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Salt bath heat treatment method for tool and mould steel

A heat treatment method and technology of tool and die steel, applied in the direction of heat treatment bath, heat treatment equipment, manufacturing tools, etc., can solve the problems of uneven annealing structure, poor processing and service performance of tool and die steel, and achieve the control of secondary carbide precipitation , Improve processing and performance, improve the effect of microstructure and grain uniformity

Inactive Publication Date: 2018-09-14
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Technical problem: The purpose of this invention is to provide a salt bath heat treatment method for tool and die steel, which can improve the structure quality and grain uniformity of tool and die steel, and solve the problem of uneven annealing structure, processing and Problems with poor performance have resulted in high uniformity tool steel salts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of salt bath heat treatment method to tool steel, comprises the steps:

[0027] (1) Put M42 tool steel in NaCl+BaCl 2 Binary molten salt (NaCl: BaCl 2 The mass ratio is 1:3) for high-temperature salt bath treatment, the salt bath temperature is 840°C, and the heating time is 2h;

[0028] (2) Quickly place the M42 tool steel after step (1) high temperature salt bath in CaCl 2 +NaCl binary molten salt (CaCl 2 :NaCl=3:1) to carry out isothermal salt bath treatment, the salt bath temperature is 780 ℃, isothermal 2h;

[0029] (3) The M42 tool steel after the isothermal salt bath in step (2) is taken out from the salt bath, and air-cooled to room temperature to obtain the M42 tool steel with high structure and uniformity.

Embodiment 2

[0031] A kind of salt bath heat treatment method to tool steel, comprises the steps:

[0032] (1) Put M42 tool steel in NaCl+KCl+BaCl 2 Ternary molten salt (NaCl:KCl:BaCl 2 The mass ratio is 2:3:5) for high-temperature salt bath treatment, the salt bath temperature is 860°C, and the heating time is 2h;

[0033] (2) Quickly place the M42 tool steel after step (1) high temperature salt bath in BaCl 2 +NaCl+KCl ternary molten salt (BaCl 2 :NaCl:KCl mass ratio is 2:2:4) for isothermal salt bath treatment, the salt bath temperature is 775 ° C, isothermal 2.5h;

[0034] (3) The M42 tool steel after the isothermal salt bath in step (2) is taken out from the salt bath, and air-cooled to room temperature to obtain the M42 tool steel with high structure and uniformity.

Embodiment 3

[0036] A kind of salt bath heat treatment method to tool steel, comprises the steps:

[0037] (1) Put M42 tool steel in BaCl 2 +NaCl binary molten salt (BaCl 2 :NaCl mass ratio is 3:1) carry out high-temperature salt bath treatment, salt bath temperature 840 ℃, heating time 3h;

[0038] (2) Quickly place the M42 tool steel after step (1) high temperature salt bath in CaCl 2 +NaCl binary molten salt (NaCl:CaCl 2 The mass ratio is 1:3) for isothermal salt bath treatment, the salt bath temperature is 770 ° C, isothermal 3h;

[0039] (3) The M42 tool steel after the isothermal salt bath in step (2) is taken out from the salt bath, and air-cooled to room temperature to obtain the M42 tool steel with high structure and uniformity.

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Abstract

The invention relates to a salt bath heat treatment method for tool and mould steel, in particular to a salt bath annealing method for the tool and mould steel. The method has the advantages that thequality and the performance of the annealed structure of materials can be improved. The method comprises the following steps that 1) high-temperature salt bath treatment is carried out, specifically,the tool and mould steel is put in a salt bath with the temperature of 840-920 DEG C for heat preservation so as to enable the temperature of the tool and mould steel to be uniform; 2) isothermal saltbath treatment is carried out, specifically, the tool and mould steel subjected to high-temperature salt bath treatment in the step 1) in put in a salt bath with the temperature of 710-780 DEG C forisothermal treatment; and 3) air cooling is carried out, specifically, air cooling is carried out on the tool and mould steel subjected to isothermal salt bath treatment in the step 2) to reach the room temperature so as to obtain the tool and mould steel with the uniform structure. The tool and mould steel prepared through the method has the advantages of being uniform in structure, uniform in grain size and good in machining performance and using performance.

Description

technical field [0001] The invention relates to a salt bath heat treatment method for tool and die steel, belonging to the field of salt bath annealing methods for tool and die steel. Background technique [0002] Tool and die steel (high-speed steel and die steel) are mainly used to manufacture complex cutting tools such as milling cutters, planer cutters, turning tools, twist drills, etc., as well as cold work molds, hot work molds, etc. Precision forming molds such as molds and plastic molds are important basic materials for high-end equipment manufacturing. [0003] With the increase in size and precision of tools and molds, the quality of tool and mold materials has become increasingly stringent. During the preparation process of tool and die steel, problems such as slow cooling rate and large difference in cooling rate between different parts are easy to exist, which lead to coarse and uneven structure of tool and die material, and uneven grain size. This problem is v...

Claims

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Application Information

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IPC IPC(8): C21D1/46C21D1/26
CPCC21D1/26C21D1/46
Inventor 周雪峰郑志霞方峰蒋建清朱小坤
Owner SOUTHEAST UNIV
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