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A Heat Treatment Process for Improving Hot Hardness and High Temperature Wear Resistance of Hot Die Steel

A hot-hardness and wear-resistance technology, which is applied in the field of heat treatment process for improving hot-hardness and high-temperature wear resistance of hot die steel, can solve the problems of complicated operation, insignificant effect and high production cost.

Active Publication Date: 2021-07-06
锦州捷通铁路机械股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above surface strengthening methods can improve the surface high temperature performance of hot die steel to varying degrees, they all have problems such as ineffective effects, high production costs, complicated operations, and not suitable for small and medium-sized enterprises.

Method used

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  • A Heat Treatment Process for Improving Hot Hardness and High Temperature Wear Resistance of Hot Die Steel
  • A Heat Treatment Process for Improving Hot Hardness and High Temperature Wear Resistance of Hot Die Steel
  • A Heat Treatment Process for Improving Hot Hardness and High Temperature Wear Resistance of Hot Die Steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (940℃×4h strong carburizing and nitriding, then heating up to 1040℃ for 0.5h oil cooling, 580℃×2h and 500℃×1h twice tempering)

[0045] (1) Sample preparation and preparation of strong carbon-nitrogen infiltration agent

[0046] The workpiece materials are H11, H13, and H21 hot die steels in the annealed state. The chemical compositions of the three test materials are shown in Table 1. The size of metallographic and hardness workpiece samples is Ф25×6mm, the size of worn workpiece samples is Ф40×4mm, and the surface roughness of workpiece samples is 0.8mm;

[0047] According to the weight percentage, the carbon-nitrogen strong infiltration agent is composed as follows: 4.5kg of charcoal with a particle size of ≤5mm, 5.3kg of urea particles with a particle size of 1mm-2mm, 0.15kg of sodium carbonate powder, chromic anhydride (CrO 3 ) 0.05kg mixed to obtain carbon-nitrogen strong infiltration agent;

[0048] (2) Strong carbonitriding

[0049] Weld the infiltration box ...

Embodiment 2

[0078] (1) Sample and preparation of strong carbon-nitrogen infiltration agent

[0079] The workpiece materials are H11, H13, and H21 hot die steels in the annealed state. The chemical compositions of the three test materials are shown in Table 1. The size of metallographic and hardness workpiece samples is Ф25×6mm, the size of worn workpiece samples is Ф40×4mm, and the surface roughness of workpiece samples is 0.8mm;

[0080] According to the weight percentage, the carbon-nitrogen strong infiltration agent is composed as follows: 4.3kg of charcoal with a particle size of ≤5mm, 5.5kg of urea particles with a particle size of 1mm-2mm, 0.12kg of sodium carbonate powder, chromic anhydride (CrO 3 ) 0.08kg mixed to obtain carbon-nitrogen strong infiltration agent;

[0081] (3) Strong carbonitriding

[0082] Weld the infiltration box with 6mm thick 1Cr18Ni9Ti stainless steel plate on both sides, put H11 hot mold steel workpiece, H13 hot mold steel workpiece and H21 hot mold steel ...

Embodiment 3

[0088] (1) Sample and preparation of strong carbon-nitrogen infiltration agent

[0089] The workpiece materials are H11, H13, and H21 hot die steels in the annealed state. The chemical compositions of the three test materials are shown in Table 1. The size of metallographic and hardness workpiece samples is Ф25×6mm, the size of worn workpiece samples is Ф40×4mm, and the surface roughness of workpiece samples is 0.8mm;

[0090] According to the weight percentage, the carbon-nitrogen strong infiltration agent is composed as follows: 4.8kg of charcoal with a particle size of ≤5mm, 5.0kg of urea particles with a particle size of 1mm-2mm, 1.4kg of sodium carbonate powder, chromic anhydride (CrO 3 ) 0.6kg mixed to obtain carbon-nitrogen strong infiltration agent;

[0091] (3) Strong carbonitriding

[0092] Weld the infiltration box with 6mm thick 1Cr18Ni9Ti stainless steel plate on both sides, put H11 hot mold steel workpiece, H13 hot mold steel workpiece and H21 hot mold steel wo...

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Abstract

A heat treatment process for improving the thermal hardness and high temperature wear resistance of hot mold steel, mixing charcoal, urea particles, sodium carbonate powder and chromic anhydride to obtain a strong carbon-nitrogen binder; Put it into the infiltration box, seal the box cover of the infiltration box; put the infiltration box in a crucible electric furnace at a constant temperature of 850°C to 950°C for strong carbonitriding, and then after quenching, immerse the hot molded steel workpiece directly in quenching oil After cooling and air cooling, put it into a box-type medium-temperature tempering furnace for two temperings to obtain hot mold steel workpieces with high thermal hardness, high temperature and high wear resistance. The advantages are: easy operation, low cost and obvious effect, the surface hardness of the obtained hot mold steel can reach above 62HRC, and the high temperature wear resistance at 600 ℃ is more than twice that of the conventional heat treatment parts of the same kind of hot mold steel, which can effectively Improve the service life of hot work dies.

Description

technical field [0001] The invention relates to a heat treatment process for improving the thermal hardness and high-temperature wear resistance of hot die steel, in particular to a heat treatment process for commonly used hot die steel with high alloy content, such as 4Cr5MoSiV (H11), 4Cr5MoSiV1 (H13), 3Cr2W8V (H21 ), through strong carburizing and nitrogen elements to increase the carbon and nitrogen content in the surface layer, and then perform quenching composite heat treatment to improve the thermal hardness and high temperature wear resistance of hot mold steel. Background technique [0002] Hot work die steel is a type of steel used to make high-temperature solid and liquid metal forming dies in the production of thermal processing of metal products. Hot working dies mainly include hot forging dies, hot extrusion dies, die-casting dies, etc. During the production process of hot forming, the dies will bear greater pressure and impact force, and at the same time, after...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/76C21D1/18
CPCC21D1/18C23C8/76
Inventor 苗昕旺谷志刚臧玉郡王丹丹刘希德宋佳健孙明马宇李金红
Owner 锦州捷通铁路机械股份有限公司
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