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Duplex stainless steel

一种双相不锈钢、选自的技术，应用在双相不锈钢领域，能够解决应力腐蚀裂纹、厚度减薄等问题，达到优异耐受性的效果

Active Publication Date: 2015-03-11
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pitting corrosion and crevice corrosion may locally cause the thickness reduction of the material caused by corrosion to form through holes, and then, during the occurrence of pitting corrosion and crevice corrosion, it is possible to develop stress corrosion cracks starting from them , which becomes an important question

Method used

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  • Duplex stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0068] Steel Nos. 1 to 25 having the chemical compositions shown in Table 1 were each melted in a 50 kg vacuum melting furnace, and the obtained steel ingots were heated at 1200° C., forged and hot rolled, and processed into raw materials with a thickness of 5 mm.

[0069]

[0070] Next, the obtained raw material was subjected to a solution heat treatment at 1070° C. for 5 minutes, and then machined to produce a test piece (diameter: 15 mm, thickness: 2 mm) for evaluating corrosion resistance.

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Abstract

This duplex stainless steel contains, in mass%, 0.005-0.03% of C, 0.05-1.0% of Si, 0.1-4.0% of Mn, 3-8% of Ni, 20-35% of Cr, 0.01-4.0% of Mo, 0.001-0.30% of Al, 0.05-0.60% of N, and one or more elements selected from among 2.0% or less of Re, 2.0% or less of Ga and 2.0% or less of Ge, with the balance made up of Fe and impurities.

Description

technical field [0001] The present invention relates to a duplex stainless steel, in particular to a duplex stainless steel having excellent localized corrosion resistance against pitting corrosion, crevice corrosion, and the like. [0002] this application claims priority based on patent application 2012-140365 for which it applied to Japan on June 22, 2012, The content is used here. Background technique [0003] Due to its excellent corrosion resistance, especially seawater resistance, duplex stainless steel is widely used as a material for marine structures such as heat exchanger tubes, oil well tubes for oil wells or gas wells, and line pipes. [0004] In a corrosive environment, the environment in which the above-mentioned marine structures are used, that is, an environment containing chloride ions such as a seawater environment, also needs to pay attention to localized corrosion such as pitting corrosion and crevice corrosion. Pitting corrosion and crevice corrosion m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/58C21D8/10
CPCC22C38/002C22C38/005C22C38/04C21D2211/005C21D8/10C21D2211/001C22C38/44C22C38/00C22C38/42C22C38/06C22C38/02C21D8/105C22C38/58C22C38/001
Inventor 相良雅之富尾亚希子
Owner NIPPON STEEL CORP
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