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H13 die steel and heat treatment technique thereof

A technology of die steel and heat treatment furnace, applied in the field of H13 die steel and its heat treatment process, can solve the problems of unstable mechanical properties of H13 die steel, and achieve the effects of improving purity and density, promoting full diffusion and reducing segregation

Active Publication Date: 2019-06-07
SHANDONG TECHGONG GEOTECHN ENG EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above prior art, the present invention provides a heat treatment process for H13 die steel to solve the technical problem of unstable mechanical properties of H13 die steel

Method used

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  • H13 die steel and heat treatment technique thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A heat treatment process for H13 die steel, comprising the following steps:

[0017] (1) Primary heat treatment: Air-cool the forged H13 billet (1120mm×690mm×170mm) to 450°C in air, then put it into a heat treatment furnace with a furnace temperature of 300°C, and increase the furnace temperature at a heating rate of 15°C / h Raise to 550°C, hold for 3 hours, then raise the furnace temperature to 850°C at a heating rate of 25°C / h, hold for 2 hours, then quickly raise the furnace temperature to 1000°C, hold for 10 hours, and then quickly cool the H13 billet The temperature drops to 350°C;

[0018] (2) Secondary heat treatment: put the H13 billet processed in step (1) into a heat treatment furnace with a furnace temperature of 300°C, raise the furnace temperature to 630°C at a heating rate of 10°C / h and keep it warm for a holding time of 100s / mm (for every 1mm increase in steel thickness, the holding time is extended by 100s); then the furnace temperature is raised to 900°...

Embodiment 2

[0022] A heat treatment process for H13 die steel, comprising the following steps:

[0023] (1) Primary heat treatment: Air-cool the forged H13 billet (1120mm×690mm×170mm) to 480°C in air, then put it into a heat treatment furnace with a furnace temperature of 280°C, and increase the furnace temperature at a heating rate of 10°C / h. Raise to 560°C, hold for 2.5 hours, then raise the furnace temperature to 870°C at a heating rate of 40°C / h, hold for 2 hours, then quickly raise the furnace temperature to 1050°C, hold for 10 hours, and then cool the H13 The temperature of the billet drops to 370°C;

[0024] (2) Secondary heat treatment: put the H13 billet processed in step (1) into a heat treatment furnace with a furnace temperature of 280°C, raise the furnace temperature to 640°C at a heating rate of 15°C / h and keep it warm for a holding time of 90s / mm; then raise the furnace temperature to 930°C at a heating rate of 15°C / h and keep it warm for 130s / mm; then raise the furnace te...

Embodiment 3

[0028] A heat treatment process for H13 die steel, comprising the following steps:

[0029] (1) Primary heat treatment: Air-cool the forged H13 billet (1120mm×690mm×170mm) to 500°C in air, then put it into a heat treatment furnace with a furnace temperature of 250°C, and increase the furnace temperature at a heating rate of 20°C / h. Raise to 570°C, hold for 2 hours, then raise the furnace temperature to 900°C at a heating rate of 50°C / h, hold for 1 hour, then quickly raise the furnace temperature to 1050°C, hold for 8 hours, and then quickly cool the H13 billet The temperature drops to 400°C;

[0030] (2) Secondary heat treatment: put the H13 billet processed in step (1) into a heat treatment furnace with a furnace temperature of 250°C, raise the furnace temperature to 650°C at a heating rate of 20°C / h and keep it warm for a holding time of 80s / mm; then raise the furnace temperature to 950°C at a heating rate of 20°C / h and keep it warm for 120s / mm; then raise the furnace tempe...

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Abstract

The invention discloses H13 die steel and a heat treatment technique thereof. The H13 die steel is obtained through twice heat treatment, quenching and tempering treatment, wherein the primary heat treatment is that a H13 blank is put into a heat treatment furnace, heated to 550-570 DEG C, 850-900 DEG C and 1000-1050 DEG C sequentially, kept at the corresponding temperature for a period of time, and then cooled quickly with strong wind; and the secondary heat treatment is that the H13 blank after the primary heat treatment is heated to 630-650 DEG C, 900-950 DEG C and 1100 DEG C sequentially,kept at the corresponding temperature for a period of time, and then put into a quenching nitrate furnace for quenching, and finally the quenched H13 blank is heated to 550-600 DEG C and then cooled to room temperature to complete the heat treatment. According to the heat treatment technique of the H13 die steel , the segregation of the H13 die steel structure can be effectively reduced, the impact toughness and the thermal fatigue resistance of the H13 die steel structure are improved, and the service life is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of die steel heat treatment, and in particular relates to an H13 die steel and a heat treatment process thereof. Background technique [0002] H13 steel is an air-cooled hardening hot work die steel with both strength and toughness. Because of its good thermal strength, red hardness, high toughness, thermal fatigue resistance and thermal corrosion resistance, it has been widely used in Hot forging dies, aluminum alloy die-casting dies and hot extrusion dies. H13 hot work die steel contains 8% alloy elements. During the solidification process, due to the separation and crystallization, there are serious dendrite segregation in the core of the ingot. At the same time, a large number of massive eutectics with high melting point are enriched between the dendrites carbide. At present, some H13 hot work die steel forgings provided in the domestic market, even after high-temperature diffusion annealing and prelim...

Claims

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Application Information

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IPC IPC(8): C21D6/00C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 栾道成陈宝书胡志华王正云陈杰廖力孙建国
Owner SHANDONG TECHGONG GEOTECHN ENG EQUIP CO LTD
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