Rapid hydrogen diffusion treatment method for nitrogen alloying anti-corrosion die steel

A nitrogen alloying and die steel technology is applied in the field of hydrogen diffusion heat treatment, which can solve the problem of long hydrogen diffusion time, and achieve the effects of increasing the diffusion speed, shortening the post-forging heat treatment cycle, and reducing energy consumption.

Active Publication Date: 2013-08-21
HUBEI SHANGDA MODEL MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogen expansion time is longer

Method used

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  • Rapid hydrogen diffusion treatment method for nitrogen alloying anti-corrosion die steel
  • Rapid hydrogen diffusion treatment method for nitrogen alloying anti-corrosion die steel
  • Rapid hydrogen diffusion treatment method for nitrogen alloying anti-corrosion die steel

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Experimental program
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Effect test

Embodiment 1

[0022] Hydrogen expansion treatment method after forging of nitrogen alloyed corrosion-resistant die steel forging module with a thickness of 300 mm (see image 3 ): After the nitrogen alloyed corrosion-resistant die steel is forged, the temperature is raised to 690-710°C and kept for 15 hours; Austenite transformation occurs in the surface area, causing the solubility of hydrogen on the surface of the nitrogen alloyed corrosion-resistant die steel to be higher than that in the inner area, and there is a gradient of hydrogen solubility on the cross-section of the nitrogen-alloyed corrosion-resistant die steel; after 2 Cool down to 690-710°C within 1 hour, and keep it warm for 10 hours; then cool down to below 250°C and leave the oven.

Embodiment 2

[0024] Hydrogen expansion treatment method after forging of nitrogen alloyed corrosion-resistant die steel forging module with a thickness of 350 mm (see Figure 4 ): After nitrogen alloying corrosion-resistant die steel is forged, the temperature is raised to 690-710°C and held for 21 hours; then the temperature is raised to 820-840°C in the austenite region for 2 hours and held for 3.5 hours to make the nitrogen-alloyed corrosion-resistant die steel Austenite transformation occurs in the surface area, causing the solubility of hydrogen on the surface of the nitrogen alloyed corrosion-resistant die steel to be higher than that in the inner area, and there is a gradient of hydrogen solubility on the cross-section of the nitrogen-alloyed corrosion-resistant die steel; after 2 Cool down to 690-710°C within 1 hour, and keep it warm for 12 hours; then cool down to below 250°C and leave the oven.

Embodiment 3

[0026] Hydrogen expansion treatment method after forging of nitrogen alloyed corrosion-resistant die steel forging module with a thickness of 450 mm (see Figure 5 ): After forging nitrogen alloyed corrosion-resistant die steel, raise the temperature to 690-710°C and hold it for 26 hours; Austenite transformation occurs in the surface area, causing the solubility of hydrogen on the surface of the nitrogen alloyed corrosion-resistant die steel to be higher than that in the inner area, and there is a gradient of hydrogen solubility on the cross-section of the nitrogen-alloyed corrosion-resistant die steel; after 3 Cool down to 690-710°C within 1 hour, and keep it warm for 18 hours; then cool down to below 250°C and take out the oven.

[0027] The present invention adopts the rapid hydrogen expansion treatment process for the forging module of the nitrogen alloyed corrosion-resistant die steel with a thickness of 300-450 mm, shortens the hydrogen expansion treatment time by 29...

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Abstract

The invention relates to an as-forged rapid hydrogen diffusion treatment method for a nitrogen alloying anti-corrosion die steel, which comprises the following steps of: after forging the nitrogen alloying anti-corrosion die steel, heating to the temperature of 690 to 710 DEG C and carrying out heat preservation according to the heat preservation time of 5 to 6 hours per 100mm of the nitrogen alloying anti-corrosion die steel; heating to 820 to 840 DEG C in an austenite region in 1 to 2 hours and carrying out heat preservation; cooling to the temperature of 690 to 710 DEG C in 2 to 3 hours and carrying out heat preservation according to the heat preservation time of 3 to 4 hours per 100mm of the nitrogen alloying anti-corrosion die steel; and then cooling to the temperature of below 250 DEG C. According to the invention, by a method of circularly heating up and down near a phase transformation point, the tissues of the nitrogen alloying anti-corrosion die steel are transformed repeatedly from austenite to pearlite and the diffusion of hydrogen in the steel is quickened by utilizing the change of the solubility of the hydrogen in different tissues, so that the as-forged hydrogen diffusion treatment time of the nitrogen alloying anti-corrosion die steel is shortened.

Description

technical field [0001] The invention relates to the heat treatment of mold steel in the metallurgical industry, in particular to the hydrogen expansion heat treatment of the forging module of the nitrogen alloyed corrosion-resistant mold steel. Background technique [0002] With the rapid development of industrial technology, precision stamping, pressure casting, cold extrusion, hot extrusion and other non-cutting and less-cutting processes are widely used in domestic and foreign manufacturing industries, and molds have become their main forming tools. developed rapidly within. There are many kinds of plastic products, auto parts such as: lampshades, instrument panels, optical instrument parts such as lenses, housings of household appliances, PVC daily-use plastic products, etc. Among them, the plastic used in the housing of home appliances is ABS+flame retardant. Some plastics, such as polyvinyl chloride, fluoroplastics, flame-retardant ABS, etc., will decompose corrosive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/74C21D8/00
Inventor 李民华
Owner HUBEI SHANGDA MODEL MATERIAL TECH
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