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Manufacturing method for remanence-free mold steel

A production method and technology of die steel, applied in the field of metallurgy, can solve problems such as poor degaussing effect, reduce tool life, affect production efficiency, etc., achieve performance and process stability control, improve production efficiency, and eliminate magnetism.

Inactive Publication Date: 2018-11-27
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the mold steel needs to be transported by a disk crane during the mass production process, the magnetic field of the mold steel during the transfer process is tested, and the magnetic range is 30-50 Gauss. 40 gauss, and it takes more than 15 minutes to demagnetize a steel plate, not only the degaussing effect is not good, but also affects the production efficiency, and the higher magnetism will make it difficult to arrange pins during mold processing, greatly reducing the service life of the tool

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The manufacturing method of a kind of non-remanent magnetism mold steel provided by the present embodiment comprises the following steps:

[0019] The rolled 2311 steel plate is subjected to normalizing heat treatment, the heating temperature is 889°C, the heating rate is 1.2min / mm, and the holding time is 0.8min / mm;

[0020] The heating temperature of tempering heat treatment is 566°C, the heating rate is 2.0min / mm, and the holding time is 3.0min / mm;

[0021] After heat treatment, all transfer processes are carried out by means of vacuum chucks or fixtures, and at the same time, remanence inspections are carried out on the head, middle and tail of the steel plate.

[0022] The test results are: 3 spot checks on the whole plate, and the residual magnetism is 0GS, which meets the magnetic requirements of the steel plate.

Embodiment 2

[0024] The manufacturing method of a kind of non-remanent magnetism mold steel provided by the present embodiment comprises the following steps:

[0025] The rolled 718 steel plate is subjected to normalizing heat treatment, the heating temperature is 890°C, the heating rate is 1.2min / mm, and the holding time is 0.8min / mm;

[0026] The heating temperature of tempering heat treatment is 580°C, the heating rate is 2.0min / mm, and the holding time is 3.1min / mm;

[0027] After heat treatment, all transfer processes are carried out by means of vacuum chucks or fixtures, and at the same time, remanence inspections are carried out on the head, middle and tail of the steel plate.

[0028] The test results are: 3 spot checks on the whole plate, 2GS residual magnetism, meeting the magnetic requirements of the steel plate.

[0029] The invention is a manufacturing method of mold steel without residual magnetism, adopts appropriate heat treatment process, and reasonable hoisting and trans...

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Abstract

The invention discloses a manufacturing method for remanence-free mold steel and relates to the technical field of metallurgy. The method comprises the following steps: performing normalizing thermaltreatment on a rolled steel plate, wherein the heating temperature is 880-900 DEG C, the heating rate is 1-1.5 min / mm and the insulating time is 0.6-1.0 min / mm; setting reasonable heating temperature,heating rate and insulating time of tempering thermal treatment according to different mold steel types; adopting a vacuum chuck or jig for performing all the transporting processes after thermal treatment, and meanwhile performing remanence test on head, middle and tail parts of the steel plate, thereby meeting the magnetic requirement of the steel plate. According to the invention, the thermaltreatment technology for the rolled mold steel is optimized for eliminating the magnetism of the mold steel, and meanwhile, the devices, such as the vacuum sucker and the jig, are equipped in the hoisting and transporting processes, and the requirement for remanence-free performance is met.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for manufacturing a mold steel without residual magnetism. Background technique [0002] With the rapid development of modern iron and steel smelting level, the mold steel market has become increasingly fierce, and users have increasingly strict requirements on the performance of products. The characteristics of high quality and low price have not attracted the attention of customers. Value-added high-grade plastic mold steel varieties are imperative, including non-remanent magnetism mold steel. Since the mold steel needs to be transported by a disk crane during the mass production process, the magnetic field of the mold steel during the transfer process is tested, and the magnetic range is 30-50 Gauss. 40 gauss, and it takes more than 15 minutes to demagnetize a steel plate. Not only the degaussing effect is not good, but also the production efficiency is affected. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D8/12
CPCC21D1/28C21D8/1244
Inventor 高飞
Owner NANJING IRON & STEEL CO LTD
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