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Flake prevention control method for age hardening type plastic mold steel

A plastic mold steel and control method technology, applied in the field of metal heat treatment, can solve the problems of not being able to completely eliminate white spots, long annealing time, and large energy consumption, so as to avoid white spot defects, save production time, and reduce energy consumption Effect

Active Publication Date: 2018-08-24
FUSHUN SPECIAL STEEL SHARES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current dehydrogenation annealing process takes a long time for annealing and consumes a lot of energy, and at the same time, it cannot completely eliminate the occurrence of white spots.

Method used

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  • Flake prevention control method for age hardening type plastic mold steel
  • Flake prevention control method for age hardening type plastic mold steel
  • Flake prevention control method for age hardening type plastic mold steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 10Ni3MnCuAl finished flat steel, the size and shape are 126mm×810mm.

[0035] 1. Smelting: UHP+LF+VD smelting electrodes are used, and the hydrogen content of the steel is 1.8×10 -6 , electroslag furnace electroslag remelting Φ750mm electroslag ingot;

[0036] 2. Forging: One upsetting and one pulling production, forging ratio 7.6, upsetting ratio 2, final forging temperature 870°C;

[0037] 3. Heat treatment: After forging, the finished flat steel is sent to heat treatment. The solid solution temperature is 880°C. After solid solution, it is tempered for a period of time. After heat preservation, it is cooled to 200°C with the furnace and released from the furnace.

[0038] 4. Physical and chemical test results

[0039] ① The results of chemical composition analysis of flat steel are shown in Table 1.

[0040] Table 1

[0041]

[0042] ②After heat treatment, the finished material shall be inspected according to SEP1921 ultrasonic flaw detection, and shall meet t...

Embodiment 2

[0045] 10Ni3MnCuAl finished flat steel, the size and shape are 180mm×680mm.

[0046] 1. Smelting: UHP+LF+VD smelting electrodes are used, and the hydrogen content of the steel is 2.0×10 -6 , electroslag furnace electroslag remelting Φ610mm electroslag ingot;

[0047] 2. Forging: Two upsetting and two drawing production, forging ratio 6.3, upsetting ratio 2, final forging temperature 870°C;

[0048] 3. Heat treatment: After forging, the finished flat steel is sent to heat treatment. The solid solution temperature is 880°C. After solid solution, it is tempered for a period of time. After heat preservation, it is cooled to 200°C with the furnace and released from the furnace.

[0049] 4. Physical and chemical test results

[0050] ① See Table 2 for the analysis results of the chemical composition of the flat steel.

[0051] Table 2

[0052]

[0053] ②After heat treatment, the finished material shall be inspected according to SEP1921 ultrasonic flaw detection, and shall mee...

Embodiment 3

[0056] 10Ni3MnCuAl finished flat steel, the size and shape are 280mm×605mm.

[0057] 1. Smelting: UHP+LF+VD smelting electrodes are used, and the hydrogen content of the steel is 1.6×10 -6 , electroslag furnace electroslag remelting Φ750mm electroslag ingot;

[0058]2. Forging: Two upsetting and two drawing production, forging ratio 6.8, upsetting ratio 2, final forging temperature 880°C;

[0059] 3. Heat treatment: After forging, the finished flat steel is sent for heat treatment. The solid solution temperature is 880°C. After solid solution, two-stage tempering treatment is carried out. After heat preservation, it is cooled to 350°C with the furnace and then cooled to 100°C at 20°C / h to be released from the furnace.

[0060] 4. Physical and chemical test results

[0061] ① See Table 3 for the analysis results of the chemical composition of the flat steel.

[0062] table 3

[0063]

[0064] ②After heat treatment, the finished material shall be inspected according to SE...

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Abstract

the invention discloses a flake prevention control method for age hardening type plastic mold steel. The method aims to prevent flakes from being generated after forging. In order to achieve the aim,the technical scheme of the method is characterized in that dehydrogenation annealing is not carried out after forging, solid solution treatment is directly carried out, the solid solution treatment process is directly carried out, so that hydrogen in the steel is directly and uniformly fixed in the steel before being accumulated, the hydrogen concentration for generating the flakes is not reached, and therefore the occurrence of the defects of the flakes can be avoided; and a proper tempering process is coordinated, residual stress in the steel is fully removed, and therefore the occurrence of the flakes can be prevented. Compared with the prior art, the method has the following advantages that 1, the dehydrogenation annealing process after forging is omitted, solid solution treatment isdirectly carried out after forging, then through a proper tempering process after solid solution treatment, the flakes can be prevented from being generated, meanwhile, the finished flat steel is pre-hardened, and the hardness is uniform; and 2, the production time is saved, the occupation of a furnace platform is reduced, the energy consumption is reduced, and therefore the production cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, and in particular relates to an anti-white spot control method for aging-hardening plastic mold steel. Background technique [0002] Die steel is a special alloy steel, and 10Ni3MnCuAl is an age-hardening plastic mold steel, which belongs to low alloy precipitation hardening steel. The outstanding feature of 10Ni3MnCuAl steel is that it becomes soft after solution treatment, and can be cold-worked. After it is made into a mold, it can be subjected to aging treatment, which not only ensures its performance but also reduces heat treatment deformation; the steel has good comprehensive mechanical properties and high hardenability. It has good polishing performance, nitriding performance, electrical processing performance, welding repair performance and pattern etching performance, suitable for making large plastic molds, and can also be used for making die-casting molds for low melting p...

Claims

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Application Information

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IPC IPC(8): C21D8/00C22C38/04C22C38/02C22C38/12C22C38/08C22C38/16C22C38/06
Inventor 燕云冯淑玲刘宝石孙秀华马野曹莹刘明岳彩超刘晓牟风汝亚彬杨天亮康爱军秋立鹏王琳张正君孙大利王旭林于海鹏郑继辉
Owner FUSHUN SPECIAL STEEL SHARES
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