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Heat treatment process of hot-work-die steel for aluminum die-casting mould

A hot work die steel and process technology, applied in the field of iron and steel metallurgy technology, can solve problems such as cracks and increased thermal stress of water-cooled holes, and achieve the effects of optimized design, guaranteed hardness, and good thermal crack resistance.

Inactive Publication Date: 2012-10-03
柳州福臻车体实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the following problems arise: the thermal stress generated on the surface of the water-cooling hole increases when the aluminum product is cast, and cracks occur from the water-cooling hole.
However, no material satisfying this property has been proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A heat treatment process for hot work die steel, the hot work die steel is composed of the following components in weight percentage: C 0.30%, Si 1.20%, Mn 1.50%, Cr 5.50%, W 1.60%, Mo 0.30%, V 1.60%, Ni 1.60%, Co 0.2%, Nb 0.7%, S≤0.005%, P≤0.03%, and the balance is Fe; the heat treatment process includes the following steps:

[0023] (1) Quenching: Heat the mold steel billet to 650°C at a heating rate of 60°C / min, and keep it for 90 minutes; then heat it to 1080°C at a heating rate of 60°C / min, hold it for 180 minutes, and cool it by oil quenching;

[0024] (2) Tempering: For the first tempering, heat up to 500°C at a heating rate of 60°C / min, then air cool to room temperature, temper for the second time, and heat to 450°C at a heating rate of 30°C / min, then Air cool to room temperature.

Embodiment 2

[0026] A heat treatment process for hot work die steel, the hot work die steel is composed of the following components in weight percentage: C 0.50%, Si 0.80%, Mn 1.70%, Cr 4.50%, W 2.00%, Mo 0.10%, V 1.80%, Ni 1.20%, Co 0.4%, Nb 0.5%, S≤0.005%, P≤0.03%, and the balance is Fe; the heat treatment process includes the following steps:

[0027] (1) Quenching: Heat the mold steel billet to 630°C at a heating rate of 90°C / min, and keep it for 120 minutes; then heat it to 1120°C at a heating rate of 30°C / min, hold it for 150 minutes, and cool it by oil quenching;

[0028] (2) Tempering: For the first tempering, heat up to 480°C at a heating rate of 90°C / min, then air cool to room temperature, temper for the second time, and heat to 430°C at a heating rate of 60°C / min, then Air cool to room temperature.

Embodiment 3

[0030] A heat treatment process for hot work die steel, the hot work die steel is composed of the following components in weight percentage: C 0.40%, Si 1.0%, Mn 1.60%, Cr 5.0%, W 1.8%, Mo 0.20%, V 1.7%, Ni 1.4%, Co 0.3%, Nb 0.6%, S≤0.005%, P≤0.03%, the rest is Fe;

[0031] Described heat treatment process comprises the following steps:

[0032] (1) Quenching: Heat the die steel billet to 640°C at a heating rate of 75°C / min, and keep it for 105 minutes; then heat it to 1100°C at a heating rate of 45°C / min, hold it for 165 minutes, and cool it by oil quenching;

[0033] (2) Tempering: For the first tempering, heat up to 490°C at a heating rate of 75°C / min, then air cool to room temperature, temper for the second time, and heat to 440°C at a heating rate of 45°C / min, then Air cool to room temperature.

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Abstract

The invention discloses a heat treatment process of hot work die steel. The hot work die steel consists of the following components in percentage by weight: 0.30 to 0.50 percent of C, 0.80 to 1.20 percent of Si, 1.50 to 1.70 percent of Mn, 4.50 to 5.50 percent of Cr, 1.60 to 2.00 percent of W, 0.10 to 0.30 percent of Mo, 1.60 to 1.80 percent of V, 1.20 to 1.60 percent of Ni, 0.2 to 0.4 percent of Co, 0.5 to 0.7 percent of Nb, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of P and the balance of Fe. The heat treatment process comprises the following steps of: (1) quenching, namely heating a die steel blank to the temperature of between 630 and 650 DEG C at a temperature rise speed of 60 to 90 DEG C per minute, and preserving the temperature for 90 to 120 minutes, and heating the die steel blank to the temperature of between 1080 and 1120 DEG C at a temperature rise speed of 30 to 60 DEG C per minute, preserving the temperature for 150 to 180 minutes, and cooling through oil quenching; and (2) tempering, namely carrying out primary tempering, heating the die steel blank to the temperature of between 480 and 500 DEG C at a temperature rise speed of 60 to 90 DEG C per minute, performing air cooling to room temperature, carrying out secondary tempering, heating the die steel blank to the temperature of between 430 and 450 DEG C at a temperature rise speed of 30 to 60 DEG C per minute, and performing air cooling to room temperature.

Description

technical field [0001] The invention relates to iron and steel metallurgy technology, in particular to a heat treatment technology for hot work die steel. Background technique [0002] As an aluminum die-casting die, there has been a problem that cracks (hot cracks) are generated on the surface of the cavity due to thermal fatigue. This thermal cracking refers to the following phenomenon: when cooling water is poured on the surface of the cavity after the mold is opened, tensile stress is generated on the surface of the cavity due to the temperature difference between the rapid cooling of the surface of the cavity and the inside of the heated state. Cracks are generated on the surface of the cavity due to thermal fatigue caused by this repeated process. For this hot tear, it is advantageous to increase the hardness of the mold. [0003] On the other hand, in recent years, there has been a demand for shortening the production cycle (higher cycle rate) of aluminum die-castin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C22C38/58C22C38/54B22D17/22
Inventor 刘仕爽
Owner 柳州福臻车体实业有限公司
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