EP0334968A1
Expired / Lapsed
EP
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Composite alloy steel powder and sintered alloy steel
Assignee: JFE Steel Corp
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Filing: 1988-09-30
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Granted: —
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Expires: 2008-09-30
Abstract
Abstract High-strength and high-toughness sintered alloy steel and composite alloy steel powder for use in production ofthe steel are disclosed. The steel contains as final product alloy components Ni, Mo and/or W and, if necessary, C with the content of Ni being 0.50 to 3.50 wt %, the content of Mo + 112W being 0.65 to 3.50 wt % and, if necessary, the content of C being 0.3 to 0.8 wt %, and the balance being Fe and unavoidable impurities, and has a density of at least 7.0 g/cm 3 and a tensile strength of at least 130 kgf/mm 2. The content of each of Ni and Mo + 112W in the alloy steel powder of a particle size of 45 µm or less are 2.0 to 4.2 times as much as the average content of the whole powder. This composition gives high-strength and high-toughness sintered alloy steel by powder metallurgy using a comparatively low alloy formulation and heat-treated sintered steel satisfying requirements for automobile parts, etc.
Inventors
- 👤 Shigeaki C/O Kawasaki Steel Corp. Takajo
- 👤 Osamu C/O Kawasaki Steel Corp. Furukimi
- 👤 Kuniaki C/O Kawasaki Steel Corp. Ogura
- 👤 Keiichi C/O Kawasaki Steel Corp. Maruta
- 👤 Teruyoshi C/O Kawasaki Steel Corp. Abe
- 👤 Ichio C/O Kawasaki Steel Corp. Sakurada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 21:13
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; C22C33/0207
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
96 words
A composite alloy steel powder for powder metallurgy composed of iron powder particles and powdery alloy components attached by diffusion to part of the surface of the iron powder particles, which comprises containing Ni and Mo as alloy components, said alloy being composed of 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo, and the remainder of Fe and inevitable impurities, with the content of Ni and the content of Mo in the steel powder of particle diameter smaller than 45 µm being in the range of 2.0-4.2 times the average content in the entire steel powder.
Claim 2
Dependent Claim
96 words
A composite alloy steel powder for powder metallurgy composed of iron powder particles and powdery alloy components attached by diffusion to part of the surface of the iron powder particles, which comprises containing Ni and Mo as alloy components, said alloy being composed of 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo, and the remainder of Fe and inevitable impurities, with the content of Ni and the content of Mo in the steel powder of particle diameter smaller than 45 µm being in the range of 2.0-4.2 times the average content in the entire steel powder.
Claim 3
Dependent Claim
62 words
A high-strength sintered alloy steel which comprises containing Ni and Mo as alloy components in the final product, said alloy being composed of 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo, and the remainder of Fe, C, and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after quenching and tempering.
Claim 4
Dependent Claim
62 words
A high-strength sintered alloy steel which comprises containing Ni and Mo as alloy components in the final product, said alloy being composed of 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo, and the remainder of Fe, C, and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after quenching and tempering.
Claim 5
Dependent Claim
68 words
A high-strength high-toughness sintered alloy steel which comprises containing C, Ni, and Mo as alloy components in the final product, said alloy being composed of 0.3-0.8 wt% of C, 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of M o, and the remainder of Fe and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after quenching and tempering.
Claim 6
Dependent Claim
68 words
A high-strength high-toughness sintered alloy steel which comprises containing C, Ni, and Mo as alloy components in the final product, said alloy being composed of 0.3-0.8 wt% of C, 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of M o, and the remainder of Fe and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after quenching and tempering.
Claim 7
Dependent Claim
74 words
A high-strength sintered alloy steel produced from the composite alloy steel powder defined in Claim 1, which comprises containing Ni and Mo as alloy components in the final product, said alloy being composed of 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo, and the remainder of Fe, C, and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after carburizing quenching and tempering.
Claim 8
Dependent Claim
81 words
A high-strength high-toughness sintered alloy steel produced from the composite alloy steel powder defined in Claim 1, which comprises containing C, N i, and Mo as. alloy components in the final product, said alloy being composed of 0.3-0.8 wt% of C, 0.50-3.50 wt % of Ni, 0.65-3.50 wt% of Mo, and the remainder of F e and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after quenching and tempering.
Claim 9
Dependent Claim
102 words
A composite alloy steel powder for powder metallurgy composed of iron powder particles and powdery alloy components attached by diffusion to part of the surface of the iron powder particles, which comprises containing Ni, Mo, and W as alloy components, said alloy being composed of 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo + W, and the remainder of Fe and inevitable impurities, with the content of Ni and the content of M o + W in the steel powder of particle diameter smaller than 45 pm being in the range of 2.0-4.2 times the average content in the entire steel powder.
Claim 10
Dependent Claim
102 words
A composite alloy steel powder for powder metallurgy composed of iron powder particles and powdery alloy components attached by diffusion to part of the surface of the iron powder particles, which comprises containing Ni, Mo, and W as alloy components, said alloy being composed of 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo + W, and the remainder of Fe and inevitable impurities, with the content of Ni and the content of M o + W in the steel powder of particle diameter smaller than 45 pm being in the range of 2.0-4.2 times the average content in the entire steel powder.
