US3658516A
Expired / Lapsed
US
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Austenitic cast steel of high strength and excellent ductility at high temperatures
Assignee: Hitachi Ltd
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Filing: 1969-09-05
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Granted: 1972-04-25
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Expires: 1989-09-05
Abstract
Abstract An austenitic cast steel having high strength and excellent ductility at temperatures higher than, for example, 700* C. consisting essentially of C in the range from 0.30 to 0.55 percent, Si in the range from 0.2 to 2.0 percent, Mn in the range from 0.5 to 3.0 percent, Ni in the range from 15 to 40 percent, Cr in the range from 20 to 30 percent, Ti in the range from 0.05 to 0.6 percent, a rare earth metal alloy containing Ce and La as the main components in the range from 0.05 to 0.5 percent (as the additive amount) and the balance substantially iron. The steel may further contain from 0.07 to 0.7 percent by weight of Nb.
Inventors
- 👤 Mikio Hachisu
- 👤 Eisuke Nilyama
- 👤 Ryoichi Sasaki
- 👤 Humio Hataya
- 👤 Yutaka Fukui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:58
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/58; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3053; B23K35/308; B23K35/3086; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/055; C22C38/50
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
129 words
An austenitic heat-resisting cast steel consisting essentially of C in the range from 0.35 to 0.48 percent, Si in the range from 0.5 to 1.2 percent, Mn in the range from 0.7 to 2.0 percent, Ni in the range from 18 to 38 percent, Cr in the range from 23 to 28 percent, Ti in the range from 0.15 to 0.35 percent, a rare earth metal alloy containing Ce and La as the main components added in the range from 0.20 to 0.45 percent and the balance substantially iron, the cast steel containing not more than 50 p.p.m. of oxygen and 400 p.p.m. of nitrogen, respectively, the percents all being by weight, said cast steel possessing high creep rupture strength and excellent ductility at temperatures higher than 700* C.
Claim 2
Dependent Claim
147 words
An austenitic heat-resisting cast steel consisting essentially of C in the range from 0.30 to 0.55 percent, Si in the range from 0.2 to 2.0 percent, Mn in the range from 0.5 to 3.0 percent, Ni in the range from 15 to 40 percent, Cr in the range from 20 to 30 percent, Ti in the range from 0.05 to 0.6 percent, a rare earth metal alloy containing Ce and La as the main components added in the range from 0.05 to 0.5 percent and the balance substantially iron, the cast steel containing not more than 50 p.p.m. of oXygen and 400 p.p.m. of nitrogen, respectively, the percents all being by weight, said cast steel possessing tensile strength greater than 7 kg./mm.2, an elongation larger than about 23 percent and a reduction of area larger than about 35 percent at temperatures ranging between 850* and 1,000* C.
Claim 3
Dependent Claim
105 words
An austenitic heat-resisting cast steel consisting essentially of C in the range from 0.30 to 0.55 percent, Si in the range from 0.2 to 2.0 percent, Mn in the range from 0.5 to 3.0 percent, Ni in the range from 15 to 40 percent, Cr in the range from 20 to 30 percent, Ti in the range from 0.05 to 0.6 percent, Misch metal containing Ce and La as the main components added in the range from 0.05 to 0.5 percent and the balance substantially iron, the percents all being by weight, said cast steel possessing excellent ductility at temperatures higher than about 700* C.
Claim 4
Dependent Claim
39 words
The austenitic cast steel of claim 4, wherein the Misch metal has composition of 52 percent by weight of Ce, 24 percent by weight of La, 18 percent by weight of Nd, and 5 percent by weight of Pr.
Claim 5
Dependent Claim
127 words
An austenitic heat-resisting cast steel consisting essentially of C in the range from 0.35 to 0.48 percent, Si in the range from 0.5 to 1.2 percent, Mn in the range from 0.7 to 2.0 percent, Ni in the range from 18 to 38 percent, Cr in the range from 23 to 28 percent, Ti in the range from 0.15 to 0.35 percent, Misch metal containing Ce and La as the main components added in the range from 0.20 to 45 percent and the balance substantially iron, the cast steel containing not more than 50 p.p.m. of oxygen and 400 p.p.m. of nitrogen, respectively the percents all being by weight, said cast steel possessing high creep rupture strength and excellent ductility at temperatures higher than about 700* C.
