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Heat treatment process of low-alloy large mold steel

A die steel and low alloy technology, applied in the field of heat treatment, can solve the problems of reducing the qualified rate of finished products, easy to produce quenching cracks, large size, etc., and achieve the effect of improving the qualified rate of finished products and avoiding quenching cracks

Inactive Publication Date: 2016-08-03
TAICANG HUTAI HOT PROCESSING PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low alloy content and large size of low-alloy large-scale die steel, it is easy to produce quenching cracks during heat treatment, thereby reducing the qualified rate of finished products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A heat treatment process for low-alloy large-scale die steel. The low-alloy large-scale die steel contains chemical components and the content of each component: carbon 0.1%, silicon 0.4%, chromium 0.6%, nickel 0.05%, molybdenum 0.03%, titanium 0.02%, iron 98.8%; the heat treatment process of the low-alloy large die steel includes the following steps:

[0016] a. Annealing: Put the low-alloy large mold steel into a high-temperature box furnace, argon gas is passed into the furnace, and the temperature is raised to 850°C, and the temperature is kept for 2 hours and then cooled with the furnace;

[0017] b. Quenching: Put the low-alloy large die steel that has been annealed to below 500°C in a quenching oil at a temperature of 40°C, and cool to below 150°C to produce the quenching oil;

[0018] c. Tempering: Put the quenched large-scale low-alloy die steel into a tempering furnace, heat up to 300°C, keep it for 1h, continue to heat up to 500°C, keep it for 2h, and then cool to r...

Embodiment 2

[0022] A heat treatment process for low-alloy large-scale die steel. The low-alloy large-scale die steel contains chemical components and the content of each component: carbon 0.1%, silicon 0.5%, chromium 0.8%, nickel 0.05%, molybdenum 0.02%, titanium 0.04%, iron 98.49%; the heat treatment process of the low-alloy large die steel includes the following steps:

[0023] a. Annealing: Put the low-alloy large mold steel into a high-temperature box furnace, argon gas is introduced into the furnace, and the temperature is raised to 870°C, and the temperature is kept for 2.5 hours and then cooled with the furnace;

[0024] b. Quenching: Put the low-alloy large die steel that has been annealed to below 500°C in quenching oil at a temperature of 50°C, and cool to below 150°C to produce the quenching oil;

[0025] c. Tempering: Put the quenched large-scale low-alloy die steel into a tempering furnace, heat up to 320°C, hold for 1.5h, continue to heat up to 520°C, hold for 2.5h, and then cool t...

Embodiment 3

[0029] A heat treatment process for low-alloy large-scale die steel. The chemical components and contents of the low-alloy large-scale die steel are: carbon 0.2%, silicon 0.2%, chromium 0.5%, nickel 0.1%, molybdenum 0.08%, titanium 0.01%, iron 98.91%; the heat treatment process of the low-alloy large die steel includes the following steps:

[0030] a. Annealing: Put the low-alloy large mold steel into a high-temperature box furnace, and argon gas is introduced into the furnace, and the temperature is increased to 900°C, and the temperature is kept for 3 hours and then cooled with the furnace;

[0031] b. Quenching: Put the low-alloy large die steel that has been annealed to below 500°C into a quenching oil at a temperature of 60°C, and cool to below 150°C to produce the quenching oil;

[0032] c. Tempering: Put the quenched large-scale low-alloy die steel into a tempering furnace, heat it up to 350°C, hold it for 2h, continue to heat up to 550°C, hold it for 3h, and then cool it down...

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Abstract

The invention discloses a heat treatment process of low-alloy large-scale die steel, which contains chemical components and the content of each component: carbon 0.1%-0.2%, silicon 0.2%-0.5%, chromium 0.5%-0.8%, nickel 0.05% %-0.1%, molybdenum 0.02%-0.08%, titanium 0.01%-0.04%, and the rest are iron; the heat treatment process of the low-alloy large die steel includes the following steps: a, annealing; b, quenching: cooling to Put the low-alloy large-scale die steel below 500°C into the quenching liquid, cool to below 150°C, and release the quenching liquid; c, tempering. Through the above method, the present invention can effectively avoid the generation of quenching cracks by optimizing the content of alloy elements and rationally controlling the heating temperature, holding time, heating rate and other process parameters during the heat treatment process, thereby improving the qualified rate of finished products.

Description

Technical field [0001] The invention relates to the technical field of heat treatment, in particular to a heat treatment process of low-alloy large die steel. Background technique [0002] Die steel is used to make cold die, hot forging die, die casting die and other steel types. Moulds are the main processing tools for manufacturing parts in industrial sectors such as machinery manufacturing, radio instruments, motors, and electrical appliances. The quality of the mould directly affects the quality of the pressure processing process, the accuracy of the product, the output and the production cost, and the quality and service life of the mould In addition to relying on reasonable structural design and processing accuracy, it is mainly affected by mold materials and heat treatment. Due to the low alloy content and large size, low-alloy large die steels are prone to quenching cracks during heat treatment, thereby reducing the qualified rate of finished products. Summary of the in...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/18C22C38/08C22C38/12C22C38/14C21D1/26C21D1/18C21D6/00
CPCC22C38/02C21D1/18C21D1/26C21D6/004C21D6/008C22C38/08C22C38/12C22C38/14C22C38/18
Inventor 陈加兵
Owner TAICANG HUTAI HOT PROCESSING PLANT
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