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Gas deep carburizing method for stainless steel

A stainless steel and carburizing technology, applied in the field of deep gas carburizing of stainless steel, can solve the problems of easy cracking, high austenitization temperature, high stress, etc., to avoid cracks, low carburizing temperature, and reduce thermal stress. Effect

Inactive Publication Date: 2014-10-15
GUIZHOU HONGLIN MACHINERY
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Problems solved by technology

In addition, 1Cr17Ni2 material has good hardenability, high austenitization temperature (980-1030 °C), and the stress generated during the cooling process after carburizing is relatively large, which is prone to cracks
Therefore, there are few domestic researches on the carburizing process of 1Cr17Ni2 materials.

Method used

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  • Gas deep carburizing method for stainless steel
  • Gas deep carburizing method for stainless steel
  • Gas deep carburizing method for stainless steel

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Embodiment 2

[0055] Embodiment 2 of the present invention. The gas deep layer carburizing method for stainless steel comprises the following steps,

[0056] a. Use 1Cr17Ni2 stainless steel to make parts, clean the parts, and then remove the passivation film on the surface of the parts;

[0057] b. Raise the temperature of the well type carburizing furnace to 880°C, add carburizing agent toluene and infiltrating agent ammonia, the supply rate of toluene is 30-40 drops / min, the supply rate of ammonia gas is 5-6.5 liters / min, and the supply time is 0.5 -1.5 hours;

[0058] c. Put the parts into the well-type carburizing furnace, only supply ammonia gas, and the ammonia gas supply rate is 7.5-8.5 liters / minute. When the temperature of the carburizing furnace reaches 880 ° C, carburizing is carried out:

[0059] The first stage: the furnace temperature is 880°C, the temperature is kept for 0.5-1 hour, and the supply of ammonia gas is 5-6.5 liters / minute;

[0060] The second stage: Furnace te...

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Abstract

A disclosed gas deep carburizing method for stainless steel is characterized by comprising: employing a 1Cr17Ni2 stainless steel material to make a part, cleaning the part, and removing a passive film; putting the part into a well-type carburizing furnace added with a carburizing agent toluene and a carburizing catalyst ammonia gas, performing carburizing processing by dividing into three stages, and after carburizing is finished, performing oil cooling on the part. The carburizing technology is low in carburizing temperature, the depth of a carburized layer reaches 0.75 mm or more, the surface of a carburized stainless steel part has no cracks, and the hardness of the carburized layer of the part subjected to quenching reaches 63 HRC or more.

Description

[0001] technical field [0002] The invention relates to a gas deep carburizing method for stainless steel, which belongs to the technical field of stainless steel carburizing technology. [0003] Background technique [0004] The carburizing process is widely used in steel materials. It is a chemical heat treatment method that infiltrates carbon atoms on the surface of steel materials to increase the carbon content of the surface layer of steel materials, thereby improving the surface hardness, wear resistance and fatigue strength of steel parts. This treatment The method is usually used in low carbon steel and low alloy steel parts. The 1Cr17Ni2 material belongs to martensitic stainless steel, which contains high chromium and nickel, and a dense passivation film is easily formed on the surface of the part, and the chromium and carbon are strongly combined during the carburizing process, which slows down the carbon in the austria. Diffusion of celite, and if the depth of ...

Claims

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Application Information

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IPC IPC(8): C23C8/22
Inventor 李念平
Owner GUIZHOU HONGLIN MACHINERY
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