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Dievar steel and heat treatment method thereof

A heat treatment method and heat preservation section technology, applied in the direction of improving process efficiency, etc., can solve the problems of low tempering resistance of Dievar steel, difficulty in adapting to high mechanical load conditions, and lower hardness of Dievar steel

Active Publication Date: 2022-07-08
JIANGSU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tempering resistance of the Dievar steel prepared by the above conventional process is low, and if it is tempered after quenching according to the demand, the hardness of the Dievar steel will be further reduced, which makes it difficult for the Dievar steel to adapt to the conditions of high mechanical load.

Method used

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  • Dievar steel and heat treatment method thereof
  • Dievar steel and heat treatment method thereof
  • Dievar steel and heat treatment method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The heat treatment method of Dievar provided by the present embodiment consists of the following steps:

[0055] (1) Spheroidizing annealing the Dievar steel to be treated (without heat treatment after forging); the chemical composition of the Dievar steel in terms of mass percentage is: C 0.39%, Mn 0.42%, Si 0.22%, Mo 2.37%, Cr4 .84%, P0.007%, S 0.010%, V 0.7% and the balance Fe; wherein, the spheroidizing annealing is specifically: heating the Dievar steel to be treated to 860 ° C for 2 hours, and then at 60 ° C / The rate of h was cooled to 740 °C for 4 h, so as to homogenize the carbides for subsequent heat treatment;

[0056] (2) the spheroidized Dievar steel obtained in the step (1) was first heated to 900° C. and kept for 30 minutes; then the temperature was raised to 1030° C. with a holding time of 10 minutes to obtain austenitized Dievar steel;

[0057] (3) Austenitized Dievar steel obtained in the step (2) is sequentially subjected to isothermal quenching and ...

Embodiment 2

[0059] The heat treatment method of Dievar provided by the present embodiment consists of the following steps:

[0060] (1) Spheroidizing annealing the Dievar steel to be treated (without heat treatment after forging); the chemical composition of the Dievar steel in terms of mass percentage is: C 0.39%, Mn 0.42%, Si 0.22%, Mo 2.37%, Cr 4.84%, P0.007%, S 0.010%, V 0.7% and the balance of iron; wherein, the spheroidizing annealing is specifically: heating the Dievar steel to be treated to 860 ° C, holding for 2 hours, and then at 60 ° C / h The cooling rate was lowered to 740 °C, kept for 4 h, and then cooled to 500 °C with the furnace, taken out and cooled to room temperature;

[0061] (2) the spheroidized Dievar steel obtained in the step (1) is first heated to 900° C., and kept for 30 minutes; then the temperature is raised to 1030° C., and the temperature is kept for 10 minutes to obtain austenitized Dievar steel;

[0062] (3) Austenitized Dievar steel obtained in the step (2...

Embodiment 3

[0064] The heat treatment method of Dievar provided by the present embodiment consists of the following steps:

[0065] (1) Spheroidizing annealing the Dievar steel to be treated (without heat treatment after forging); the chemical composition of the Dievar steel in terms of mass percentage is: C 0.39%, Mn 0.42%, Si 0.22%, Mo 2.37%, Cr 4.84%, P0.007%, S 0.010%, V 0.7% and the balance of iron; wherein, the spheroidizing annealing is specifically: heating the Dievar steel to be treated to 860 ° C, holding for 2 hours, and then heating at 60 ° C / The cooling rate of h was cooled to 740 °C, kept for 4 h, and then cooled to 500 °C with the furnace, taken out and cooled to room temperature;

[0066] (2) the spheroidized Dievar steel obtained in the step (1) is first heated to 900° C., and kept for 30 minutes; then the temperature is raised to 1030° C., and the temperature is kept for 10 minutes to obtain austenitized Dievar steel;

[0067] (3) Austenitized Dievar steel obtained in ...

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Abstract

The invention provides Dievar steel and a heat treatment method thereof, and belongs to the technical field of metal heat treatment. The heat treatment method of the Dievar steel, provided by the invention, comprises the following steps: sequentially carrying out spheroidizing annealing, austenitizing and isothermal quenching on the Dievar steel to be treated to obtain the Dievar steel; the isothermal temperature of isothermal quenching ranges from 300 DEG C to 400 DEG C, and the isothermal time ranges from 2 min to 8 min; the speed of cooling to the isothermal temperature is 8-20 DEG C / s. According to the heat treatment method provided by the invention, isothermal quenching is carried out under the conditions of spheroidizing annealing and sufficient austenitizing, and the technological parameters of isothermal quenching are controlled, so that the formation of lower bainite is facilitated, and the tempering resistance of the Dievar steel is improved, thereby effectively improving the hardness of the Dievar steel in the tempering process. The average hardness after isothermal quenching is higher than the hardness after oil quenching by a conventional process, and the hardness after tempering can reach the hardness level after oil quenching by the conventional process.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to a Dievar steel and a heat treatment method thereof. Background technique [0002] Hot work dies are mainly used for hot forming processes such as hot forging, die casting and extrusion of metal materials. They are subjected to severe temperature and mechanical loads. The main failure factors include: fracture caused by fatigue, dimensional errors caused by wear and generation under overload conditions. stress concentration. The types of failures applied to hot work dies can be divided into: large size cracks, corner cracks, and cracks caused by wear or erosion. Therefore, hot work die materials generally need to have high strength, hardness and thermal stability, especially high hardness, otherwise it will fail due to deformation or cracking under high mechanical load conditions. [0003] Dievar steel is a common type of hot work die steel and has a wide range of i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/30C21D1/20C21D6/00C22C38/02C22C38/04C22C38/22C22C38/24
CPCC21D1/30C21D1/20C21D6/002C21D6/005C21D6/008C22C38/02C22C38/04C22C38/22C22C38/24C21D2211/008C21D2211/002Y02P10/20
Inventor 鞠玉琳谢奕心魏琪程晓农
Owner JIANGSU UNIV