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Heat treatment process of hot work die steel

A technology of hot working die steel and process, which is applied in the field of heat treatment of die steel, and can solve the problems of crack hardenability and insufficient impact toughness of die steel

Active Publication Date: 2021-03-16
昆山博登泰金属制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art, aiming at the problems that traditional die steels are prone to cracks and have insufficient hardenability and impact toughness in the state of rapid cooling and rapid heating, and propose a heat treatment process for hot work die steels

Method used

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  • Heat treatment process of hot work die steel
  • Heat treatment process of hot work die steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to the weight percentage of chemical composition, hot work die steel is:

[0038] C: 0.4%, Cr: 2.7%, Mo: 4.2%, W: 5.3%, V: 0.85%, Mn: 0.31%, Ni: 0.75%, Cs: 0.52%, and the balance is Fe and unavoidable impurities.

[0039] The heat treatment process includes the following steps:

[0040] In the first-stage heating and returning step, the temperature is raised to 650°C at a first-stage heating rate of 10°C, and the temperature is lowered to 410°C with the furnace;

[0041] In the second-stage temperature rise and return step, the temperature is raised to 1050°C at the second-stage temperature rise rate of 8°C, and the temperature is lowered to 823°C with the furnace;

[0042] In the third-stage heating and holding step, the temperature is raised to 1142°C at a third-stage heating rate of 6°C and held for 60 minutes;

[0043] Cooling step, maintain the pressure in the furnace at 6bar and cool down to 417°C for 10 minutes, release the pressure and cool to room t...

Embodiment 2

[0050] According to the weight percentage of chemical composition, hot work die steel is:

[0051] C: 0.85%, Cr: 2.6%, Mo: 4.1%, W: 5.2%, V: 0.65%, Mn: 0.35%, Ni: 0.88%, Cs: 0.46%, S: 0.01%, and the balance is Fe and Unavoidable impurities.

[0052] The heat treatment process includes the following steps:

[0053] In the first-stage heating and returning step, the temperature is raised to 660°C at a first-stage heating rate of 12°C, and the temperature is lowered to 415°C with the furnace;

[0054] In the second-stage temperature rise and return step, the temperature is raised to 1060°C at the second-stage temperature rise rate of 7°C, and the temperature is lowered to 823±2°C with the furnace;

[0055] In the third-stage heating and holding step, the temperature is raised to 1143°C at a third-stage heating rate of 5°C and kept for 65 minutes;

[0056] Cooling step, maintain the pressure in the furnace at 6bar and cool down to 417°C for 10 minutes, release the pressure and ...

Embodiment 3

[0061] According to the weight percentage of chemical composition, hot work die steel is:

[0062] C: 0.65%, Cr: 3.3%, Mo: 4.1%, W: 5.5%, V: 0.95%, Mn: 0.33%, Ni: 1.3%, Cs: 0.36%, P: 0.005%, and the balance is Fe and Unavoidable impurities.

[0063] The heat treatment process includes the following steps:

[0064] In the first-stage heating and returning step, the temperature is raised to 650°C at a first-stage heating rate of 10-12°C, and the temperature is lowered to 410°C with the furnace;

[0065] In the second-stage temperature rise and return step, the temperature is raised to 1050°C at a second-stage temperature increase rate of 7-8°C, and the temperature is lowered to 823°C with the furnace;

[0066] In the third-stage heating and holding step, the temperature is raised to 1142°C at a third-stage heating rate of 6°C and held for 60 minutes;

[0067] Cooling step, maintain the pressure in the furnace at 6bar and cool down to 417°C for 10 minutes, release the pressure a...

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Abstract

The invention discloses a heat treatment process of hot work die steel. The hot work die steel comprises the following chemical components including, by weight, 0.4%-0.85% of C, 2.6%-3.3% of Cr, 4.1%-4.2% of Mo, 5.2%-5.5% of W, 0.65%-0.95% of V, 0.3%-0.35% of Mn, 0.7%-1.3% of Ni, 0.36%-0.52% of Cs, smaller than or equal to 0.01% of S, smaller than or equal to 0.005% of P and the balance Fe and inevitable impurities. The heat treatment process comprises a first-order temperature rising and returning step, a second-order temperature rising and returning step, a third-order temperature rising andheat preservation step, a cooling step, a copious cooling step and a tempering step. According to the heat treatment process, the hot work die steel with the optimized components is adopted for multi-stage temperature rising and returning treatment, the effect of uniform thermal stress diffusion is achieved, pressure maintaining cooling, copious cooling and tempering are combined, the impact toughness and the high-temperature stability can be considered while the high-hardness requirement of the die steel is met, and the comprehensive mechanical property is greatly improved.

Description

technical field [0001] The invention relates to a heat treatment process for hot work die steel, and belongs to the technical field of die steel heat treatment process. Background technique [0002] Die steel is mainly used in the production of forging dies and hammer forging dies. Large-scale forging dies need to withstand a cyclic impact force of hundreds of MN, and the temperature of the forging die can reach above 500°C. Therefore, in addition to high hardenability, high temperature strength, impact toughness and tempering stability, the die steel also needs It has good fatigue resistance and thermal conductivity, ensuring that the die steel will not produce thermal cracks under rapid cooling and rapid heating. Contents of the invention [0003] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art, aiming at the problems that traditional die steels are prone to cracks and have insufficient hardenability and impact toughnes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D6/04C22C38/00C22C38/04C22C38/44C22C38/46
CPCC21D6/004C21D6/005C21D6/04C22C38/44C22C38/46C22C38/04C22C38/002Y02P10/20
Inventor 张华陈敏哈
Owner 昆山博登泰金属制品有限公司
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