20Cr2Ni4A steel carburizing and nitrocarburizing multiplex heat treatment process

A composite heat treatment, nitrocarburizing technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problem that the performance of 20Cr2Ni4A steel cannot be fully utilized, and it does not meet the requirements of energy saving and emission reduction, efficient production, and production cycle. Long and other problems, to achieve the effect of reducing energy consumption, excellent overall product performance, and short production cycle

Inactive Publication Date: 2011-04-20
JIANGSU AIRSHIP GEAR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still two major deficiencies in the above-mentioned process. One is that only carburizing treatment can not give full play to the performance of 20Cr2Ni4A steel; secondly, the process is heated multiple times, the produ

Method used

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Example Embodiment

[0025] The present invention is a kind of 20Cr2Ni4A steel carburizing and nitrocarburizing composite heat treatment process, and the specific technological process is carried out according to the following steps:

[0026] (1) First put the parts made of 20Cr2Ni4A steel into the carburizing furnace. The parts in this example are gears, which are carburized by gas. After the furnace is installed, the temperature is raised to 920°C±5°C. Carburize for 6 hours, then take it out of the furnace and air cool;

[0027] (2) Next, send the carburized gear into a heat treatment furnace with a furnace temperature of 590°C±10°C, undergo 5 hours of gas nitrocarburizing treatment, and then raise the temperature to 800°C±10°C with the furnace, and hold it for 3 hours After oil cooling and quenching;

[0028] (3) Finally, put the quenched gear into the furnace for low-temperature tempering treatment. The furnace temperature is 190°C±10°C, keep it warm for 3 hours, and then air-cool with the fu...

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Abstract

The invention discloses a 20Cr2Ni4A steel carburizing and nitrocarburizing multiplex heat treatment process, which comprises the following process flows of: putting components made of 20Cr2Ni4A steel into a carburizing furnace, carburizing at the temperature of between 900 and 930 DEG C for 4.5 to 6 hours, discharging and performing air cooling; performing heat treatment on the carburized components in a furnace at the temperature of between 560 and 600 DEG C, performing gaseous nitrocarburizing treatment for 3 to 5 hours, raising the temperature to between 780 and 840 DEG C together with the furnace, keeping the temperature for 2 to 4 hours, and performing oil quenching; and finally charging the quenched components in the furnace for low-temperature tempering at the temperature of between 160 and 200 DEG C, keeping the temperature for 3 to 4 hours, and performing air-cooling together with the furnace. Due to the carburizing and nitrocarburizing multiplex heat treatment, the hardness on the surfaces of the components is greatly improved, and the abrasion resistance, fatigue strength and corrosion resistance are enhanced. In addition, the component heating frequency is low, so the energy consumption is greatly reduced and the work efficiency is doubled.

Description

technical field [0001] The invention relates to a metal heat treatment process, in particular to a 20Cr2Ni4A steel carburizing and nitrocarburizing composite heat treatment process. Background technique [0002] 20Cr2Ni4A steel is a commonly used alloy surface hardening structural steel. This material has good strength and toughness. It is the main material for manufacturing important parts such as high-strength gears, shafts, spline shafts and piston pins. Parts made of 20Cr2Ni4A steel can significantly improve its surface hardness, wear resistance and fatigue limit after carburizing, while its core still maintains high strength and toughness. The existing 20Cr2Ni4A steel carburizing process is mainly carried out according to the five major processes of carburizing, normalizing, high temperature tempering, quenching and low temperature tempering. This process is a mature process and has been widely used in the production field. "Coal Technology" Volume 19, Issue 3, publish...

Claims

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Application Information

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IPC IPC(8): C23F17/00C23C8/34
Inventor 陆小兵周智慧
Owner JIANGSU AIRSHIP GEAR
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