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Steel heat treatment method, steel, creeper tread and excavator

A heat treatment method and steel technology, applied in the fields of steel heat treatment, steel, crawler shoes and excavators, can solve the problems of high cost, reduced impact toughness, easy fracture, etc., and achieve long service life, excellent impact toughness, and extended service life. Effect

Inactive Publication Date: 2020-06-05
SANY HEAVY MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, the wear resistance of steel can be improved by adjusting the content of alloying elements, such as increasing the C content, adding elements such as Mn and Cr, which can increase the hardness of the track shoe; but its impact toughness will decrease and it is prone to fracture
Increasing Ni can ensure hardness, wear resistance and impact toughness at the same time, but its cost is higher

Method used

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  • Steel heat treatment method, steel, creeper tread and excavator
  • Steel heat treatment method, steel, creeper tread and excavator
  • Steel heat treatment method, steel, creeper tread and excavator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Heat treatment according to the following process steps:

[0059] (1) Austenitization: heat the casted track shoe to 870°C and keep it warm for 50 minutes;

[0060] (2) The first step isothermal quenching: Quench the austenitized track shoe to a salt bath (the mass ratio of potassium nitrate and sodium nitrate is 1:1), the temperature of the salt bath is 280°C, and keep it warm for 20 minutes;

[0061] (3) The second step of isothermal quenching: move the track shoes after the first step of isothermal quenching into a salt bath with a higher temperature (the mass ratio of potassium nitrate and sodium nitrate is 1:1), the temperature of the salt bath is 350 ° C, keep warm 40min;

[0062] (4) Air-cool the track shoes to room temperature.

[0063] It should be noted that due to the influence of the size of the experimental material, this application does not make additional requirements on the rate of heating or cooling of the material, and the conventional rate of heati...

Embodiment 2

[0069] Heat treatment according to the following process steps:

[0070] (1) Austenitization: heat the casted track shoe to 850°C and keep it warm for 60 minutes;

[0071] (2) The first step isothermal quenching: quench the austenitized track shoe to a salt bath (the mass ratio of potassium nitrate and sodium nitrate is 1:0.8), the temperature of the salt bath is 275°C, and keep it warm for 30 minutes;

[0072] (3) The second step of isothermal quenching: move the track shoes after the first step of isothermal quenching into a salt bath with a higher temperature (the mass ratio of potassium nitrate and sodium nitrate is 1:0.8), the temperature of the salt bath is 345 ° C, and keep warm 50min;

[0073] (4) Air-cool the track shoes to room temperature.

[0074] After testing, the average performance data of the crawler shoes obtained in Example 2 are: the hardness is 59HRC, and the impact toughness is 71J / cm 2 .

Embodiment 3

[0076] Heat treatment according to the following process steps:

[0077] (1) Austenitization: heat the casted track shoe to 900°C and keep it warm for 30 minutes;

[0078] (2) The first step isothermal quenching: Quench the austenitized track shoe to a salt bath (the mass ratio of potassium nitrate and sodium nitrate is 1:1.2), the temperature of the salt bath is 295°C, and keep it warm for 25 minutes;

[0079] (3) The second step of isothermal quenching: move the track shoes after the first step of isothermal quenching into a salt bath with a higher temperature (the mass ratio of potassium nitrate and sodium nitrate is 1:1.2), the temperature of the salt bath is 355 ° C, and keep warm 30min;

[0080] (4) Air-cool the track shoes to room temperature.

[0081] After testing, the average performance data of the crawler shoes obtained in Example 3 are: the hardness is 57HRC, and the impact toughness is 70J / cm 2 .

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Abstract

The invention provides a steel heat treatment method, steel, a creeper tread and an excavator. The steel heat treatment method comprises the steps that the steel is heated to be austenitized, then quenching of the first time and quenching of the second time are carried out, and cooling is carried out to reach the room temperature; and the temperature T1 of the isothermal stage of quenching of thefirst time is below the martensite phase transformation starting temperature Ms and ranges from 30 DEG C to 50 DEG C, and the temperature T2 of the isothermal stage of quenching of the second time isabove the martensite phase transformation starting temperature Ms and ranges from 20 DEG C to 30 DEG C. The steel is prepared through the steel heat treatment method. The creeper tread is prepared through the steel. The excavator comprises the creeper tread. The hardness, wear resistance and impact toughness of the steel obtained through the steel heat treatment method are obviously improved.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to a steel heat treatment method, steel, track shoes and an excavator. Background technique [0002] Steel has made an important contribution to my country's economic development and infrastructure construction. Due to the different application environments, the performance requirements for steel are also different. In addition to corrosion resistance and other requirements, the hardness, wear resistance and impact toughness of steel are also very important indicators of its performance. [0003] The current CrMo steel or high Mn steel has a tempered martensite structure after normalizing and tempering. In general, the wear resistance of steel can be improved by adjusting the content of alloying elements, such as increasing the C content, adding elements such as Mn and Cr, which can increase the hardness of the track shoe; but its impact toughness will decrease and it is prone to f...

Claims

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Application Information

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IPC IPC(8): C21D1/20C21D1/22C22C38/02C22C38/04C22C38/44E02F3/04E02F9/00
CPCC21D1/20C21D1/22C21D2211/001C21D2211/002C21D2211/008C22C38/02C22C38/04C22C38/44E02F3/04E02F9/00
Inventor 许林青周德强於为刚
Owner SANY HEAVY MACHINERY
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