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US 10,378,072 B2Granted
Maraging steel
AssigneeDaido Steel Co., Ltd.
InventorsKeita Hinoshita, Kenji Sugiyama, Hiroyuki Takabayashi, Shigeki Ueta
Life of this patent
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Abstract
The present invention relates to a maraging steel containing, in terms of mass %, 0.10≤C≤0.35, 9.0≤Co≤20.0, 1.0≤(Mo+W/2)≤2.0, 1.0≤Cr≤4.0, a certain amount of Ni, a certain amount of Al, and V+Nb≤0.60, with the balance being Fe and inevitable impurities, in which in a case of V+Nb≤0.020, the amount of Ni is 6.0≤Ni≤9.4 and the amount of Al is 1.4≤Al≤2.0, and in a case of 0.020<V+Nb≤0.60, the amount of Ni is 6.0≤Ni≤20.0 and the amount of Al is 0.50≤Al≤2.0.
Claims20
A maraging steel consisting of:
- as essential components,
- 0.10 mass %≤C≤0.35 mass %,
- 9.0 mass %≤Co≤20.0 mass %,
- 1.0 mass %≤(Mo+W/2)≤2.0 mass %,
- 1.0 mass %≤Cr≤2.6 mass %,
- 6.0 mass %≤Ni≤20.0 mass %,
- 0.50 mass %≤Al≤2.0 mass %, and
- 0.020 mass %<V+Nb≤0.60 mass %, and
- as optional components,
- Ti≤0.10 mass %,
- S≤0.0010 mass %,
- N≤0,0020 mass %,
- B≤0.0050 mass %, and
- Si≤1.0 mass %,
- with a balance being Fe and inevitable impurities,
- wherein a number of AlN inclusion having a minor axe of 1.0 μm or smaller and an aspect ratio of 10 or larger is 0 per 100 mm2 when observed under Scanning Electron Microscope (SEM), and
- wherein a following relational expression is satisfied:
- Parameter X≥13.2,
- wherein X=5.5[C]+11.6[Si]−1.4[Ni]−5[Cr]−1.2[Mo]+0.7[Co]+41.9[Al]−7[V]−98.4[Nb]+3.3[B], and
- each element symbol with braces represents a content (by mass %) of each element.
17 more elements
A maraging steel consisting of:
- as essential components,
- 0.10 mass %≤C≤0.35 mass %,
- 9.0 mass %≤Co≤20.0 mass %,
- 1.0 mass %≤(Mo+W/2)≤2.0 mass %,
- 1.0 mass %≤Cr≤2.6 mass %,
- 6.0 mass %≤Ni≤9.4 mass %, and
- 1.45 mass %≤Al≤2.0 mass %, and
- as optional components,
- Ti≤0.10 mass %,
- S≤0.0010 mass %,
- N≤0.0020 mass %,
- V+Nb≤0.020 mass %,
- B≤0.0050 mass %, and
- Si≤1.0 mass %,
- with a balance being Fe and inevitable impurities,
- wherein a number of AlN inclusion having a minor axe of 1.0 μm or smaller and an aspect ratio of 10 or larger is 2 or less per 100 mm2 when observed under Scanning Electron Microscope (SEM).
13 more elements
Dependencies are inferred from the claim text.