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Steel material for structural member having excellent corrosion resistance

A technology for structural components and corrosion resistance, applied in the field of steel for structural components, can solve problems such as insufficient corrosion resistance and achieve excellent corrosion resistance

Inactive Publication Date: 2012-07-25
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the actual situation is that none of the above technologies can be said to have sufficient corrosion resistance under severe corrosion environments.

Method used

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  • Steel material for structural member having excellent corrosion resistance
  • Steel material for structural member having excellent corrosion resistance
  • Steel material for structural member having excellent corrosion resistance

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Experimental program
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Embodiment Construction

[0017] The inventors of the present invention have made intensive studies in order to solve the aforementioned problems. As a result, it was found that if elements such as C, Si, Mn, P, S, Al, Cu, Ni, Cr, Ti, Ca are strictly adjusted, and the following A value obtained from the composition [(1) formula] is controlled In the range of -2.0 or more and 2.0 or less, steel materials for structural members excellent in corrosion resistance can be obtained, and the present invention has been completed.

[0018] A value = {([S] / 3)+([P] / 8)-([Mn] / 890)-([Ti] / 630)-([Ca] / 130)-([Cu] / 710 )-([Ni] / 712)-([Cr] / 330)}×10 3 …(1)

[0019] Among them, [S], [P], [Mn], [Ti], [Ca], [Cu], [Ni] and [Cr] represent S, P, Mn, Ti, Ca, Cu, Ni and Cr, respectively content (mass%).

[0020] The above-mentioned A value is a parameter showing a uniform and stable surface scale film, and is an index showing long-term corrosion resistance even in a severe corrosion environment. The coefficients corresponding to...

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Abstract

The subject of the invention is to provide a steel material for a structural member which has excellent long term corrosion resistance even anticorrosive means such as coating or lining anticorrosion is not taken under severe corrosive environments. The steel material for a structural member satisfies specified chemical compositions and A value is between -2.0 and 2.0 as prescribed by a following forum (1). A value={([S] / 3)+([P] / 8)-([Mn] / 890)-([Ti] / 630)-([Ca] / 130)-([Cu] / 710)-([Ni] / 712)-([Cr] / 330)*103}...in(1), [S],[P],[Mn],[Ti],[Ca],[Cu],[Ni] and [Cr] respectively represent the contents (weight%) of S,P,Mn,Ti,Ca,Cu,Ni and Cr.

Description

technical field [0001] The present invention relates to steel materials for structural members that are useful as structural members of marine structures such as bridges, in addition to ships such as crude oil storage tanks, cargo ships, passenger ships, and warships, and particularly relate to exhibiting excellent corrosion resistance in severe corrosive environments Steel for structural members. In addition, the steel materials for structural members of the present invention can be applied as structural members of marine structures such as bridges in addition to various ships. Case. Background technique [0002] Steel materials used as main structural members in various ships are exposed to severe corrosive environments due to corrosive gas components, etc. in addition to salt from seawater, high temperature and high humidity, and moisture contained in crude oil. In particular, in the oil tank of the crude oil storage tank (crude oil storage tank), in addition to the vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/52C22C38/50
CPCC22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C22C38/52
Inventor 小泽敬祐阪下真司吉田诚司
Owner KOBE STEEL LTD