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A kind of high nitrogen type hot work die steel and its preparation method

A technology of hot work die steel and high nitrogen type, which is applied in the field of hot work die steel, can solve the problems of low service temperature and insufficient strength, achieve fine dispersion of carbides, uniform structure, and improve mechanical properties and performance.

Active Publication Date: 2020-07-24
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, hot work die steel is generally H13 steel. H13 steel is C-Cr-Mo-Si-V martensitic hot work die steel. It is the most widely used and most representative hot work die steel. It has relatively High hardenability and toughness, excellent thermal stability and thermal fatigue resistance, but the service temperature is not higher than 540 ° C, and the strength is not high enough

Method used

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  • A kind of high nitrogen type hot work die steel and its preparation method
  • A kind of high nitrogen type hot work die steel and its preparation method
  • A kind of high nitrogen type hot work die steel and its preparation method

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Effect test

Embodiment 1

[0044] The steel chemical composition of high nitrogen type hot work die steel in the present embodiment is as follows (by weight percentage):

[0045] C Si mn P S Cr Mo V N 0.37％ 0.97％ 0.41％ 0.008％ 0.004％ 5.48％ 1.33％ 1.02％ 0.0170％

[0046] The preparation method of high nitrogen type hot work die steel in the present embodiment is as follows:

[0047] (1) Smelting: Smelting is carried out in an induction furnace according to the above-mentioned ratio of alloy elements, and the melting temperature is 1550°C, and cast into electrode rods.

[0048] (2) Forging: Using a multi-stage heating method, the above-mentioned steel ingot is heated to 1180°C for multi-directional forging processing, and the forging method with two piers and two draws is adopted, and the final forging temperature is 900°C;

[0049] (3) Cooling: Controlled cooling of the forged billet after forging, using oil cooling or water cooling to quickly cool to about 400°C, and th...

Embodiment 2

[0053] The steel chemical composition of high nitrogen type hot work die steel in the present embodiment is as follows (by weight percentage):

[0054] C Si mn P S Cr Mo V N 0.40％ 1.12％ 0.44％ 0.008％ 0.003％ 5.33％ 1.3％ 1.01％ 0.0294％

[0055] The preparation method of the high-nitrogen type hot work die steel in this embodiment is the same as that of the above-mentioned embodiment 1.

Embodiment 3

[0057]The steel chemical composition of high nitrogen type hot work die steel in the present embodiment is as follows (by weight percentage):

[0058] C Si mn P S Cr Mo V N 0.37％ 0.80％ 0.30％ 0.009％ 0.004％ 5.0％ 1.20％ 0.80％ 0.0150％

[0059] The preparation method of the high-nitrogen type hot work die steel in this embodiment is the same as that of the above-mentioned embodiment 1.

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Abstract

The invention concretely relates to high-nitrogen type hot work die steel and a preparation method therefor, and belongs to the technical field of hot work die steel. The high-nitrogen type hot work die steel comprises the following chemical components: 0.37-0.42 % by weight of C, 0.80-1.20 % by weight of Si, 0.30-0.50 % by weight of Mn, 5.0-5.50 % by weight of Cr, 1.20-1.75 % by weight of Mo, 0.80-1.20 % by weight of V, less than 0.010 % by weight of P, less than 0.005 % by weight of S, 0.15-0.30 % by weight of N and the balance Fe.

Description

technical field [0001] The invention belongs to the technical field of hot work die steel, and in particular relates to a high-nitrogen hot work die steel and a preparation method thereof. Background technique [0002] The hot work mold is the main tool used for liquid metal forming. Its service conditions are complex, and it has been subjected to alternating loads under high temperature, high pressure, and intense cooling and heat conditions for a long time, which is likely to cause thermal fatigue cracks on the surface of the mold and cause failure. Therefore, heat is required. Die steel has high strength and toughness, high thermal strength and good thermal fatigue performance. [0003] At present, hot work die steel is generally H13 steel. H13 steel is C-Cr-Mo-Si-V martensitic hot work die steel. It is the most widely used and most representative hot work die steel. It has relatively High hardenability and high toughness, excellent thermal stability and thermal fatigue ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/24C22C38/22C22C38/04C22C38/02C22C33/04C21D8/00C21D1/26
CPCC21D1/26C21D8/005C21D2211/005C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 佟倩吕迺冰马跃彭仕江孙齐松黄祥徐士新王勇
Owner SHOUGANG CORPORATION
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