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Heat treatment method for 5CrNiMo forging die

A heat treatment method and technology for forging dies, which are applied in the field of heat treatment of 5CrNiMo forging dies, can solve problems such as short service life of hot forging dies, and achieve the effects of prolonging service life, improving toughness and improving economic benefits.

Active Publication Date: 2014-03-05
ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1
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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 provide a heat treatment method for a 5CrNiMo forging die, which can effectively prolong the service life of the forging die in view of the short service life of the existing hot forging die

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Heat the 5CrNiMo forging die to 660°C and hold it for 5 hours, then heat it to 880°C and hold it for 3 hours; then take it out of the furnace and air-cool it to 770°C, then oil-cool it to 180°C and then air-cool it to room temperature; then, heat it to 200°C and hold it for 5 hours, then oil-cool it to room temperature.

Embodiment 2

[0016] Heat the 5CrNiMo forging die to 670°C and keep it for 4 hours, then heat it to 890°C and keep it for 2 hours; then take it out of the furnace and air-cool it to 780°C, then oil-cool it to 195°C and then air-cool it to room temperature; then, heat it to 180°C for 4 hours and then oil-cool it to room temperature.

Embodiment 3

[0018] Heat the 5CrNiMo forging die to 680°C and hold it for 3 hours, then heat it to 885°C and hold it for 2.5 hours; then take it out of the furnace and air-cool it to 790°C, then oil-cool it to 200°C and then air-cool it to room temperature; then, heat it to 190°C and hold it for 6 hours and then oil-cool it to room temperature.

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Abstract

The invention discloses a heat treatment method for a 5CrNiMo forging die. The method comprises the steps of conducting furnace heating on the 5CrNiMo forging die subjected to isothermal annealing to a temperature of 880-890 DEG C and conducting high-temperature thermal insulation at the temperature; drawing the die out of the furnace, cooling the die to a temperature of 770-790 DEG C by air, cooling the die to a temperature of 180-200 DEG C by oil, and then cooling the die to the room temperature by air; and then, heating to a temperature of 180-200 DEG C, conducting isothermal thermal insulation, and cooling the die to the room temperature by oil. According to the method, simple adjustment of a heat treatment process is conducted, the abrasive resistance of the 5CrNiMo forging die is effectively improved, and the service life of the forging die is prolonged.

Description

technical field [0001] The invention relates to a heat treatment process for a forging die, in particular to a heat treatment method for a 5CrNiMo forging die. Background technique [0002] 5CrNiMo is a hot forging die steel with a large amount of use, and a relatively mature heat treatment process has been formed in production. Since the 5CrNiMo hot forging die will bear a huge impact load in the working environment, it will cause uneven thermal stress and thermal strain during repeated heating and cooling, and at the same time bear the friction between the flowing hot metal and the surface of the cavity, so its service life Short, often produce cracking, collapse, wear, thermal fatigue and other failure phenomena. The main failure mode of the forging die is cracking and cavity wear, which is caused by the insufficient toughness of the hot forging die and the low wear resistance of the forging die cavity surface. Analysis shows that improper heat treatment is the main cau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26
Inventor 郭秋彦陈倩李莉刘强杨安志赵福全
Owner ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD