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US 2015/0020926 A1Published application
Steel for nitrocarburizing and nitrocarburized component using the steel as material
AssigneesJfe Bars & Shapes Corporation, Jfe Steel Corporation
InventorsTakashi Iwamoto, Keisuke Ando, Kunikazu Tomita, Yasuhiro Omori, Kiyoshi Uwai, Shinji Mitao
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Abstract
According to the present invention, it is possible to obtain steel for nitrocarburizing having a predetermined chemical composition, a bainite area ratio exceeding 50% and excellent machinability by cutting before nitrocarburizing, and having strength and toughness equivalent to conventional steel, such as SCr420 carburized steel material, and excellent fatigue properties after nitrocarburizing.
Claims5
-3. (canceled)
A steel for nitrocarburizing comprising, in mass %,
- C:
- 0.01% or more and less than 0.10%,
- Si:
- 1.0% or less,
- Mn:
- 0.5% to 3.0%,
- Cr:
- 0.30% to 3.0%,
- Mo:
- 0.005% to 0.4%,
- V:
- 0.02% to 0.5%,
- Nb:
- 0.003% to 0.15%,
- Al:
- 0.005% to 0.2%,
- S:
- 0.06% or less,
- P:
- 0.02% or less,
- B:
- 0.0003% to 0.01%, and
- the balance being Fe and incidental impurities, and
- including a microstructure with a bainite area ratio exceeding 50% before nitrocarburizing.
21 more elements
Dependencies are inferred from the claim text.