Heat treatment process improving hot hardness and high temperature abrasion resisting performance of hot mold steel

A technology of thermal hardness and wear resistance, which is applied in the field of heat treatment process to improve the thermal hardness and high temperature wear resistance of hot mold steel, and can solve the problems of inconspicuous effect, high production cost, and unsuitable for small and medium-sized enterprises

Active Publication Date: 2019-12-13
锦州捷通铁路机械股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Heat treatment process improving hot hardness and high temperature abrasion resisting performance of hot mold steel
  • Heat treatment process improving hot hardness and high temperature abrasion resisting performance of hot mold steel
  • Heat treatment process improving hot hardness and high temperature abrasion resisting performance of hot mold steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0045] (1) Sample preparation and preparation of strong carbonitriding mixture

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

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

[0048] (2) Strong carburizing

[0049] Use 6mm thick 1Cr18Ni9Ti stainless steel plate double-sided welding to make the infiltrat...

Embodiment 2

[0078] (1) Sample and preparation of strong carbonitriding mixture

[0079] The workpiece material is annealed H11, H13, H21 hot mold steel, and the chemical composition of the three test materials is shown in Table 1. The size of the metallographic and hardness workpiece sample is Ф25×6mm, the size of the worn workpiece sample is Ф40×4mm, and the surface roughness of the workpiece sample is 0.8mm;

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

[0081] (3) Strong carburizing

[0082] Use 6mm thick 1Cr18Ni9Ti stainless steel plate double-sided welding to make infiltration box, put H11 hot mold steel workpiece, H13 hot mold steel workpiece and H21 hot mold steel workpiece, and carbonitriding strong infiltration...

Embodiment 3

[0088] (1) Sample and preparation of strong carbonitriding mixture

[0089] The workpiece material is annealed H11, H13, H21 hot mold steel, and the chemical composition of the three test materials is shown in Table 1. The size of the metallographic and hardness workpiece sample is Ф25×6mm, the size of the worn workpiece sample is Ф40×4mm, and the surface roughness of the workpiece sample is 0.8mm;

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

[0091] (3) Strong carburizing

[0092] Use 6mm thick 1Cr18Ni9Ti stainless steel plate double-sided welding to make infiltration box, put H11 hot mold steel workpiece, H13 hot mold steel workpiece and H21 hot mold steel workpiece, and carbonitriding strong infiltration a...

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Abstract

The invention provides a heat treatment process improving the hot hardness and the high temperature abrasion resisting performance of hot mold steel. Charcoal, urea particles, sodium carbonate powderand chromic anhydride are mixed to obtain a carbon-nitrogen strong permeating mixture; a hot mold steel workpiece and the carbon-nitrogen strong permeating mixture are installed in a permeating box atthe same time, and a box cover of the permeating box is sealed; the permeating box is placed into a crucible type electric furnace to be subjected to constant temperature carbon-nitrogen strong permeating at 850-950 DEG C; after quenching treatment, the hot mold steel workpiece is directly immersed into quenching oil to be cooled; and after air cooling, placing into a box type intermediate temperature tempering furnace for tempering twice is performed, and the hot mold steel workpiece high in hot hardness and high in high temperature abrasion resisting performance is obtained. The heat treatment process has the advantages of being easy and convenient to operate, low in cost and obvious in effect, the surface hardness of the obtained hot mold steel can reach 62 HRC or above, the high temperature abrasion resisting performance under the temperature of 600 DEG C exceeds that of a same hot mold steel conventional heat treatment piece twice or above, and the service life of a hot working mold can be effectively prolonged.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(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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