Claim 6
Dependent Claim
39 words
The austenitic cast steel of claim 6, wherein the Misch metal has composition of 52 percent by weight of Ce, 24 percent by weight of La, 18 percent by weight of Nd, and 5 percent by weight of Pr.
Claim 7
Dependent Claim
132 words
An austenitic heat-resisting cast steel of high creep rupture strength and excellent ductility at temperatures higher than about 850* C. for use in chemical apparatus consisting essentially of C in the range from 0.30 to 0.55 percent, Si in the range from 0.2 to 2.0 percent, Mn in the range from 0.5 to 3.0 percent, Ni in the range from 18 to 38 percent, Cr in the range from 23 to 28 percent, Ti in the range from 0.05 to 0.6 percent, a rare earth metal alloy containing Ce and La as the main components added in the range from 0.20 to 0.45 percent and the balance substantially iron, the cast steel containing not more than 50 p.p.m. of oxygen and 400 p.p.m. of nitrogen, respectively, the percents all being by weight.
Claim 8
Dependent Claim
113 words
A welding wire comprised of an austenitic heat-resisting steel material consisting essentially of C in the range from 0.30 to 0.55 percent, Si in the range from 0.2 to 2.0 percent, Mn in the range from 0.5 to 3.0 percent, Ni in the range from 15 to 40 percent, Cr in the range from 20 to 30 percent, Ti in the range from 0.05 to 0.6 percent, a rare earth metal alloy containing Ce and La as the main components added in the range from 0.05 to 0.5 percent and the balance substantially iron, the amount of oxygen contained in the steel being less than 50 p.p.m., the percents all being by weight.
Claim 9
Dependent Claim
124 words
An austenitic heat-resisting cast steel consisting essentially of C in the range from 0.30 to 0.55 percent, Si in the raNge from 0.2 to 2.0 percent, Mn in the range from 0.5 to 3.0 percent, Ni in the range from 15 to 40 percent, Cr in the range from 20 to 30 percent, Ti in the range from 0.05 to 0.6 percent, a rare earth metal alloy containing Ce and La as the main components added in the range from 0.05 to 0.5 percent, Nb in the range from 0.07 to 0.7 percent, and the balance substantially iron, the percents all being by weight, said cast steel being substantially free from gaseous impurities and possessing excellent ductility at temperatures higher than about 700* C.
Claim 10
Dependent Claim
129 words
An austenitic heat-resisting cast steel consisting essentially of C in the range from 0.30 to 0.55 percent, Si in the range from 0.2 to 2.0 percent, Mn in the range from 0.5 to 3.0 percent, Ni in the range from 15 to 40 percent, Cr in the range from 20 to 30 percent, Ti in the range from 0.05 to 0.6 percent, a rare earth metal alloy containing Ce and La as the main components added in the range from 0.05 to 0.5 percent and the balance substantially iron, wherein an amount of oxygen contained in the steel is not greater than 50 p.p.m. and an amount of nitrogen contained is not greater than 1,000 p.p.m., said cast steel possessing excellent ductility at temperatures higher than about 700* C.
Claim 11
Dependent Claim
139 words
An austenitic heat-resisting cast steel consisting essentially of C in the range from 0.35 to 0.48 percent, Si in the range from 0.5 to 1.2 percent, Mn in the range from 0.7 to 2.0 percent, Ni in the range from 18 to 38 percent, Cr in the range from 23 to 28 percent, Ti in the range from 0.15 to 0.35 percent, a rare earth metal alloy containing Ce and La as the main components added in the range from 0.20 to 0.45 percent, Nb in the range from 0.1 to 0.4 percent and the balance substantially iron, the cast steel containing not more than 50 p.p.m. of oxygen and 400 p.p.m. of nitrogen, respectively, the percents all being by weight, said cast steel possessing high creep rupture strength and excellent ductility at temperatures higher than about 700* C.
