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Novel low alloy wear-resisting steel for wear-resisting toothed plate and heat treatment method of novel low alloy wear-resisting steel

A low-alloy, wear-resistant steel technology, applied in the field of metal materials, can solve problems such as tooth plate wear, and achieve the effects of high wear resistance, high hardness, and good comprehensive mechanical properties

Inactive Publication Date: 2018-06-05
INNER MONGOLIA METAL MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new type of low-alloy wear-resistant steel for wear-resistant tooth plates and its heat treatment method, which can solve the problems of serious wear of tooth plates of roller crushers.

Method used

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  • Novel low alloy wear-resisting steel for wear-resisting toothed plate and heat treatment method of novel low alloy wear-resisting steel
  • Novel low alloy wear-resisting steel for wear-resisting toothed plate and heat treatment method of novel low alloy wear-resisting steel
  • Novel low alloy wear-resisting steel for wear-resisting toothed plate and heat treatment method of novel low alloy wear-resisting steel

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Experimental program
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Effect test

Embodiment 1

[0030] 1) The low-alloy wear-resistant steel for tooth plates in this embodiment adopts the following design:

[0031] The chemical composition and mass percentage of steel are: C: 0.5%, Si: 0.184%, Mn: 0.88%, Cr: 2.07%, Mo: 0.152%, Ni: 0.709%, P: 0.02%, S: 0.012% , Re: 0.052%, the balance is Fe and unavoidable impurity elements.

[0032]2) A 1t acidic intermediate frequency induction furnace is used for melting. The furnace materials mainly include steel scrap, ferrosilicon (FeSi75), ferrochrome (FeCr55C25), ferromolybdenum (FeMo60), electrolytic nickel, and ferromanganese. Materials such as furnace charges added in the smelting process must be dry, and scrap steel, ferrochromium, ferromolybdenum, and metallic nickel are loaded with the furnace. Melt with 40-60% power in the first 10 minutes. After the current fluctuation tends to be stable, melt with high power. After melting, add 1.5% slagging agent (65% new sand + crushed lime 15% + fluorspar powder 20% slagging agent). ...

Embodiment 2

[0038] 1) The low-alloy wear-resistant steel for tooth plates in this embodiment adopts the following design:

[0039] Each chemical composition and mass percentage content of the steel are the same as in Example 1.

[0040] 2) The preparation method of the casting is the same as in Example 1.

[0041] Gained casting is carried out heat treatment, comprises the steps:

[0042] 1) Quenching, install the furnace below 100°C, raise the temperature to 860°C at a rate of 80°C / h for 2 hours, and oil quench;

[0043] 2) Tempering, put the oil-quenched alloy steel tooth plate in the furnace at room temperature, raise the temperature to 230°C at a rate of 80°C / h and keep it for 3h, and then air cool it out of the furnace.

[0044] 3) The casting samples after heat treatment in this embodiment were tested for mechanical properties, and the average hardness was 51HRC; impact samples were prepared for impact toughness testing at room temperature, and the impact energy with a V-shaped no...

Embodiment 3

[0046] 1) The low-alloy wear-resistant steel for tooth plates in this embodiment adopts the following design:

[0047] The chemical composition and mass percentage content of steel are: C: 0.45%, Si: 0.15%, Mn: 0.85%, Cr: 1.9%, Mo: 0.17%, Ni: 0.75%, P: 0.02%, S: 0.015% , Re: 0.06%, the balance is Fe and unavoidable impurity elements.

[0048] 2) The preparation method of the casting is the same as in Example 1.

[0049] Gained casting is carried out heat treatment, comprises the steps:

[0050] 1) Quenching, install the furnace below 100°C, raise the temperature to 900°C at a rate of 80°C / h and keep it for 2 hours, oil quenching;

[0051] 2) Tempering, put the oil-quenched alloy steel tooth plate into the furnace at room temperature, raise the temperature to 240°C at a rate of 80°C / h and keep it for 3 hours, and then take it out of the furnace and air cool.

[0052] 3) The mechanical performance test and microstructure observation were carried out on the casting samples aft...

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Abstract

The invention provides a novel low alloy wear-resisting steel for a wear-resisting toothed plate and a heat treatment method of the novel low alloy wear-resisting steel. The low alloy wear-resisting steel is prepared from the following components in percentage by mass: 0.4 to 0.5 percent of C, 0.10 to 0.20 percent of Si, 0.8 to 0.9 percent of Mn, 1.7 to 2.0 percent of Cr, 0.15 to 0.20 percent of Mo, 0.7 to 0.8 percent of Ni, smaller than or equal to 0.04 percent of P, smaller than or equal to 0.04 percent of S, 0.05 to 0.07 percent of Re and the balance of Fe and inevitable impurities. The heat treatment method comprises the following steps: firstly, quenching: charging the wear-resisting steel for the toothed plate into a furnace at the temperature below 100 DEG C, raising the temperatureto 860 to 920 DEG C at a heating speed of not greater than 100 DEG C / h, carrying out thermal insulation for 2 hours and then carrying out oil quenching after thermal insulation is ended; secondly, tempering: charging the quenched wear-resisting steel for the toothed plate into the furnace, raising the temperature to 200 to 250 DEG C at a heating speed of not greater than 100 DEG C / h, carrying outthermal insulation for 3 hours; after thermal insulation is ended, discharging from the furnace and carrying out air cooling. The low alloy wear-resisting steel disclosed by the invention has the advantages of high hardness, good toughness and excellent wear resistance; the low alloy wear-resisting steel can be widely used in mechanical products for engineering, mining, coal chemical industries and the like which require high strength and high wear resistance.

Description

technical field [0001] The invention relates to a low-alloy wear-resistant steel for a wear-resistant tooth plate of a roller crusher and a heat treatment method thereof, belonging to the field of metal materials. Background technique [0002] The double-toothed roller crusher is a kind of crushing machinery widely used in coal chemical plants in my country. The crushing principle of this crusher is mainly to crush the material through the shearing and extrusion of the crushing teeth through two rollers. Its advantages are simple structure, low power consumption, and reliable operation; the roller surface of the double-roll crusher has high wear resistance and repairability, which can ensure the stability of the gap between the rollers during work. Because the material is crushed by two rollers extrusion and shearing, it has a wide range of application to the moisture content of the material. Its characteristics are that the crushing ratio is not large, there is vibration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C33/06C21D1/18
CPCC22C38/02C21D1/18C22C33/06C22C38/005C22C38/04C22C38/44
Inventor 吕建军徐东高平王力杰侯永亮张鸣一田迎春张志伟兰兰闫志飞邸建辉杨春霞
Owner INNER MONGOLIA METAL MATERIAL RES INST