Claim 11
Dependent Claim
65 words
A high-strength sintered alloy steel which comprises containing Ni, Mo, and W as alloy components in the final product, said alloy being composed of 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo + W, and the remainder of Fe, C, and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm2 after carburizing quenching and tempering.
Claim 12
Dependent Claim
65 words
A high-strength sintered alloy steel which comprises containing Ni, Mo, and W as alloy components in the final product, said alloy being composed of 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo + W, and the remainder of Fe, C, and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm2 after carburizing quenching and tempering.
Claim 13
Dependent Claim
71 words
A high-strength high-toughness sintered alloy steel which comprises containing C, Ni, Mo, and W as alloy components in the final product, said alloy being composed of 0.3-0.8 wt% of C, 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo + W, and the remainder of Fe and inevitable impurities, and having a density higher than 7 . 0 g/cm 3 and a tensile strength higher than 130 kgf/mm2 after quenching and tempering.
Claim 14
Dependent Claim
71 words
A high-strength high-toughness sintered alloy steel which comprises containing C, Ni, Mo, and W as alloy components in the final product, said alloy being composed of 0.3-0.8 wt% of C, 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo + W, and the remainder of Fe and inevitable impurities, and having a density higher than 7 . 0 g/cm 3 and a tensile strength higher than 130 kgf/mm2 after quenching and tempering.
Claim 15
Dependent Claim
77 words
A high-strength sintered alloy steel produced from the composite alloy steel powder defined in Claim 6, which comprises containing Ni, Mo, and W as alloy components in the final product, said alloy being composed of 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo + W, and the remainder of Fe, C, and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after carburizing quenching and tempering.
Claim 16
Dependent Claim
81 words
A high-strength high-toughness sintered alloy steel produced from the composite alloy steel powder defined in Claim 6, which comprises containing C, Ni, Mo, and W as alloy components in the final product, said alloy being composed of 0.3-0.8 wt% of C, 0.50-3.50 wt% of Ni, 0.65-3.50 wt% of Mo + W, and the remainder of Fe and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after quenching and tempering.
Claim 17
Dependent Claim
96 words
A composite alloy steel powder for powder metallurgy composed of iron powder particles and powdery alloy components attached by diffusion to part of the surface of the iron powder particles, which comprises containing Ni and W as alloy components, said alloy being composed of 0.50-3.50 wt% of Ni, 1.30-7.00 wt% of W, and the remainder of Fe and inevitable impurities, with the content of Ni and the content of W in the steel powder of particle diameter smaller than 45 pm being in the range of 2.0-4.2 times the average content in the entire steel powder.
Claim 18
Dependent Claim
96 words
A composite alloy steel powder for powder metallurgy composed of iron powder particles and powdery alloy components attached by diffusion to part of the surface of the iron powder particles, which comprises containing Ni and W as alloy components, said alloy being composed of 0.50-3.50 wt% of Ni, 1.30-7.00 wt% of W, and the remainder of Fe and inevitable impurities, with the content of Ni and the content of W in the steel powder of particle diameter smaller than 45 pm being in the range of 2.0-4.2 times the average content in the entire steel powder.
Claim 19
Dependent Claim
63 words
A high-strength sintered alloy steel which comprises containing Ni and W as alloy components in the final product, said alloy being composed of 0.50-3.50 wt% of Ni, 1.30-7.00 wt% of W, and the remainder of Fe, C, and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after carburizing quenching and tempering.
Claim 20
Dependent Claim
63 words
A high-strength sintered alloy steel which comprises containing Ni and W as alloy components in the final product, said alloy being composed of 0.50-3.50 wt% of Ni, 1.30-7.00 wt% of W, and the remainder of Fe, C, and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after carburizing quenching and tempering.
Claim 21
Dependent Claim
67 words
A high-strength high-toughness sintered alloy steel which comprises containing C, Ni, and W as alloy components in the final product, said alloy being composed of 0.3-0.8 wt% of C, 0.50-3.50 wt% of Ni, 1.30-7.00 wt% of W, and the remainder of Fe, and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after quenching and tempering.
Claim 22
Dependent Claim
67 words
A high-strength high-toughness sintered alloy steel which comprises containing C, Ni, and W as alloy components in the final product, said alloy being composed of 0.3-0.8 wt% of C, 0.50-3.50 wt% of Ni, 1.30-7.00 wt% of W, and the remainder of Fe, and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after quenching and tempering.
Claim 23
Dependent Claim
74 words
A high-strength sintered alloy steel produced from the composite alloy steel powder defined in Claim 11, which comprises containing Ni and W as alloy components in the final product, said alloy being composed of 0.50-3.50 wt% of Ni, 1.30-7.00 wt% of W, and the remainder of Fe, C, and inevitable impurities, and having a density higher than 7.0 gjcm 3 and a tensile strength higher than 130 kgf/mm 2 after carburizing quenching and tempering.
Claim 24
Dependent Claim
78 words
A high-strength high-toughness sintered alloy steel produced from the composite alloy steel powder defined in Claim 11, which comprises containing Ni and W as the alloy components in the final product, said alloy being composed of 0.3-0.8 wt% of C, 0.50-3.50 wt% of Ni, 1.30-7.00 wt% of W, and the remainder of Fe and inevitable impurities, and having a density higher than 7.0 g/cm 3 and a tensile strength higher than 130 kgf/mm 2 after quenching and tempering.
References Cited (Backward Citations)
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