Patent
Method of manufacturing maraging steel strip having high fatigue strength
TLDR
In this article, a method of manufacturing a maraging steel strip having high fatigue strength equal to or higher than that of a steel strip containing Ti by optimizing a chemical component and nitriding treatment was proposed.Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a maraging steel strip having high fatigue strength equal to or higher than that of maraging steel containing Ti by optimizing a chemical component and nitriding treatment, in the maraging steel in which Ti contained as a strengthening element is reduced. SOLUTION: In this method of manufacturing for the maraging steel strip having high fatigue strength, the maraging steel strip containing, by mass, 17.0 to 22.0% Ni, 0.1 to 4.0% Cr, 3.0 to 7.0% Mo, >7.0% and ≤20.0% Co, ≤0.1% Ti, and ≤0.01% (not including 0%) B is used as raw material, and after the raw material is heated and retained under a gaseous atmosphere containing a fluorine compound to thereby remove an oxidized film formed on the surface of the raw material, the nitriding treatment is performed in a nitriding gas in which a value of a gas composition ratio of NH 3 /H 2 is adjusted to 1 to 3 under 400 to 500°C. COPYRIGHT: (C)2008,JPO&INPITread more
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Patent
Maraging steel strip
TL;DR: In this paper, a maraging steel strip produced by nitriding a managing steel which contains by mass, C: 0.01% or less, Si: 0, 1.1%, 0.5%, 0, 0.03%, and 0.005%, with the balance being Fe and unavoidable impurities, wherein Baker-nutting orientation relationship with an orientation difference within 10° exists between the Cr nitride precipitated in the nitrided layer and the matrix martensite.
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References
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Nitriding method for maraging steel and maraging steel product obtained thereby
TL;DR: In this paper, the problem of obtaining steel having high fatigue strength and wear resistance by previously forming a fluoride film by reaction gas contg. fluorine on the surface of steel and thereafter forming a hard nitrided hardened layer in a nitriding atmosphere in which the concn. of NH3 and temp.
Patent
Gas nitriding method for maraging steel
Toru Yagasaki,徹 矢ケ崎 +1 more
TL;DR: In this article, a thin sheet in which a fluoride layer has been formed on the surface after solution heat treatment and aging treatment to nitriding treatment in gas which contains gaseous ammonia and does not contain carbon or contains it by a trace amt.
Patent
Manufacturing method of layered ring
TL;DR: In this paper, a manufacturing method of layered rings capable of obtaining the rings having the excellent surface hardness at a low cost was proposed, where ends of a maraging steel thin plate 1 are welded to each other, and an obtained cylindrical drum 2 is cut to a predetermined width to form rings 4.
Patent
Steel for thin strip, and thin strip
TL;DR: In this paper, the authors proposed an alloy composition for a thin strip, which keeps such a feature of a maraging steel as high strength and high toughness, and simultaneously shows more excellent fatigue strength properties than known steel.