of cast iron has been improved. A large amount of chromium-containing hard phase M7C3 carbides in high-chromium white cast iron can effectively improve the wear resistance of the material. Therefore, it is widely used in phosphorus chemical industry, non-ferrous smelting, cement, thermal power generation, and wear-resistant parts of mines. (such as crusher blow bar, hammer head, crocodile plate, ball mill liner, etc.) [0003] In high chromium white cast irons, the increase in...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/06C22C33/08C21D5/04C21D1/18
Inventor 李家元胡绍波
Owner 云南化铸科技有限责任公司
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