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US 10,119,186 B2Granted
Maraging steel excellent in fatigue characteristics
AssigneeDaido Steel Co., Ltd.
InventorsKenji Sugiyama, Shigeki Ueta
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Abstract
Provided is a maraging steel excellent in fatigue characteristics, including, in terms of % by mass: C: ≤0.015%, Ni: from 12.0 to 20.0%, Mo: from 3.0 to 6.0%, Co: from 5.0 to 13.0%, Al: from 0.01 to 0.3%, Ti: from 0.2 to 2.0%, O: ≤0.0020%, N: ≤0.0020%, and Zr: from 0.001 to 0.02%, with the balance being Fe and unavoidable impurities.
Claims6
A maraging steel, consisting of, in terms of % by mass:
- C:
- ≤0.015%,
- Ni:
- 12.0 to 20.0%,
- Mo:
- 3.0 to 6.0%,
- Co:
- 5.0 to 13.0%,
- Al:
- 0.01 to 0.3%,
- Ti:
- 0.2 to 2.0%,
- O:
- ≤0.0020%,
- N:
- 0.0005 to 0.0020%,
- Zr:
- from 0.001 to 0.02%, and optionally one or more of:
- B:
- from 0.0010 to 0.010%,
- Mg:
- ≤0.003%, and
- Ca:
- ≤0.003%
- with the balance being Fe and unavoidable impurities,
- wherein the maraging steel comprises at least one TiN or TiCN inclusion with ZrO2 present in a center part thereof.
23 more elements
A maraging steel consisting of, in terms of % by mass:
- C:
- ≤0.015%,
- Ni:
- 12.0 to 20.0%,
- Mo:
- 3.0 to 6.0%,
- Co:
- 5.0 to 13.0%,
- Al:
- 0.01 to 0.3%,
- Ti:
- 0.2 to 2.0%,
- O:
- ≤0.0020%,
- N:
- 0.0005 to 0.0020%,
- Zr:
- from 0.001 to 0.02%, and optionally one or more of:
- B:
- from 0.0010 to 0.010%,
- Mg:
- ≤0.003%, and
- Ca:
- ≤0.003%
- with the balance being Fe and unavoidable impurities,
- wherein the maraging steel comprises at least one TiN or TiCN inclusion with ZrO2 present in a center part thereof and
- the maraging steel has a fatigue characteristic, when tested according to the method of JIS Z 2273 (2010), of 107 repetitions or more.
24 more elements
Dependencies are inferred from the claim text.