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A Gas Soft Nitriding Process for Stainless Steel Parts

A soft nitriding and stainless steel technology, applied in the field of gas soft nitriding process, can solve the problems of difficult to achieve uniform, stable and qualified infiltration layer in large quantities, imperfect stainless steel soft nitriding process, and low number of single nitriding parts, etc. Good stabilization effect, low consumption of gas raw materials, and large effect of single furnace loading

Active Publication Date: 2018-07-10
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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  • A Gas Soft Nitriding Process for Stainless Steel Parts
  • A Gas Soft Nitriding Process for Stainless Steel Parts
  • A Gas Soft Nitriding Process for Stainless Steel Parts

Examples

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Embodiment 1

[0031] Embodiments of the present invention: Embodiment 1: A gas nitrocarburizing process of stainless steel parts, the gas nitrocarburizing process of 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, where the concentration of the cleaning agent is a 3% degreasing aqueous solution, and the degreasing temperature is 40°C;

[0033] 2) Pre-nitrogen pretreatment: soak the parts in the pre-treatment liquid, the temperature of the pre-treatment liquid during immersion is 30℃, and the time is 10 minutes, which can improve the gas-nitrogen catalytic permeability of the parts and increase the ease of the parts in the nitrocarburizing. Nitrogen and nitriding uniformity;

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

[0035] 4) Shielding gas filling: op...

Embodiment 2

[0045] Embodiment 2: A gas nitrocarburizing process of stainless steel parts, the gas nitrocarburizing process of 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, where the concentration of the cleaning agent solution is 8% degreasing water solution, and the degreasing temperature is 70°C;

[0047] 2) Nitrogen pretreatment: soak the parts in the pretreatment liquid, the temperature of the pretreatment liquid during immersion is 50℃, and the time is 40min, which can improve the gas nitrogen permeability of the parts and increase the ease of the parts during nitrocarburizing. Nitrogen and nitriding uniformity;

[0048] 3) Pre-vacuum: the product enters the furnace, the nitriding furnace is vacuumed after the furnace cover is sealed, and the vacuum degree is less than 35pa;

[0049] 4) Shielding gas filling: open the exhaust valve when filling the nitriding furnac...

Embodiment 3

[0058] Embodiment 3: A gas nitrocarburizing process of stainless steel parts, the gas nitrocarburizing process of 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, where the concentration of the cleaning agent is a 5% degreasing aqueous solution, and the degreasing temperature is 50°C;

[0060] 2) Pre-nitrogen pretreatment: soak the parts in the pre-treatment liquid, the temperature of the pre-treatment liquid during soaking is 40℃, and the time is 20min, which can improve the gas-nitrogen catalytic permeability of the parts and increase the ease of the parts in the nitrocarburizing. Nitrogen and nitriding uniformity;

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

[0062] 4) Shielding gas filling: Open the exhaust valve when filling the nit...

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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, enterprises have higher and higher requirements for precision parts products, requiring parts with 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 that involves nitriding and carbon infiltration, also known as soft nitriding. The main purpose is to improve the wear resistance and seizure resistance of steel. [0003] Existing technologies include Chinese patent publication numbers (CN1424510A, CN1616704A, CN102517541A), which are mainly divided into liquid method and gas method, namely salt bath nitrocarburizing and gas nitrocarburizing. In the...

Claims

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Application Information

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Patent Type & Authority Patents(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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