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Microbiological corrosion resisting duplex stainless steel

A duplex stainless steel, microorganism-resistant technology, applied in the field of duplex stainless steel, can solve the problems of affecting the marine ecological balance, unfriendly environment, poor durability, etc.

Inactive Publication Date: 2016-10-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

However, the fungicides used often have unfavorable factors such as being unfriendly to the environment, affecting the ecological balance of the ocean, and having poor persistence.

Method used

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  • Microbiological corrosion resisting duplex stainless steel
  • Microbiological corrosion resisting duplex stainless steel

Examples

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Embodiment Construction

[0014] Examples 1-3, Comparative Examples 1-9 The chemical composition of the duplex stainless steel is shown in Table 1.

[0015] Table 1 embodiment and comparative example duplex stainless steel alloy chemical composition (wt%)

[0016]

[0017] All the duplex stainless steels in the examples and comparative examples adopt the preferred heat treatment, and the specific heat treatment system is: heat preservation at 1050-1080° C. for 2 hours, air cooling, aging at 580-620° C. for 5 hours, and air cooling.

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Abstract

The invention discloses microbiological corrosion resisting duplex stainless steel and a heat treatment technology thereof. The duplex stainless steel is prepared from, by weight percent, not larger than 0.03% of C, not larger than 1.00% of Si, not larger than 2.00% of Mn, not larger than 0.01% of S, not larger than 0.02% of P, 21%-32% of Cr, 2.0%-5.0% of Mo, 2.0%-6.0% of Cu, 0.1%-0.3% of N, 4.0%-8.0% of Ni and the balance Fe. The content of impurity elements in an alloy meets the corresponding requirement in the national standard of the duplex stainless steel. The novel material of the duplex stainless steel has the unique function of restraining bacterial biofilm generation; the risk that microbiological corrosion happens when the duplex stainless steel is used in different use environments can be remarkably reduced; and the duplex stainless steel can be widely used in the ocean, petroleum and gas and other fields where the duplex stainless steel is greatly applied.

Description

technical field [0001] The invention relates to duplex stainless steel, and in particular provides a new microbial corrosion-resistant duplex stainless steel material, which has a unique function of inhibiting bacterial biofilm and can significantly reduce the risk of microbial corrosion of duplex stainless steel in different use environments. Background technique [0002] The so-called microbial corrosion (Microbiologically influenced corrosion, MIC) refers to the corrosion process of various materials used in the environment caused by the life activities of various microorganisms. Each year in the United States alone, $30-50 billion in economic losses are caused by microbial corrosion of materials. Among them, the corrosion caused by microorganisms accounts for about 20% of all metal and building material corrosion. In recent years, microbial corrosion has become a very difficult problem in industrial fields such as marine, oil and gas, and water treatment. Microbial cor...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/44C21D6/00
Inventor 徐大可杨春光夏进南黎杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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