US2504453A - Alloy steels for use at elevated temperatures - Google Patents
Alloy steels for use at elevated temperatures Download PDFInfo
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- US2504453A US2504453A US4074A US407448A US2504453A US 2504453 A US2504453 A US 2504453A US 4074 A US4074 A US 4074A US 407448 A US407448 A US 407448A US 2504453 A US2504453 A US 2504453A
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- United States
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- alloy steels
- elevated temperatures
- creep
- alloy
- composition
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
Definitions
- PatentelApr. 18, 1950 ALLOY STEELS FOR USE AT ELEVATED TEMPERATURES Dronfield, and Charles Sykes, Sheffield, England, assignors to Thos. Firth & John Brown Limited, Sheffield, Eng- Leonard Rotherham,
- This invention relates to alloy steels and to their use in th manufacture of power plant (or parts thereof) and other apparatus which in service is or may be required to operate in a range of temperature extending up to 850 C., and moreover may be subjected during such operation to considerable stress.
- alloy can be produced, which have much improved resistance to the brittle type of failure, and which show a considerable ductility, as measured by the reduction of area of a specimen fractured under creep conditions at high temperatures.
- alloys havin these improved properties form the subject of the present invention, and have the following range of composition:
- composition is as fol- Iron, remainder
- an alloy with a composition within the preferred range of analysis gave the followmg extension after testing at 650 C. at a stress of tons/sq. in.:
- alloys within the range of composition according to the invention have a high resistance to creep with a high ductility, and are particularly suitable for the blades, rotors or other highly stressed components of gas turbine or other power plant or mechanical parts, particularly in those cases where the shape of the component necessitates the use of stress-raising changes of section such as sharp fillet radii or re-entrants or other notches.
- a creep-resisting alloy steel having a composition within the following ranges:
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Description
PatentelApr. 18, 1950 ALLOY STEELS FOR USE AT ELEVATED TEMPERATURES Dronfield, and Charles Sykes, Sheffield, England, assignors to Thos. Firth & John Brown Limited, Sheffield, Eng- Leonard Rotherham,
land, a British company No Drawing. Application January 23, 1948, Se-
rial No. 4,074. In Great Britain November 18,
Section 1, Public Law 690, August 8, 1946 Patent expires November 18, 1966 1 Claim.
This invention relates to alloy steels and to their use in th manufacture of power plant (or parts thereof) and other apparatus which in service is or may be required to operate in a range of temperature extending up to 850 C., and moreover may be subjected during such operation to considerable stress.
U. S. Patent No. 2,402,814 describes and claims alloy steels having a high resistance to creep at temperatures up to 800 and 850 C. The alloys described in this specification possess a very high degree of resistance to creep, but they fail eventually by a typical intergranular type of brittle creep failure.
It has now been found that alloy can be produced, which have much improved resistance to the brittle type of failure, and which show a considerable ductility, as measured by the reduction of area of a specimen fractured under creep conditions at high temperatures.
The alloys havin these improved properties form the subject of the present invention, and have the following range of composition:
Per cent Carbon upto 1.5 Silicon up to 2.0 Manganese 1.0-10.0 Chromium 12.0-20.0, Nickel 15.0-35.0 Molybdenum 1.5- 6.0 Columbium 1.0- 5.0 Cobalt 4.0-40.0
Iron, remainder The preferred range of composition is as fol- Iron, remainder After suitable solution and precipitation heattreatments, an alloy with a composition within the preferred range of analysis gave the followmg extension after testing at 650 C. at a stress of tons/sq. in.:
0.1% in 1000 hrs.
As an example of the increased ductility, an alloy with a composition within the preferred range which was fractured in 633 hours under a load of 14.0 tons/sq. in. at 650 C. gave a. reduction of area at the point of fracture in excess of 40%. There was also complete freedom from the characteristic intergranular creep cracks even in the necked portion of the test piece.
From the above figures it wi11 be seen that alloys within the range of composition according to the invention have a high resistance to creep with a high ductility, and are particularly suitable for the blades, rotors or other highly stressed components of gas turbine or other power plant or mechanical parts, particularly in those cases where the shape of the component necessitates the use of stress-raising changes of section such as sharp fillet radii or re-entrants or other notches.
