Thermal treatment method for thick die steel

A heat treatment method and die steel technology, applied in the field of die steel, can solve the problems of affecting polishing and performance, uneven distribution of hardness, difficulty in achieving basically consistent cooling rate control, etc.

Active Publication Date: 2017-03-08
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the actual production process, for large mold steel modules with a thickness greater than 700mm, impermeability during quenching is prone to occur, resulting in the appearance of pearlite structure, which in turn leads to problems such as insufficient hardness and uneven hardness distribution after tempering, which affects polishing and polishing. Performance
[0006] The publication number is "CN105695703A", and the title of the invention is "A Die Steel Heat Treatment Process". It discloses a two-fire direct heat treatment process method of 7Cr7Mo2V2Si high-strength and toughness cold-work die steel preparatory heat treatment and quenching and tempering. From the parameters introduced Look, only the hardness and wear resistance of the mold steel have some effect, but it is difficult to achieve the same cooling rate control in the internal and external heat treatment process of the material, and it is difficult to guarantee the uniformity of structure and performance
[0007] The

Method used

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  • Thermal treatment method for thick die steel
  • Thermal treatment method for thick die steel
  • Thermal treatment method for thick die steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Take the mold steel whose material is 1.2738. The thickness of the mold steel is 810mm, the width is 1300mm, and the length is 4000mm. The ingot quenching heating temperature is 890°C, and the hoisting time is 3 minutes, during which the air is naturally cooled. After the hoisting is completed, the quenching process begins.

[0092] Table 1 Quenching Process of Thick Specification 1.2738 Die Steel

[0093] Craft pass cooling method Cooling time ( / s) 1 air cooled 310 2 spray cooling 45 3 air cooled 200 4 Fog cold 200 5 spray cooling 85 6 air cooled 420 7 spray cooling 85 8 air cooled 310 9 Fog cold 300 10 spray cooling 125 11 air cooled 610 12 Fog cold 610 13 spray cooling 155 14 air cooled 910 15 spray cooling 155 16 air cooled 910

[0094] After quenching by the above process, the cross-sectional hardness of the obtained die steel is 33.5-34...

Embodiment 2

[0096] Take the mold steel whose material is 1.2738. The thickness of the mold steel is 810mm, the width is 1300mm, and the length is 4000mm. The ingot quenching heating temperature is 850°C, and the hoisting time is 4 minutes, during which the air is naturally cooled. After the hoisting is completed, the quenching process begins.

[0097] Table 2 Quenching Process of Thick Specification 1.2738 Die Steel

[0098]

[0099]

[0100] After quenching by the above process, the obtained die steel has a cross-sectional hardness of 33-35HRC.

Embodiment 3

[0102] Take the mold steel whose material is 1.2738. The thickness of the mold steel is 810mm, the width is 1300mm, and the length is 4000mm. The ingot quenching heating temperature is 800°C, and the hoisting time is 2 minutes, during which the air is naturally cooled. After the hoisting is completed, the quenching process begins.

[0103] Table 3 Quenching process of thick specification 1.2738 die steel

[0104]

[0105]

[0106] After quenching by the above process, the obtained die steel has a cross-sectional hardness of 34-36HRC.

[0107] Embodiments 1 to 3 of the present invention quench the mold steel through a total of 16 cooling passes. The three cooling methods are carried out alternately and strictly in accordance with the cooling time, which improves the uniformity of quenching and cooling, reduces the deformation of the workpiece, and improves the The first pass rate of the product, the hardness difference of the edge and center of the section after heat tr...

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Abstract

The invention belongs to the technical field of die steel and particularly relates to a thermal treatment method for thick die steel. The thermal treatment method for thick die steel comprises the steps that steel ingots are subjected to quenching heating, the tapping temperature is 800-900 DEG C, and the hoisting time is 2-4 min; air cooling is conducted during hoisting; and the quenching process is conducted after completion of hoisting. According to the thermal treatment method for thick die steel, the problem of hardenability of die steel of 700-900 mm is mainly involved. The quenching quality is improved by making the reasonable field quenching thermal treatment process.

Description

technical field [0001] The invention belongs to the technical field of die steel, and in particular relates to a heat treatment method for thick gauge die steel. Background technique [0002] The characteristics of large forgings are: large shape and heavy weight, high quality requirements during production, only single piece and small batch production, and long production cycle and strict technical conditions. In my country's current heavy equipment manufacturing industry, there is a great demand for large-scale forgings, and the quality requirements are also high, especially all kinds of high-strength and high-precision forgings still need to be imported, which has become the development trend of my country's heavy equipment manufacturing industry. one of the bottlenecks. [0003] The production of large forgings has to go through many processes from smelting, ingot casting, forging, post-forging heat treatment to performance heat treatment, and each process affects the qu...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D6/00
CPCC21D1/18C21D6/00
Inventor 肖强罗许李俊洪刘序江
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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