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High-hardness-toughness bainite wear-resistant cast steel as well as preparation method and application thereof

A bainite, high-hard technology, applied in the field of wear-resistant cast steel, can solve the problems of low toughness and low service life, and achieve the effects of excellent performance, easy control and reasonable composition design

Active Publication Date: 2021-04-02
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN102877008B discloses a preparation method of bainite wear-resistant cast steel. The obtained bainite wear-resistant cast steel has an HRC of 46.2 and a V-shaped notch impact absorption energy of 25.6J, which can be applied to common wear-resistant components, but the bainitic wear-resistant cast steel obtained by this method has high hardness and low toughness, and the service life is relatively low in the working environment of high impact

Method used

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  • High-hardness-toughness bainite wear-resistant cast steel as well as preparation method and application thereof
  • High-hardness-toughness bainite wear-resistant cast steel as well as preparation method and application thereof
  • High-hardness-toughness bainite wear-resistant cast steel as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, a kind of high-hardness ductile bainite wear-resistant cast steel

[0029] The chemical composition and mass content of the high-hardness ductile bainitic wear-resistant cast steel are: C: 0.25%, Si: 1.6%, Mn: 0.85%, Cr: 1.6%, Mo: 0.3%, Cu: 0.4% , RE: 0.03%, P: 0.023%, S: 0.038%, and the balance is iron and unavoidable impurities.

[0030] The preparation method of the high-hardness ductile bainitic wear-resistant cast steel comprises the following steps:

[0031] S1) Smelting: adding pig iron, scrap steel, pure iron metal and ferroalloy to an electric furnace for smelting, placing molten steel out of the furnace in a steel drum, and inoculating and modifying it with rare earth ferrosilicon alloy to obtain molten steel to be poured;

[0032] S2) casting molding: pouring the molten steel to be poured obtained in the step S1 through the gate, solidifying and cooling to obtain a casting;

[0033] S3) Normalizing: the casting obtained in step S2 is subjected...

Embodiment 2

[0036] Embodiment 2, a kind of high-hardness ductile bainite wear-resistant cast steel

[0037] The chemical composition and mass content of the high-hardness ductile bainite wear-resistant cast steel are: C: 0.30%, Si: 2.0%, Mn: 1.0%, Cr: 1.4%, Mo: 0.4%, Cu: 0.5% , RE: 0.03%, P: 0.023%, S: 0.038%, and the balance is iron and unavoidable impurities.

[0038] The preparation method of the high-hardness ductile bainitic wear-resistant cast steel comprises the following steps:

[0039] S1) Smelting: adding pig iron, scrap steel, pure iron metal and ferroalloy to an electric furnace for smelting, placing molten steel out of the furnace in a steel drum, and inoculating and modifying it with rare earth ferrosilicon alloy to obtain molten steel to be poured;

[0040] S2) casting molding: pouring the molten steel to be poured obtained in the step S1 through the gate, solidifying and cooling to obtain a casting;

[0041] S3) Normalizing: the casting obtained in step S2 is subjected t...

Embodiment 3

[0045] Embodiment 3, a kind of high-hardness ductile bainite wear-resistant cast steel

[0046]The chemical composition and mass content of the high-hardness ductile bainite wear-resistant cast steel are: C: 0.32%, Si: 2.0%, Mn: 1.2%, Cr: 1.4%, Mo: 0.4%, Cu: 0.4% , RE: 0.04%, P: 0.024%, S: 0.035%, and the balance is iron and unavoidable impurities.

[0047] The preparation method of the high-hardness ductile bainitic wear-resistant cast steel comprises the following steps:

[0048] S1) Smelting: adding pig iron, scrap steel, pure iron metal and ferroalloy to an electric furnace for smelting, placing molten steel out of the furnace in a steel drum, and inoculating and modifying it with rare earth ferrosilicon alloy to obtain molten steel to be poured;

[0049] S2) casting molding: pouring the molten steel to be poured obtained in the step S1 through the gate, solidifying and cooling to obtain a casting;

[0050] S3) Normalizing: the casting obtained in step S2 is subjected to...

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Abstract

The invention belongs to the technical field of wear-resistant cast steel, and particularly relates to high-hardness-toughness bainite wear-resistant cast steel and a preparation method and application thereof. The high-hardness-toughness bainite wear-resistant cast steel comprises the following chemical components in percentage by mass: 0.25-0.44% of C, 1.2-2.2% of Si, 0.8-1.5% of Mn, 1.0-1.9% ofCr, 0.3-0.6% of Mo, 0.3-0.6% of Cu, 0.03-0.08% of RE, less than or equal to 0.032% of P, less than or equal to 0.040% of S and the balance of Fe and inevitable impurities. The high-hardness--toughness bainite wear-resistant cast steel has high hardness and high toughness, particularly has matched hardness and toughness, has performance superior to that of in-service bainite cast steel, and is particularly suitable for manufacturing wear-resistant parts of large semi-autogenous mill lining plates and the like under the large-impact abrasive wear working condition.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant cast steel, and in particular relates to a high-hardness ductile bainite wear-resistant cast steel and a preparation method and application thereof. Background technique [0002] Semi-autogenous mills are the main crushing and grinding equipment in metallurgical mines and other fields, and play an indispensable role in the development of modern industry. The liner is a key part to ensure the normal operation of the mill. While helping to lift the grinding body and materials, it protects the cylinder from the impact and wear of the above two. However, due to the repeated impact and wear of mineral materials and grinding balls, the liner has become the most vulnerable part of the semi-autogenous mill. Its service life has also become an important factor in determining the production efficiency and energy consumption of the mill. Every year, hundreds of thousands of tons of semi-autogenous mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/20C22C38/34C22C33/06C21D1/28C21D1/20C21D1/607B02C17/22
CPCB02C17/22C21D1/20C21D1/28C21D1/607C21D2211/001C21D2211/002C22C33/06C22C38/005C22C38/02C22C38/04C22C38/20C22C38/22C22C38/34
Inventor 李卫李杰涂小慧武兆洋
Owner JINAN UNIVERSITY
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