Nitrocarburizing process of Cr12MoV steel

A nitrocarburizing and process technology, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of short life, reduced mold dimensional accuracy, complex process, etc., and achieve surface hardness improvement and use The effect of prolonging the life and simplifying the process

Inactive Publication Date: 2014-06-18
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese Patent Publication No. CN101392361A discloses a martensitic stainless steel nitrocarburizing method, but there are also disadvantages such as unsatisfactory expected effect and short life; In the process of forming and flowing, there is strong friction on the surface of the mold, which will deteriorate the surface quality and even reduce the dimensional accuracy of the mold
However, in the existing Cr12MoV steel chemical heat treatment process, professional special equipment is required, the process is complicated, and ordinary enterprises, especially small enterprises, do not have the processing conditions

Method used

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  • Nitrocarburizing process of Cr12MoV steel
  • Nitrocarburizing process of Cr12MoV steel
  • Nitrocarburizing process of Cr12MoV steel

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Three Cr12MoV steel molds were subjected to high-temperature quenching with secondary heating at 850°C±5°C for 0.5h; oil quenching at 1150°C±5°C for 0.1h. Take 1800g solid carburizing agent, 1200g urea and 40g chromium trioxide and mix evenly. Then spread a layer of penetrating agent on the bottom of the box, remove oil stains and rust on the surface of the mold, and put them into the box in turn. The thickness of the penetration agent between the mold and the box wall and between the mold and the mold is not less than 10 mm, and the uppermost layer is covered with a thickness of more than 20 mm, and then the penetration agent in the whole box is vibrated and then covered. The gaps between are sealed with wet refractory clay. Then put the seepage box into the electric furnace that has been heated to 570°C and keep it warm for 8 hours. After the holding time, pull the seepage box out of the furnace, open the cover, take out the mold one by one and carry out oil cooling ...

Embodiment 2

[0029] Three stepped Cr12MoV steel molds were subjected to high-temperature quenching with secondary heating at 850°C±5°C for 0.5h; oil quenching at 1150°C±5°C for 0.2h. Take 3000g solid carburizing agent, 2000g urea and 120g chromium trioxide and mix evenly. Then spread a layer of penetrating agent on the bottom of the box, remove oil stains and rust on the surface of the mold, and put them into the box in turn. The thickness of the penetration agent between the mold and the box wall and between the mold and the mold is not less than 10 mm, and the uppermost layer is covered with a thickness of more than 20 mm, and then the penetration agent in the whole box is vibrated and then covered. The gaps between are sealed with wet refractory clay. Then put the infiltration box into an electric furnace heated to 580°C and keep it warm for 7 hours. After the holding time, pull the infiltration box out of the furnace, open the cover, take out the mold one by one and carry out oil cool...

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Abstract

The invention relates to a nitrocarburizing process of Cr12MoV steel. The nitrocarburizing process comprises the following steps: carrying out high-temperature quenching on a mold of the Cr12MoV steel, putting the mold into a box, putting the box into an electric furnace, carrying out nitrocarburizing, maintaining the temperature for 4-8 hours, and adding a small amount of catalyst, namely chromium trioxide to carry out catalysis nitriding, wherein the process temperature of the nitrocarburizing is 560-580 DEG C, nitriding agents are charcoal and urea, and the proportion of the charcoal to the urea is 3:2; and putting the mold into the electric furnace at 200 DEG C, tempering for 2 hours while maintaining the temperature, discharging the mold out of the electric furnace, adding the mold into cold oil, and taking out the mold after the mold is cooled to the room temperature. According to the nitrocarburizing process, the service life of the mold of the Cr12MoV steel is effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of iron and steel materials, and in particular provides a simple, efficient and low-cost Cr12MoV steel nitrocarburizing process. technical background [0002] Cr12MoV steel is a commonly used cold-work die steel with good strength, toughness, wear resistance and high hardenability. It is suitable for making various cold deformation processing dies. It has been widely used in automobile manufacturing, powder metallurgy processing, etc. industry. Chinese Patent Publication No. CN101392361A discloses a martensitic stainless steel nitrocarburizing method, but there are also disadvantages such as unsatisfactory expected effect and short life; In the process of forming and flowing, there is strong friction on the surface of the mold, which will deteriorate the surface quality and even reduce the dimensional accuracy of the mold. Therefore, Cr12MoV steel molds generally have shortcomings ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C8/76
Inventor 齐锦刚王冰谷志刚苏泉涌赵作福张志刚张越
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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