High manganese and low chromium type high strength and toughness hot-work die steel and preparation method thereof

A hot work die steel, high strength and toughness technology, applied in the field of alloy steel manufacturing process, can solve the problems of low thermal strength, plastic toughness, poor thermal fatigue performance of thermal conductivity, collapse of the working part of the mold, etc., to achieve high thermal stability, Effect of Good Impact Toughness and Thermal Fatigue Properties

Inactive Publication Date: 2009-03-25
SHANGHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although the tungsten-based 3Cr2W8V has high tempering resistance and high thermal strength, its plasticity, toughness, thermal conductivity and the...

Method used

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  • High manganese and low chromium type high strength and toughness hot-work die steel and preparation method thereof
  • High manganese and low chromium type high strength and toughness hot-work die steel and preparation method thereof
  • High manganese and low chromium type high strength and toughness hot-work die steel and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0028] In this example, the composition and weight percentage of the hot work die steel are as follows:

[0029] C 0.41%, Si 0.33%, Mn 0.99%, Cr 2.36%, Mo 1.61%,

[0030] V 1.02%, W 1.53%, P 0.01%, S 0.01%, Fe balance.

[0031] In the present embodiment, the technical process and steps of hot work die steel are as follows:

[0032] a. Induction smelting: smelting in an induction furnace according to the above-mentioned ratio of alloying elements, and the melting temperature is greater than 1500

[0033] ℃, then cast into Φ80mm steel ingot and air-cooled;

[0034] b. Electroslag remelting: the poured steel ingot is placed in the electroslag remelting device as a consumable electrode for electroslag remelting, and the liquid metal falls through the slag layer of the slag pool to the water-cooled crystallizer below. re-solidified into steel ingots;

[0035] c. High-temperature homogenization: heat the steel ingot after electroslag remelting to 1250°C for high-temperature homo...

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Abstract

The invention relates to a high-manganese and low chromium type high-obdurability hot-work die steel, pertaining to the technical field of alloy steel manufacturing process. The constituents of the steel and the weight percent are as follows: C: 0.3 percent to 0.6 percent, Si: 0.1 percent to 0.5 percent, Mn: 0.5 percent to 1.5 percent, Cr: 1.5 percent to 4.0 percent, Mo: 1.0 percent to 3.0 percent, V: 0.4 percent to 1.3 percent, W: 0.5 percent to 2.0 percent, P: less than 0.02 percent, S: less than 0.02 percent and Fe as the rest. The preparation process of the hot-work die steel is as follows: material distribution, induction smelting and molding, followed by electroslag remelting; at the temperature of 1,200 DEG C to 1,280 DEG C, homogenization treatment is carried out for 8h to 10h, then forging and annealing are carried out, the materials are heated to the temperature of 1,000 DEG C to 1,100 DEG C for austenization, and two times of tempering are carried out at the temperature of 580 DEG C to 640 DEG C after oil quenching or high-pressure air quenching. The hot-work die steel has high thermal stability, high heat resistance and good thermal fatigue property.

Description

technical field [0001] The invention relates to a high-manganese and low-chromium high-strength hot work die steel and a preparation method thereof. The die steel not only has high thermal stability, but also has good toughness and thermal fatigue performance, and belongs to the technical field of alloy steel manufacturing technology. Background technique [0002] The working conditions of hot work die steel are complicated, and it needs to be in contact with the heated blank or even liquid metal for a long time during work. When the hot metal is put into the cavity of the hot work die, the surface of the cavity will heat up sharply, and the surface layer will generate compressive stress and Compressive strain; when the metal parts are taken out, the surface of the cavity is subject to tensile stress and tensile strain due to the sharp drop in temperature, which is prone to thermal fatigue, etc., and the hot work die steel is also subjected to a large impact load during servi...

Claims

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Application Information

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IPC IPC(8): C22C38/24C21D8/00C21D1/18
Inventor 吴晓春陈英伟吕广奇闵永安张伟
Owner SHANGHAI UNIV
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