We claim:
A creep-resisting alloy steel having a composition within the following ranges:
Iron, remainder.
LEONARD ROTHERHAM. CHARLES SYKES.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 2,141,389 Hatfield Dec. 27, 1938 2,373,490 Mohling Apr. 10, 1946 2,397,034 Mohling Mar. 19, 1946 2,408,771 German Oct. 8, 1946 2,423,738 Thielemann July 8, 1947
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2504453X | 1946-11-18 |
Publications (1)
Publication Number | Publication Date |
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US2504453A true US2504453A (en) | 1950-04-18 |
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Application Number | Title | Priority Date | Filing Date |
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US4074A Expired - Lifetime US2504453A (en) | 1946-11-18 | 1948-01-23 | Alloy steels for use at elevated temperatures |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2617725A (en) * | 1950-10-07 | 1952-11-11 | Hugh P Owens | Alloy metals for use in dental castings |
US2772155A (en) * | 1952-10-18 | 1956-11-27 | Sulzer Ag | Heat-resisting austenitic steel alloys |
US2777766A (en) * | 1952-06-04 | 1957-01-15 | Union Carbide & Carbon Corp | Corrosion resistant alloys |
US3135602A (en) * | 1957-02-11 | 1964-06-02 | Babcock & Wilcox Co | 45% iron base austenitic cr-ni alloy with 18-22% cr, 27-32% ni or (ni+co) plus strengthening additions |
US3243285A (en) * | 1962-02-05 | 1966-03-29 | Int Nickel Co | High strength welding materials |
US3508912A (en) * | 1965-12-15 | 1970-04-28 | Crucible Inc | Tool steel containing chromium and cobalt |
US3993475A (en) * | 1974-04-20 | 1976-11-23 | Duraloy Blaw-Knox, Inc. | Heat resisting alloys |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2141389A (en) * | 1937-04-19 | 1938-12-27 | Thos Firth & John Brown Ltd | Alloy steel |
US2373490A (en) * | 1943-01-23 | 1945-04-10 | Allegheny Ludlum Steel | Heat-resisting alloys |
US2397034A (en) * | 1944-04-21 | 1946-03-19 | Allegheny Ludlum Steel | Heat-resisting alloys containing cobalt |
US2408771A (en) * | 1944-01-01 | 1946-10-08 | Driver Harris Co | Austenitic chromium-nickel-iron alloy |
US2423738A (en) * | 1941-03-01 | 1947-07-08 | Gen Electric | Forgeable alloy for hightemperature use |
-
1948
- 1948-01-23 US US4074A patent/US2504453A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2141389A (en) * | 1937-04-19 | 1938-12-27 | Thos Firth & John Brown Ltd | Alloy steel |
US2423738A (en) * | 1941-03-01 | 1947-07-08 | Gen Electric | Forgeable alloy for hightemperature use |
US2373490A (en) * | 1943-01-23 | 1945-04-10 | Allegheny Ludlum Steel | Heat-resisting alloys |
US2408771A (en) * | 1944-01-01 | 1946-10-08 | Driver Harris Co | Austenitic chromium-nickel-iron alloy |
US2397034A (en) * | 1944-04-21 | 1946-03-19 | Allegheny Ludlum Steel | Heat-resisting alloys containing cobalt |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2617725A (en) * | 1950-10-07 | 1952-11-11 | Hugh P Owens | Alloy metals for use in dental castings |
US2777766A (en) * | 1952-06-04 | 1957-01-15 | Union Carbide & Carbon Corp | Corrosion resistant alloys |
US2772155A (en) * | 1952-10-18 | 1956-11-27 | Sulzer Ag | Heat-resisting austenitic steel alloys |
US3135602A (en) * | 1957-02-11 | 1964-06-02 | Babcock & Wilcox Co | 45% iron base austenitic cr-ni alloy with 18-22% cr, 27-32% ni or (ni+co) plus strengthening additions |
US3243285A (en) * | 1962-02-05 | 1966-03-29 | Int Nickel Co | High strength welding materials |
US3508912A (en) * | 1965-12-15 | 1970-04-28 | Crucible Inc | Tool steel containing chromium and cobalt |
US3993475A (en) * | 1974-04-20 | 1976-11-23 | Duraloy Blaw-Knox, Inc. | Heat resisting alloys |
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