High-strength cast steel for coal cutter rocking arm and heat treatment process thereof

A shearer and high-strength technology, which is applied in the field of high-strength cast steel, can solve the problems of low tensile strength in mechanical properties, affecting the normal operation of the shearer, and affecting internal transmission, etc., to achieve low cost, reduce deformation, and improve The effect of mechanical properties

Inactive Publication Date: 2012-02-08
HUZHOU ZHONGLIAN MACHINERY EQUIP
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the rocker arm of the shearer is mostly made of ZG270-500, ZG30Mn2 and ZG25MnNi cast steel. The mechanical properties and tensile strength are not high, generally 550MPa. It is easy to deform during use, which will affect the internal transmission and affect the normal operation of the shearer; and its Insufficient wear resistance, surface hardness HB ~ 170, easy to cause wear and affect normal work

Method used

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Embodiment Construction

[0016] The invention discloses a high-strength cast steel for the rocker arm of a coal shearer, which comprises the following chemical components in parts by mass: C: 0.30-0.37; Si: 0.45-0.60; Mn: 0.90-1.10; Cr: 1.40-1.60; Ni: 1.40 ~1.60; Mo: 0.20~0.30; P≤0.020; S≤0.020.

[0017] For the heat treatment process of high-strength cast steel for the rocker arm of the above-mentioned coal shearer, "diffusion annealing" at 1040-1060°C is carried out first, and then "normalizing" at 890-910°C and "tempering" at 590-610°C are carried out in sequence. ".

[0018] The "diffusion annealing" process is to heat up at a rate of 110-130°C per hour, and heat up to 1040-1060°C. According to the wall thickness of the casting, keep warm for 2.5-3.5 hours every 20-30mm. After the heat preservation is completed, stop heating , the casting is cooled in a heat treatment furnace. The "normalizing and tempering" process is to heat up at a rate of 110-130°C per hour, and heat up to 890-910°C. Accordi...

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Abstract

The invention discloses a high-strength cast steel for a coal cutter rocking arm and a heat treatment process thereof. The high-strength cast steel comprises the following chemical components in part by weight: 0.30-0.37 part of C, 0.45-0.60 part of Si, 0.90-1.10 part of Mn, 1.40-1.60 part of Cr, 1.40-1.60 parts of Ni, 0.20-0.30 part of Mo, not more than 0.020 part of P and not more than 0.020 part of S. The heat treatment process of the high-strength cast steel for the coal cutter rocking arm comprises the steps of: carrying out diffusion annealing at 1,040-1,060 DEG C; and then sequentially carrying out normalizing at 890-910 DEG C and tempering at 590-610 DEG C. In the invention, because the technical scheme is adopted, the mechanical property of the product is improved, meanwhile the wearing resistance is favorable, the surface rigidity reaches HB260-285, the surface wearing capability is improved, the service life of the product is prolonged, the deformation in the use process is reduced, and the operation reliability of a device is enhanced.

Description

technical field [0001] The invention relates to a high-strength cast steel for a rocker arm of a coal mining machine and a heat treatment process thereof. Background technique [0002] At present, the rocker arm of the shearer is mostly made of ZG270-500, ZG30Mn2 and ZG25MnNi cast steel. The mechanical properties and tensile strength are not high, generally 550MPa. It is easy to deform during use, which will affect the internal transmission and affect the normal operation of the shearer; and its The wear resistance is not enough, and the surface hardness is HB~170, which is easy to cause wear and affect normal work. Contents of the invention [0003] The object of the present invention is to provide high-strength cast steel for the rocker arm of a coal mining machine, which is characterized in that: it includes the following chemical components in parts by mass: [0004] C: 0.30~0.37; [0005] Si: 0.45~0.60; [0006] Mn: 0.90~1.10; [0007] Cr: 1.40~1.60; [0008] Ni:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C21D6/00C21D1/26C21D1/28
Inventor 吴雄飞许建栋
Owner HUZHOU ZHONGLIAN MACHINERY EQUIP
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