Ferritic stainless steel sheet with excellent pitting corrosion resistance and soft magnetic properties.

A cost-effective ferritic stainless steel sheet with enhanced pitting corrosion resistance and soft magnetic properties is achieved through controlled element inclusion and crystal orientation, addressing the limitations of existing technologies.

JP7879447B2Active Publication Date: 2026-06-24NIPPON STEEL CORPORATION
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Patent Information

Application Number
JP2022203141
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2022-03-11
Filing Date
2022-12-20
Publication Date
2026-06-24
Estimated Expiration
2042-12-20

AI Technical Summary

Technical Problem

Existing ferritic stainless steel sheets struggle to achieve both excellent pitting corrosion resistance and soft magnetic properties while maintaining cost-effectiveness, as adding Si in excess promotes carbonitride deposition, degrading these properties.

Method used

A ferritic stainless steel sheet with a specific chemical composition and controlled inclusion of elements, including Si, Cr, Mo, Nb, and Ti, along with optimized crystal orientation, to enhance pitting corrosion resistance and soft magnetic properties.

Benefits of technology

The solution provides a cost-effective ferritic stainless steel sheet with improved pitting corrosion resistance and soft magnetic properties by controlling precipitate size and crystal orientation, suppressing carbonitride formation, and maintaining domain wall movement.

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Abstract

To provide a ferritic stainless steel excellent in pitting-corrosion resistance and soft magnetic properties, with a Si content over 1.0 mass% to duly regulate a specific component contained in a steel as well as to control an inclusion present in the steel and to control a crystal orientation of a crystal grain in the steel.SOLUTION: A ferritic stainless steel sheet contains C, Si, Mn, P, S, O, Cr, Mo, N, Al, Nb, Ti, etc. The contents of the Cr, Si and Mo in the steel sheet and the contents of the Nb and Ti respectively satisfy prescribed conditional expressions, and a precipitate present in the steel sheet has an average size of 5.0 μm or less in an equivalent circle diameter. An area ratio A of the precipitate is 2.0% or less in a base material of the stainless steel sheet. The ferritic stainless steel sheet is excellent in pitting-corrosion resistance and soft magnetic properties.SELECTED DRAWING: None
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