Claim 12
Dependent Claim
156 words
An austenitic heat-resisting cast steel consisting essentially of C in the range from 0.30 to 0.55 percent, Si in the range from 0.2 percent, Mn in the range from 0.5+ to 3 percent, Ni in the range from 15 to 40 percent, Cr in the range from 20 to 30 percent, Ti in the range from 0.05 to 0.6 percent, a rare earth metal alloy containing Ce and La as the main components added in the range from 0.05 to 0.5 percent, Nb in the range from 0.07 to 0.7 percent and the balance substantially iron, the cast steel containing not more than 50 p.p.m. of oxygen and 400 p.p.m. of nitrogen, respectively, the percents all being by weight, said cast steel possessing a tensile strength greater than about 7 kg./mm.2, an elongation larger than about 35 percent and a reduction of area larger than about 35 percent at temperatures ranging between 850* and 1,000* C.
Claim 13
Dependent Claim
101 words
An austenitic heat-resisting cast steel consisting essentially of C in the range from 0.30 to 0.55 percent, Si in the range from 0.2 to 2.0 percent, Mn in the range from 0.5 to 3.0 percent, Ni in the range from 15 to 40 percent, Cr in the range from 20 to 30 percent, Ti in the range from 0.05 to 0.6 percent, Nb in the range from 0.07 to 0.7 percent, Misch metal containing Ce and La as the main components added in the range from 0.05 to 0.5 percent and the balance substantially iron, the percents all beinG by weight.
Claim 14
Dependent Claim
136 words
An austenitic heat-resisting cast steel consisting essentially of C in the range from 0.35 to 0.48 percent, Si in the range from 0.5 to 1.2 percent, Mn in the range from 0.7 to 2.0 percent, Ni in the range from 18 to 38 percent, Cr in the range from 23 to 28 percent, Ti in the range from 0.15 to 0.35 percent, Nb in the range from 0.1 to 0.4 percent, Misch metal containing Ce and La as the main components added in the range from 0.20 to 0.45 percent and the balance substantially iron, the cast steel containing not more than 50 p.p.m. of oxygen and 400 p.p.m. of nitrogen, respectively, the percents all being by weight, said cast steel possessing high creep rupture strength and excellent ductility at temperatures higher than about 700* C.
Claim 15
Dependent Claim
142 words
An austenitic heat-resisting cast steel of high creep rupture strength and excellent ductility at temperatures higher than about 850* C. for use in chemical apparatus consisting essentially of C in the range of from 0.30 to 0.55 percent, Si in the range from 0.2 to 2 percent, Mn in the range from 0.5 to 3 percent, Ni in the range from 18 to 38 percent, Cr in the range from 23 to 28 percent, Ti in the range from 0.05 to 0.6 percent, Nb in the range from 0.07 to 0.7 percent, a rare earth metal alloy containing Ce and La as the main components added in the range from 0.2 to 0.45 percent and the balance substantially iron, the cast steel containing not more than 50 p.p.m. of oxygen and 400 p.p.m. of nitrogen, respectively, the percents all being by weight.
Claim 16
Dependent Claim
96 words
A welding wire composed of an austenitic heat resisting steel material consisting essentially of C in the range from 0.3 to 0.55 percent, Si in the range from 0.2 to 2 percent, Mn in the range from 0.5 to 3 percent, Ti in the range from 0.05 to 0.6 percent, Nb in the range from 0.07 to 0.7 percent, a rare earth metal alloy containing Ce and La as the main components and the balance substantially iron, the amount of oxygen contained in the steel being less than 50 p.p.m., the percents all being by weight.
Claim 17
Dependent Claim
24 words
The austenitic cast steel of claim 10, wherein the amount of oxygen contained as impurities in the steel is not greater than 50 p.p.m.
Claim 18
Dependent Claim
22 words
The austenitic cast steel of claim 10, wherein the amount of nitrogen contained in the steel is not greater than 1,000 p.p.m.
References Cited (Backward Citations)
US2823992A
Cited
US3168397A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |