Method for improving corrosion resistance of nitrogen-containing duplex stainless steel

A duplex stainless steel and corrosion-resistant technology, which is applied in the field of improving the corrosion resistance of nitrogen-containing duplex stainless steel, can solve the problems of high economic cost and complicated control process, and achieve the effect of reducing sulfur content and good desulfurization ability
CN113234894AActive Publication Date: 2021-08-10NORTHEASTERN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHEASTERN UNIV
Publication Date
2021-08-10

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Abstract

The invention belongs to the technical field of nitrogen-containing duplex stainless steel production, and provides a method for improving the corrosion resistance of nitrogen-containing duplex stainless steel. A trace amount of niobium is added into nitrogen-containing stainless steel, niobium-containing Z-phase wrapping inclusions are easy to precipitate, and the corrosion resistance of the duplex stainless steel is improved. By optimizing the refining process, the inclusions are fine and dispersed and are easily wrapped by the niobium-containing phase; in the casting process, the cooling strength is controlled to be the lowest cooling strength in the casting process in the area corresponding to the temperature interval where the niobium-containing phase is precipitated, precipitation of the niobium-containing phase with the inclusion as the core is promoted, and the proportion of the inclusion wrapped by the niobium-containing phase is increased; then the cooling strength is improved, and excessive growth of niobium-containing phases and precipitation of harmful phases are avoided; and according to the method provided by the invention, the corrosion problem caused by inclusions can be effectively avoided, and a good guarantee is provided for long-life and stable service of the material in a typical environment.
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Description

technical field

[0001] The invention relates to the technical field of nitrogen-containing duplex stainless steel production, in particular to a method for improving the corrosion resistance of nitrogen-containing duplex stainless steel. Background technique

[0002] Nitrogen-containing duplex stainless steel is a type of stainless steel with a two-phase structure of ferrite and austenite and an equal proportion of the two phases. It has both excellent corrosion resistance and good comprehensive mechanical properties. It is widely used in desalination and other fields. In recent years, with the increasingly harsh service environment, higher requirements have been put forward for the corrosion resistance of nitrogen-containing duplex stainless steel. Therefore, it is very important to develop methods to effectively improve the corrosion resistance of nitrogen-containing duplex stainless steel to ensure the long life and stable service of this type of material.

[0003] Incl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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