H13 die steel heat treating method and H13 die steel obtained through same

A heat treatment method and die steel technology, applied in the heat treatment of H13 die steel, in the field of H13 die steel, can solve the problems of steel ingot oxidation loss, decarburization, abnormal grain growth, long residence time, etc.

Inactive Publication Date: 2015-10-28
BEIJING AOPU KEXING TECH
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  • Application Information

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Problems solved by technology

However, high-temperature diffusion has the following two deficiencies: 1) In order to achieve the optimal diffusion effect, it is necessary to increase the diffusion temperature as much as possible, increase the diffusion time, and minimize the segregation index of metal elements; high temperature and long-term diffusion will cause Decarburization and abnormal growth of grains, and a large amount of oxidation loss in the steel ingot; and 2) Special refinement methods are required to restore the grown grains after high temperature diffusion
In this case, since the dendrites of the unforged remelted ingot are larger, the segregated elements need to diffuse over a larger distance, so high temperature diffusion requires a long residence time

Method used

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  • H13 die steel heat treating method and H13 die steel obtained through same
  • H13 die steel heat treating method and H13 die steel obtained through same
  • H13 die steel heat treating method and H13 die steel obtained through same

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Embodiment 1

[0023] The heat treatment method of H13 mold steel, it may further comprise the steps:

[0024] Step 1. Heat forging the H13 steel ingot obtained after electroslag remelting, using two upsetting and two drawing processes, heating to 850-1180°C to break dendrites and the segregation area between dendrites, and the initial forging temperature is 1180 °C, the final forging temperature is 850 °C;

[0025] The first upsetting is to less than 50% of the height of the original steel ingot. The equipment is Lanshi Heavy Industry 3150T free forging press, and then it is stretched to 120% of the original length. After the first upsetting process, the billet is returned to the furnace for at least 3 hours;

[0026] After the second upsetting process, the billet is heated to 1240°C and held for 6 hours, and then drawn into shape. This process is completed in two times. The first day is upsetting twice, and the second day is formed. The draft ratio of more than 1.5 should be reserved for...

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Abstract

The invention relates to an H13 die steel heat treating method and H13 die steel obtained through the same. The H13 die steel heat treating method comprises the steps that a steel ingot obtained through electroslag remelting is heated and forged through the two-time upsetting and two-time stretching technology; three-stage heat insulation treatment is carried out on the forged steel ingot, particularly, first-stage heat insulation is carried out at the temperature of 390-410 DEG C with heat insulation time being 90-100 s / 1 mm thick steel, second-stage heat insulation is carried out at the temperature of 640-660 DEG C with heat insulation time being 70-110 s / 1 mm thick steel, and third-stage heat insulation is carried out at the temperature of 890-910 DEG C with heat insulation time being 60-110 s / 1 mm thick steel. In addition, the invention further relates to the H13 die steel obtained through the H13 die steel heat treating method.

Description

technical field [0001] The invention relates to a heat treatment method for alloys, in particular to a heat treatment method for H13 die steel. The invention also relates to the H13 mold steel obtained by this treatment method. Background technique [0002] 4Cr5MoSiV1 (American standard H13 die steel) is an alloy hot work die steel, which has good comprehensive mechanical properties and thermal strength, cold and heat fatigue resistance and liquid metal erosion resistance at temperatures from room temperature to 650 °C , Has been widely used in forging press dies, aluminum alloy die-casting dies and hot extrusion dies. It is considered to be the most widely used type of hot work die steel in the world. Since 1995, H13 die steel has been the most widely used hot work die steel in China. The most common and most difficult to eliminate microstructure inhomogeneity in the production of H13 die steel-banded structure is caused by the uneven distribution of alloying elements in...

Claims

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Application Information

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IPC IPC(8): C21D8/00C21D6/00
Inventor 张代轩薛道荣
Owner BEIJING AOPU KEXING TECH
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