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Gas soft nitriding process for stainless steel part

A technology of nitrocarburization and stainless steel, which is applied in the field of gas nitrocarburization process, can solve the problems that it is difficult to achieve a uniform, stable and qualified permeation layer in large quantities, the stainless steel nitrocarburization process is not perfect, and the number of parts in a single nitriding is not high, reaching Good stabilization effect, low consumption of gas raw materials, and large amount of single furnace charging

Active Publication Date: 2016-10-12
XINAN TOOLS GUIZHOU PROV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The current gas soft nitriding process: For example, the Chinese invention patent application (publication number CN1424510A) adopts the method of removing the passivation film in the nitrogen in the furnace in the ammonium chloride aqueous solution. The ammonium chloride aqueous solution is highly corrosive, which is highly corrosive to equipment and products, and It is difficult to realize large-scale nitriding of 11Cr17 stainless steel to make the permeated layer uniform and stable.
Another example is the Chinese invention patent application (publication number CN102517541A) using carbon tetrachloride and citric acid methanol solution to remove passivation film in nitrogen in the furnace and adopting multi-temperature section non-isothermal nitriding. The total nitriding time exceeds 440min, the amount of ammonia gas used for nitriding is large, and the production cost is high, above 5 m³ / h, the number of single nitriding parts is not high and the efficiency is low, and the use of methanol is toxic and easy to cause environmental pollution, so the existing stainless steel Soft nitriding process is not perfect

Method used

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  • Gas soft nitriding process for stainless steel part
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  • Gas soft nitriding process for stainless steel part

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Embodiment 1

[0031] Embodiments of the present invention: Embodiment 1: a kind of gas nitrocarburization process of stainless steel parts, the gas nitrocarburization process of this stainless steel parts is carried out according to the following steps:

[0032] 1) Degreasing cleaning: Use a cleaning agent to remove oil stains on the surface of the parts. The concentration of the cleaning agent is a 3% degreasing aqueous solution, and the degreasing temperature is 40°C;

[0033] 2) Nitrogen pretreatment: Soak the parts in the pretreatment solution. The temperature of the pretreatment solution during soaking is 30°C and the time is 10 minutes. Nitriding and nitriding uniformity;

[0034] 3) Pre-vacuumize: the product enters the furnace, and the furnace cover is sealed to vacuumize the nitriding furnace, and the vacuum degree is less than 20pa;

[0035] 4) Protective gas filling: Fill the nitriding furnace with nitrogen to a positive pressure of 5 cm water column, open the exhaust valve, adj...

Embodiment 2

[0045] Embodiment 2: a kind of gas nitrocarburization process of stainless steel parts, the gas nitrocarburization process of this stainless steel parts is carried out according to the following steps:

[0046] 1) Degreasing cleaning: Use a cleaning agent to remove oil stains on the surface of the parts. The concentration of the cleaning agent is 8% degreasing aqueous solution, and the degreasing temperature is 70°C;

[0047] 2) Nitrogen pretreatment: Soak the parts in the pretreatment solution. The temperature of the pretreatment solution during soaking is 50°C and the time is 40min. Nitriding and nitriding uniformity;

[0048] 3) Pre-vacuumizing: the product is put into the furnace, and the furnace cover is sealed to vacuumize the nitriding furnace, and the vacuum degree is less than 35pa;

[0049] 4) Protective gas filling: fill the nitriding furnace with nitrogen to a positive pressure of 20 cm water column, open the exhaust valve, adjust the exhaust valve exhaust volume,...

Embodiment 3

[0058] Embodiment 3: a kind of gas nitrocarburizing process of stainless steel parts, the gas nitrocarburizing process of this stainless steel parts is carried out according to the following steps:

[0059] 1) Degreasing cleaning: Use a cleaning agent to remove oil stains on the surface of the parts. The concentration of the cleaning agent solution is 5% degreasing aqueous solution, and the degreasing temperature is 50°C;

[0060] 2) Nitrogen pretreatment: Soak the parts in the pretreatment solution. The temperature of the pretreatment solution during soaking is 40°C and the time is 20 minutes. Nitriding and nitriding uniformity;

[0061] 3) Pre-vacuumizing: the product enters the furnace, and after the furnace cover is sealed, the nitriding furnace is vacuumed, and the vacuum degree is less than 25pa;

[0062] 4) Protective gas filling: fill the nitriding furnace with nitrogen to a positive pressure of 15 cm water column, open the exhaust valve, adjust the discharge volume o...

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Abstract

The invention discloses a gas soft nitriding process for a stainless steel part. According to the gas soft nitriding process for the stainless steel part, a nitriding carburized layer of gas nitrocarburizing of the stainless steel part is uniform; the consumption of gas raw materials is low; the single charging quantity is large; the nitriding efficiency is high; the nitriding time is short; and meanwhile, the advantages that pollution to the environment is little, corrosion of the production process to equipment is little, and product quality performance is high are achieved.

Description

technical field [0001] The invention relates to a gas soft nitriding process for stainless steel parts, and belongs to the technical field of stainless steel nitrocarburizing treatment. Background technique [0002] With the development of the machinery industry, companies have higher and higher requirements for precision parts and components, requiring parts to have higher wear resistance, corrosion resistance, bite resistance, impact resistance and the pursuit of environmental protection, high efficiency, and Energy saving requirements. Nitrocarburizing is a chemical heat treatment process in which carbon is infiltrated mainly while nitriding is the main purpose. It is also called soft nitriding. The main purpose is to improve the wear resistance and seizure resistance of steel. [0003] The existing technologies include Chinese patent publication numbers (CN1424510A, CN1616704A, CN102517541A), which are mainly divided into liquid method and gas method, namely salt bath n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/02C23C8/26
CPCC23C8/02C23C8/26
Inventor 王国志唐登炜彭德银凌志鸿蓝华
Owner XINAN TOOLS GUIZHOU PROV
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