Method for improving intergranular corrosion resistance capacity of austenitic stainless steel

A technology of austenitic stainless steel and intergranular corrosion, which is applied in the field of improving the resistance of austenitic stainless steel to intergranular corrosion, and can solve the problem of limited application range of austenitic stainless steel, high smelting cost, and reducing carbon content of austenitic stainless steel, etc. problem, to improve the resistance to intergranular corrosion, avoid grain growth, and achieve the effect of good resistance to intergranular corrosion
CN110195152AInactive Publication Date: 2019-09-03HENAN SHENZHOU PRECISION MFG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENAN SHENZHOU PRECISION MFG CO LTD
Publication Date
2019-09-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for improving the intergranular corrosion resistance capacity of austenitic stainless steel. The method comprises the following steps that sensitization treatment is carried out, specifically, heating treatment and sensitization treatment are carried out on the austenitic stainless steel, so that chromium carbide is separated out between crystal particles, and the sensitized stainless steel is obtained; the sensitized stainless steel is continuously heated to 880 DEG C-950 DEG C through atomic diffusion treatment, and the stainless steel is subjected to heat preservation; and then the stainless steel is cooled to the room temperature. According to the method, the chromium carbide is separated out between the crystal particles of the austenitic stainless steel through sensitization treatment firstly, so that the content of chromium between the crystal particles is low; then chromium atoms in the austenitic stainless steel crystal particles are diffused tothe crystal boundary through atomic diffusion treatment, so that the intergranular barren chromium phenomenon is eliminated, and the intergranular corrosion resistance is achieved in a stable state;and the method has the advantages that the heating temperature is low, the fuel consumption is low, the thermal forming process does not need to avoid a sensitization region, the equipment requirementis low, normalizing treatment can be carried out with a carbon steel material at the same time, the cost is low, and chemical components of an austenitic stainless steel material do not need to be changed.
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Description

technical field

[0001] The invention relates to a processing method for stainless steel materials, in particular to a method for improving the intergranular corrosion resistance of austenitic stainless steel. Background technique

[0002] Austenitic stainless steel refers to stainless steel with austenitic structure at room temperature. When the steel contains about 18% of Cr, 8% to 25% of Ni, and about 0.1% of C, it has a stable austenite structure. Austenitic stainless steel has high corrosion resistance, mainly due to the addition of Cr and Ni. The added Cr and Ni react with oxygen in the air to form a dense oxide film on the surface. This oxide film has high stability in many corrosive media, thus preventing the steel itself from being corroded by corrosive media. But under certain conditions, it will also be corroded. Intergranular corrosion is one of the corrosion forms, which is a selective corrosion phenomenon that occurs near the grain boundaries. Although the s...

Claims

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