STEEL FOR NITRIDING AND NITRIDED COMPONENT

WIPO Patent Application WO/2012/105405

A1

Steel for nitriding, which has a chemical composition that contains 0.07-0.14% of C, 0.10-0.30% of Si, 0.4-1.0% of Mn, 0.005-0.030% of S, 1.0-1.5% of Cr, 0.05% of less of Mo (including 0%), 0.010% or more but less than 0.10% of Al and 0.10-0.25% of V, and if necessary 0.30% of less of Cu and/or 0.25% or less of Ni, with the balance made up of Fe and impurities, while satisfying (0.61Mn + 1.11Cr + 0.35Mo + 0.47V ≤ 2.30). P, N, Ti and O in the impurities respectively satisfy P ≤ 0.030%, N ≤ 0.008%, Ti ≤ 0.005% and O ≤ 0.0030%. This steel for nitriding can be easily cut before nitriding, and is suitable for use as a material for a nitrided component such as a ring gear for automobiles. A nitrided component, which has the above-described chemical composition, a surface hardness HV of 650-900, a core hardness HV of 150 or more and an effective case depth of 0.15 mm or more, has excellent characteristics such as high bending fatigue strength and high surface fatigue strength after nitriding even in cases where the content of Mo that is an expensive element is limited to 0.05% by mass or less, while having small expansion due to nitriding.

IMATAKA HIDEKI (JP)
YUYA MASATO (JP)
GYOTOKU YUYA (JP)
KOBAYASHI ATSUSHI (JP)
MAEDA SUSUMU (JP)

PCT/JP2012/051650

August 09, 2012

January 26, 2012

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SUMITOMO METAL IND (JP)
HONDA MOTOR CO LTD (JP)
IMATAKA HIDEKI (JP)
YUYA MASATO (JP)
GYOTOKU YUYA (JP)
KOBAYASHI ATSUSHI (JP)
MAEDA SUSUMU (JP)

C22C38/28; C22C38/50; C23C8/26; C21D1/06; C21D9/32

JPH05171347A	1993-07-09
JPH0971841A	1997-03-18
JPH09279296A	1997-10-28
JP2009030134A	2009-02-12
JP2006193827A	2006-07-27

SUGIOKA, Kanji et al. (JP)
Sugioka Miki 2 (JP)

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