Production process of hot work die steel with high thermal conductivity and high heat strength

A technology for hot work die steel and production process, applied in the field of hot work die steel, can solve the problems of difficulty in meeting the high temperature service conditions of hot work die steel, reduction in thermal conductivity and toughness of die steel, and difficulty in simultaneously improving strength and toughness, etc. To achieve the effect of short melting time, improved hardenability and good toughness

Pending Publication Date: 2022-07-05
冯希良
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The currently widely used hot work die steel is medium-alloy chromium-based H13 steel (4Cr5MoSiV1). H13 steel has good strength, toughness, and thermal fatigue resistance below 550 °C, but its strength and thermal stability drop sharply when it exceeds 600 °C. decline, it is difficult to meet the high temperature service conditions of hot work die steel
[0004] In order to improve the service temperature and high temperature strength of hot work die steel, H13 steel is also improved in the prior art, by increasing the carbon content and adding a small amount of W and other elements to improve the high temperature strength, such as the 3Cr2W8V hot work die steel in the prior art, However, with the increase of carbon content and the increase of W element, the thermal conductivity and toughness of die steel are greatly reduced, and it is difficult to simultaneously improve the strength and toughness only from the perspective of composition ratio

Method used

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  • Production process of hot work die steel with high thermal conductivity and high heat strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The present embodiment prepares a nucleation aid, and the specific implementation process is as follows:

[0024] Step A1: configure an ethanol aqueous solution with a volume fraction of 40%, and pour the ethanol aqueous solution into the water tank of an ultrasonic disperser to obtain a dispersion system;

[0025] Step A2: Take nano carbon powder, nano boron nitride and nano tantalum powder (sodium-reduced tantalum powder) according to the weight ratio of 1:2.2:0.8, mix them and pour them into the dispersion system, ultrasonically disperse them at 28kHz for 20min, and then let stand for 10h ;

[0026] Step A3: Add silane coupling agent KH550 to the standing water tank, and then ultrasonically disperse at 28 kHz for 20 min. After ultrasonic dispersion, the dispersion liquid is centrifuged and then evaporated to dryness, and the dispersion liquid is removed to obtain a nucleating aid.

Embodiment 2

[0028] Step A1: configure an ethanol aqueous solution with a volume fraction of 40%, and pour the ethanol aqueous solution into the water tank of an ultrasonic disperser to obtain a dispersion system;

[0029] Step A2: Take nano-carbon powder, nano-boron nitride and nano-tantalum powder (sodium-reduced tantalum powder) according to the weight ratio of 1:2.5:0.7, mix them, pour them into the dispersion system, ultrasonically disperse them at 28kHz for 20min, and then let stand for 10h ;

[0030] Step A3: Add silane coupling agent KH550 to the standing water tank, and then ultrasonically disperse at 28 kHz for 20 min. After ultrasonic dispersion, the dispersion liquid is centrifuged and then evaporated to dryness, and the dispersion liquid is removed to obtain a nucleating aid.

Embodiment 3

[0032] The present embodiment prepares high thermal conductivity and high thermal strength hot work die steel, and the specific implementation process is as follows:

[0033] Step S1: Make ingredients according to the following ingredients:

[0034] C: 0.32%;

[0035] W: 1.2%;

[0036] Mo: 3.6%;

[0037] V: 0.08%;

[0038] Mn: 0.1%;

[0039] Cr: 0.18%;

[0040] Si: 0.04%;

[0041] The balance is Fe and inevitable impurities;

[0042] The batches of the above components are added into the vacuum melting furnace and heated to 1450° C. to be smelted into molten steel. Before tapping, a powder blower is used to blow the nucleation aid prepared in Example 1 with a batch mass of 1.27% into the melting furnace. , control the tapping temperature to be 1550 °C, the casting temperature to be 1490 °C, and pour the molten steel into the mold to obtain the electrode rod;

[0043] Step S2: Install the electrode rod on the consumable electrode of the electroslag remelting furnace. Th...

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Abstract

The invention relates to a production process of high-heat-conductivity and high-heat-strength hot work die steel, and belongs to the technical field of hot work die steel. A base body of the die steel comprises 0.32%-0.38% of C, 1.2%-1.6% of W, 3.6%-4.2% of Mo, 0.08%-1.4% of V, 0.06%-0.1% of Mn, 0.15%-0.18% of Cr, 0.02%-0.04% of S i and the balance Fe, a nucleating auxiliary is added into the base body, the nucleating auxiliary is prepared from nanoscale carbon powder, boron nitride and tantalum powder, more crystal nucleuses are provided for the base body, tantalum and carbon form tantalum carbide at the high temperature, the effects of refining grains and improving heat conductivity are achieved, and the heat conductivity of the die steel is improved. Meanwhile, a high-melting-point strengthening phase formed by tantalum carbide and boron nitride forms dispersion strengthening, so that the strength of the matrix is improved; through testing, the hardness of the hot work die steel reaches 51.3-57.6 HRC at the temperature of 600 DEG C, and the heat conductivity coefficient of the hot work die steel reaches 28.7-31.2 w/m.K at the room temperature.

Description

technical field [0001] The invention belongs to the technical field of hot work die steel, and in particular relates to a production process of hot work die steel with high thermal conductivity and high heat intensity. Background technique [0002] Hot work die steel refers to alloy tool steel suitable for making dies for hot deformation processing of metals, such as hot forging dies, hot extrusion dies, die casting dies, hot upsetting dies, etc. Since the mold is in direct contact with the high temperature metal (800-1200°C), the temperature of the mold reaches 400-600°C. Therefore, the mold steel is required to have good high temperature strength, good thermal conductivity and wear resistance. [0003] The most widely used hot work die steel is medium alloy chromium-based H13 steel (4Cr5MoSiV1). H13 steel has good strength and toughness coordination and thermal fatigue resistance below 550 °C, but the strength and thermal stability are sharp when it exceeds 600 °C. It is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C21C7/00C21D1/18C21D8/02C22B9/18C22C33/04C21D6/00
CPCC22C38/22C22C38/24C22C38/04C22C38/02C22C33/04C22B9/18C21D8/0205C21D1/18C21C7/0037C21D6/002C21D6/005C21D6/008
Inventor 冯希良朱广
Owner 冯希良
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