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US 2003/0192626 A1Published application
Precipitation-hardened soft magnetic ferritic stainless steels
AssigneeTohoku Steel Co., Ltd.
InventorsTsunemi Takiguchi, Takashi Ebata
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AssigneeTohoku Steel Co., Ltd.
InventorsTsunemi Takiguchi, Takashi Ebata
Estimating the term…
A precipitation-hardened soft magnetic ferritic stainless steel comprises C: not more than 0.2 mass %, Si: 0.01-3.0 mass %, Mn: not more than 0.5 mass %, S: not more than 0.3 mass %, Cr: 12.0-19.0 mass %, Ni: 1.0-4.0 mass % and Al: 0.2-4.0 mass % and further contains at least one of Ti: less than 0.5 mass % and Zr: less than 0.3 mass % and the remainder being inevitable impurities and Fe, and has substantially a microstructure of a ferrite phase after a solution treatment and an aging treatment.
A precipitation-hardened soft magnetic feiritic stainless steel characterized by comprising C:
A precipitation-hardened soft magnetic ferritic stainless steel characterized by comprising C:
Dependencies are inferred from the claim text.
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Containing chromium: with more than 1.5% by weight of silicon
Ferrous alloys, e.g. steel alloys: containing aluminium
With nickel: with titanium or zirconium
Ferrous alloys, e.g. steel alloys: containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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1. Field of the Invention
This invention relates to a precipitation-hardened soft magnetic ferritic stainless steel, and more particularly to a precipitation-hardened soft magnetic ferritic stainless steel having not only excellent magnetic properties and corrosion resistance but also a high hardness, which contributes to an improvement of a durability such as a wear resistance, a resistance to a buckling and the like in a movable part of a magnetic circuit apparatus, and a good cold workability. Especially, it is preferable to use such a ferritic stainless steel as a magnetic core material for various electromagnetic valves, an electronic control fuel injection device and others.
2. Description of Related Art
In the invention, the reason of limiting the chemical composition in the steel to the above range will be explained below. Moreover, mass % in the chemical composition of the steel represents simply as “%”.
C: not more than 0.2%
C is an austenite stabilizing element obstructing the formation of steel microstructure based on the ferrite phase and also adversely affecting the magnetic properties. To this end, the C content is desirable to be decreased as far as possible and is limited to not more than 0.2% in view of the fixation as a carbide or a carbosulfide by Ti, Zr and Nb and the productivity.