Medium chromium alloy wear-resisting steel ball and preparation method thereof

A wear-resistant steel and chromium alloy technology, applied in the field of wear-resistant materials, can solve problems such as poor impact toughness, affecting product quality, poor wear resistance, etc., to improve tempering stability, eliminate internal stress, improve The effect of brittleness and wear resistance

Inactive Publication Date: 2018-02-27
TONGLING MINGCHENG FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cast steel balls in the prior art are mainly chromium-based alloys and manganese-based alloys, and chromium alloy cast balls are divided into low-chromium alloy cast balls, multi-element alloy cast balls, medium-chromium alloy cast balls and high-chromium alloy cast balls due to the difference in chromium content. Balls, in the process of use, have the defects of not very good impact toughness and poor wear resistance, and the medium chromium alloy cast balls are easy to crack and produce fine lines during the quenching process, which affects product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The medium chromium alloy wear-resistant steel ball proposed by the present invention has a chemical composition in weight percentage including: C1.5%, Si1.2%, Mn 0.7%, Cr 7.0%, Mo 0.5%, Ti 0.20%, Cu 0.1 %, Nb 0.05%, Al 0.06%, Hf 0.05%, B 0.05%, P 0.05%, S 0.04%, and the rest are Fe and unavoidable impurities.

[0016] The present invention also provides a method for preparing the aforementioned medium-chromium alloy wear-resistant steel ball, which includes the following steps:

[0017] S1. Casting: Put ferrochrome, scrap steel, pig iron into a vacuum induction furnace, and after the molten steel is melted, add ferromolybdenum, ferro-titanium, copper plates, aluminum ingots, ferroniobium, hafnium, ferroboron, ferrosilicon, and ferromanganese. Melting, quenching and tempering, slagging, obtaining molten steel, pouring and forming, cleaning, and obtaining castings;

[0018] S2. Put the casting into an electric furnace, heat it up to 930℃, keep it for 2h, then quickly quench it...

Embodiment 2

[0020] The medium chromium alloy wear-resistant steel ball proposed by the present invention has a chemical composition in weight percentage including: C1.7%, Si1.2%, Mn 0.8%, Cr 6.5%, Mo 0.4%, Ti 0.18%, Cu 0.12 %, Nb 0.04%, Al 0.07%, Hf 0.05%, B 0.07%, P 0.03%, S 0.02%, the rest is Fe and inevitable impurities.

[0021] The present invention also provides a method for preparing the aforementioned medium-chromium alloy wear-resistant steel ball, which includes the following steps:

[0022] S1. Casting: Put ferrochrome, scrap steel, pig iron into a vacuum induction furnace, and after the molten steel is melted, add ferromolybdenum, ferro-titanium, copper plates, aluminum ingots, ferroniobium, hafnium, ferroboron, ferrosilicon, and ferromanganese. Melting, quenching and tempering, slagging, obtaining molten steel, pouring and forming, cleaning, and obtaining castings;

[0023] S2. Put the casting into an electric furnace, heat it up to 935℃, keep it for 3h, then quickly quench it into...

Embodiment 3

[0025] The medium chromium alloy wear-resistant steel ball proposed by the present invention has a chemical composition in weight percentage including: C 1.78%, Si 1.15%, Mn 0.86%, Cr 6.3%, Mo 0.42%, Ti 0.14%, Cu 0.15%, Nb 0.035%, Al 0.07%, Hf 0.045%, B 0.08%, P 0.01%, S 0.01%, and the rest are Fe and unavoidable impurities.

[0026] The present invention also provides a method for preparing the aforementioned medium-chromium alloy wear-resistant steel ball, which includes the following steps:

[0027] S1. Casting: Put ferrochrome, scrap steel, and pig iron into a vacuum induction furnace. After the molten steel is melted, add ferromolybdenum, ferro-titanium, copper plates, aluminum ingots, ferro-niobium, hafnium, ferrosilicon, ferrosilicon, and ferromanganese. Melting, quenching and tempering, slagging, obtaining molten steel, pouring and forming, cleaning, and obtaining castings;

[0028] S2. Put the casting into an electric furnace, heat up to 940℃, keep for 2.5h, then quickly qu...

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PUM

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Abstract

The invention discloses a medium chromium alloy wear-resisting steel ball and a preparation method thereof and relates to the technical field of wear-resisting materials. The chemical components of the medium chromium alloy wear-resisting steel ball comprise, by weight, 1.5-1.9% of C, 0.9-1.2% of Si, 0.7-1.0% of Mn, 5.5-7.0% of Cr, 0.3-0.5% of Mo, 0.08-0.20% of Ti, 0.1-0.2% of Cu, 0.02-0.05% of Nb, 0.06-0.08% of Al, 0.02-0.05% of Hf, 0.05-0.1% of B, 0-0.05% of P, 0-0.04% of S, and the balance Fe and inevitable impurities. The chemical components and contents thereof of the medium chromium alloy wear-resisting steel ball are reasonably optimized, the synergy is enhanced, the strength, hardness and toughness of the medium chromium alloy are improved remarkably, the prepared wear-resisting steel ball is excellent in comprehensive mechanical performance, the good impact energy is achieved while the effect that the high hardness HRC is greater than or equal to 61 is ensured, and wear resistance and corrosion resistance are good.

Description

Technical field [0001] The invention relates to the technical field of wear-resistant materials, in particular to a medium-chromium alloy wear-resistant steel ball and a preparation method thereof. Background technique [0002] The wear-resistant steel ball is a kind of pulverizing medium used in the ball mill, and used to pulverize the material in the mill. It is a consumable. At present, wear-resistant steel balls are widely used in industrial production such as metallurgy, mineral processing, building materials, chemical industry, and electric power. The world's annual steel ball consumption is 30-50 million tons, of which China's steel ball consumption is 3-5 million tons, which is a large steel ball consumer. The service life of wear-resistant steel balls directly affects labor productivity. Therefore, the requirements for wear-resistant steel balls are not only to have sufficient strength and hardness, but also to have good impact toughness. In the prior art, cast steel b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/36C22C38/22C22C38/28C22C38/20C22C38/26C22C38/06C22C38/32C21D9/36C21D1/18
CPCC22C38/02C21D1/18C21D9/36C22C38/002C22C38/04C22C38/06C22C38/20C22C38/22C22C38/26C22C38/28C22C38/32C22C38/36
Inventor 张蔓青肖颖
Owner TONGLING MINGCHENG FOUNDRY
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