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Steel for high-toughness rotary blade, and heat treatment method thereof

A heat treatment method and the technology of the rotary tiller, which are applied in the field of metallurgy, can solve problems such as high production cost, high alloy cost, and complicated process, and achieve the effects of low production cost, improved hardenability, and improved toughness

Inactive Publication Date: 2021-02-12
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent application 201910187480X discloses a rotary tiller blade material and its preparation method. The alloy composition contains Ni, V, Nb, Cr, etc., and the cost of the alloy is relatively high, and the process is complicated and the production cost is relatively high.

Method used

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  • Steel for high-toughness rotary blade, and heat treatment method thereof
  • Steel for high-toughness rotary blade, and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] See Table 1 for the chemical composition and mass percentage of the steel for the high-toughness rotary tillage blade in this example.

[0028] The heat treatment method of the high-toughness rotary tiller steel in this embodiment includes the following steps in sequence: quenching, heat preservation, water cooling, tempering and heat preservation. Fire, keep warm for 15min.

[0029] The test results of the mechanical properties of the high-toughness rotary tiller steel in this example are: the hardness is 46HRC and the impact value is 20J.

[0030] The metallographic structure of the high-toughness rotary tiller blade steel in this embodiment is shown in figure 1 .

Embodiment 2

[0032] See Table 1 for the chemical composition and mass percentage of the steel for the high-toughness rotary tillage blade in this example.

[0033] The heat treatment method of the high-toughness rotary tiller steel in this embodiment includes the following steps in sequence: quenching, heat preservation, water cooling, tempering and heat preservation. The specific process parameters are: quenching temperature is 880°C, heat preservation for 10min, water cooling at room temperature, and tempering at 320°C , keep warm for 21 minutes.

[0034] The test results of the mechanical properties of the high-toughness rotary tiller blade steel in this example are: the hardness is 47 HRC and the impact value is 18 J.

Embodiment 3

[0036] See Table 1 for the chemical composition and mass percentage of the steel for the high-toughness rotary tillage blade in this example.

[0037] The heat treatment method of the high-toughness rotary tiller steel in this embodiment includes the following steps in sequence: quenching, heat preservation, water cooling, tempering and heat preservation. Fire, keep warm for 22min.

[0038] The test results of the mechanical properties of the high-toughness rotary tiller steel in this example are: the hardness is 45HRC and the impact value is 22J.

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Abstract

The invention discloses steel for a high-toughness rotary blade, and a heat treatment method thereof. The steel comprises the components by mass: 0.30%-0.36% of C, 0.90%-1.50% of Mn, 0.20%-0.50% of Si, 0.001%-0.006% of B, no more than 0.02% of S, no more than 0.02% of P and the balance Fe and inevitable impurities. The heat treatment method sequentially comprises the following steps of quenching,heat preservation, water cooling, tempering and heat preservation. According to the steel, through regulation of the components, the toughness and hardenability of the steel are improved, and meanwhile, the impact toughness of the rotary blade is improved to 1525J by adopting a corresponding heat treatment process. The use requirements of a high-toughness rotary blade of an agricultural implementare met, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-toughness rotary blade steel for agricultural machinery and a heat treatment method thereof. Background technique [0002] Most of the agricultural machinery is open-air operation, the working environment is poor, and the use environment is relatively harsh. The rotary tiller is a key part and wearing part of the rotary tiller. It directly plows and harrows the cultivated land through forward and rotary motions. It often comes into contact with soil, sand, crop stalks, and roots. In order to improve the tillage quality and operating efficiency of the cultivator, the rotary cultivator blade needs sufficient toughness in addition to hardness. At present, the main materials for making rotary tillers are generally 65Mn high-quality carbon structural steel and 60Si2Mn spring steel. Generally, quenching and tempering at medium temperature are adopted. Quenching t...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C21D6/00C21D1/18
CPCC21D1/18C21D6/005C21D6/008C21D2211/008C22C38/002C22C38/02C22C38/04
Inventor 郭健田东宽郝雷王显张宏乐刘杰李勃贾慧淑杨丽娜
Owner TANGSHAN IRON & STEEL GROUP
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