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Preparation method of wear-resistant high-chromium cast iron

A technology of high chromium cast iron and ferrochrome, which is applied in the preparation of high chromium cast iron, adopts suspension casting and flow inoculation to treat wear-resistant cast high chromium cast iron, and can solve the problems of high brittleness, high production cost, and high addition of precious alloy elements. problem, to achieve the effect of promoting toughness, low production cost, and fine solidified structure

Inactive Publication Date: 2015-06-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the various high-chromium wear-resistant cast irons that have been successfully developed at present generally have the disadvantages of high brittleness, high addition of precious alloy elements, and high production costs.

Method used

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  • Preparation method of wear-resistant high-chromium cast iron

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The wear-resisting casting high chromium cast iron of the present invention is smelted with 250 kilograms of medium-frequency induction furnaces, and its manufacturing process steps are:

[0020] (1) Crushing ferroalloys with mass fractions of 2.53%C, 0.48%Bi, 0.81%B, 0.65%Mn, 1.51%Si, 0.039%P, 0.033%S, and the balance of Fe into ferroalloys with a particle size of 0.5-1.0mm Pills, the mass fraction is 2.01%C, 3.12%Ca, 4.85%Ba, 2.62%Ti, 12.07%Si, 0.51%Mn, 0.036%P, 0.021%S, and the intermediate iron alloy with Fe balance is crushed to a particle size of 2~ Small pieces of 5 mm, ferroalloy shot and intermediate ferroalloy were dried at 200°C for 4 hours, and then used for suspension casting and inoculation treatment respectively.

[0021] (2) Use ordinary steel scrap, recarburizer, ferrochrome, ferromolybdenum, copper plate, ferrochromium nitride, ferrosilicon, ferromanganese, ferroboron and aluminum to melt wear-resistant high-chromium cast iron in an electric furnace, a...

Embodiment 2

[0026] The wear-resisting casting high chromium cast iron of the present invention is smelted with 250 kilograms of medium-frequency induction furnaces, and its manufacturing process steps are:

[0027] (1) Crush ferroalloys with mass fractions of 2.99%C, 0.33%Bi, 0.98%B, 0.97%Mn, 2.90%Si, 0.036%P, 0.038%S, and the balance of Fe to ferroalloys with a particle size of 0.5-1.0mm Pills, the mass fraction is 2.48%C, 4.92%Ca, 3.01%Ba, 4.80%Ti, 14.99%Si, 0.98%Mn, 0.033%P, 0.017%S, and the intermediate iron alloy with Fe balance is crushed to a particle size of 2~ Small pieces of 5 mm, ferroalloy shot and intermediate ferroalloy were dried at 250°C for 3 hours, and then used for suspension casting and inoculation treatment respectively.

[0028] (2) Use ordinary steel scrap, recarburizer, ferrochrome, ferromolybdenum, copper plate, ferrochromium nitride, ferrosilicon, ferromanganese, ferroboron and aluminum to melt wear-resistant high-chromium cast iron in an electric furnace, and we...

Embodiment 3

[0032] The wear-resisting casting high chromium cast iron of the present invention is smelted with 250 kilograms of medium-frequency induction furnaces, and its manufacturing process steps are:

[0033] (1) Broken ferroalloys with mass fractions of 2.82%C, 0.43%Bi, 0.91%B, 0.73%Mn, 2.36%Si, 0.041%P, 0.035%S, and the balance of Fe to ferroalloys with a particle size of 0.5-1.0mm Pills, the mass fraction is 2.33%C, 4.14%Ca, 3.78%Ba, 3.95%Ti, 14.02%Si, 0.83%Mn, 0.038%P, 0.022%S, and the intermediate iron alloy with Fe balance is crushed to a particle size of 2~ Small pieces of 5 mm, ferroalloy pellets and intermediate ferroalloy were dried at 230°C for 4 hours, and then used for suspension casting and inoculation treatment, respectively.

[0034] (2) Use ordinary steel scrap, recarburizer, ferrochrome, ferromolybdenum, copper plate, ferrochromium nitride, ferrosilicon, ferromanganese, ferroboron and aluminum to melt wear-resistant high-chromium cast iron in an electric furnace, a...

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Abstract

The invention discloses a preparation method of wear-resistant high-chromium cast iron and belongs to the technical field of metal materials. According to the preparation method, common scrap steel, carburant, ferrochromium, ferromolybdenum, copper plates, ferrochromium nitride, ferrosilicon, ferromanganese, ferroboron and aluminum are smelted in an electric furnace so as to form the wear-resistant high-chromium cast iron. The molten wear-resistant high-chromium cast iron comprises the following chemical components in percentage by mass: 3.0-3.5% of C, 18-25% of Cr, 0.3-0.5% of Mn, 0.3-0.5% of Si, 0.18-0.25% of N, 0.5-0.8% of Mo, 0.2-0.4% of B, 0.08-0.12% of Al, 0.5-1.0% of Cu, less than 0.05% of S, less than 0.05% P and the balance of Fe. Molten iron is treated with an inoculator when taken out from the electric furnace, and is treated with a suspending agent when poured, so as to obtain fine solidification structures. Therefore, the wear-resistant high-chromium cast iron has excellent properties.

Description

technical field [0001] The invention relates to a method for preparing high-chromium cast iron, in particular to a method for wear-resistant casting high-chromium cast iron by adopting suspension casting and inoculation with flow, and belongs to the technical field of metal materials. Background technique [0002] High chromium white cast iron is known as the most excellent anti-abrasive wear material in contemporary times. With the development of production, according to the control range of chromium content, three series of Cr15, Cr20 and Cr25 are usually used. In order to meet the requirements of different working conditions, in addition to adjusting the carbon content, other alloying elements, such as nickel, tungsten, molybdenum, etc., are added to form a multi-alloy high-chromium cast iron. In order to improve the performance of high-chromium cast iron, Chinese invention patent CN102220541A discloses a high-chromium cast iron containing SiC powder, a preparation method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/06C22C33/08
Inventor 符寒光智小慧雷永平林健吴中伟
Owner BEIJING UNIV OF TECH