US3800631A - Fe Al Cr Y Co ALLOY - Google Patents

Fe Al Cr Y Co ALLOY Download PDF

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Publication number
US3800631A
US3800631A US00252204A US3800631DA US3800631A US 3800631 A US3800631 A US 3800631A US 00252204 A US00252204 A US 00252204A US 3800631D A US3800631D A US 3800631DA US 3800631 A US3800631 A US 3800631A
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United States
Prior art keywords
percent
alloy
chromium
cobalt
approximately
Prior art date
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Expired - Lifetime
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US00252204A
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English (en)
Inventor
W Baxter
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General Electric Co
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General Electric Co
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Publication date
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Publication of US3800631A publication Critical patent/US3800631A/en
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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
    • C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt

Definitions

  • Field of the Invention pertains to the field of oxidationresistant ferrous alloys and more particularly to the class of these comprising aluminum and chromium.
  • yttrium ' percent (by weight, as are all the percentages herein given) of yttrium is claimed to protect chromium to above 1,700F. Iron plus 35 to 50 percent chromium is brittle and hot short; but the addition of 0.5 to 3 percent yttrium and 0.5 to 1 percent palladium produces an oxidation-resistant alloy which may be rolled first hot and then cold to sheet. Similarly, iron plus 25 to 35 percent chromium, 0.5 to percent yttrium and 0.1 to l'percent is oxidation resistant, as is iron plus to 95 percent chromium and 0.5 to 5 percent yttrium.
  • an alloy is desired which will not become brittle by hardening at high BRIEF DESCRIPTION OF THE DRAWING
  • the single FIGURE represents the oxidation rate at two different temperatures, and the tensile strength, of alloys of interest to this application having varying proportions of cobalt.
  • the single FIGURE shows, against abscissas of weightpercent of cobalt in the basic prior art alloy described above, the weight gain, in percent, of 0.030 inch thick strip when heated temperatures; an alloy of iron plus 0 to 15 percent' chromium. 0.5 to 12 percent aluminum, and 0.1 to 3.0 percent yttrium is markedly free from thisas compared with 25 percent chromium, 4 percent aluminum, and l percentlyttriumflhe preferred alloy is of iron plus 15 percent chromium, 4 percent aluminum, and 1 percent yttrium.
  • My invention is an alloy in which cobalt is added to an 'alloy of iron, chromium, aluminum, and yttrium, with a resulting improvement in resistance to corrosion at high-temperature and an improvement in tensile strength. While, as has been indicated, there are a variety of uses for high-temperature resistant alloys whose major constituents are widely and economically available, a particular present need which the alloy of my invention is adapted to fill is for the structure of exhaust reactors for internal combustion engines for which current interest in reducing atmospheric pollution foretells a substantial demand.
  • the preferred manner of making these alloys is melting in vacuo with induction heating in charges of about 10 to 30 pounds, which produce an ingot about three and three-quarters inches in diameter and five inches long. This is hot extruded at 1,800F. as 1 inch round bar. Thebar is then forged flat, and hot rolled at 1,800F. to about 0.060 inches thickness. This strip is then cold rolled with intermittent air annealing at '1 ,800F. to 0.030 inch thick sheet.
  • Photomicrographs of rnetallographic sections of samples of these alloys appear to indicate that it is preferable, in a composition which permits doing so, to add the yttrium and cobalt in the form of a master alloy of two parts yttrium and one part cobalt. This practice is believed to stabilize the oxidation-resistant oxide film formed by aluminum and yttrium, and to inhibit oxide stringer penetration through grain boundaries.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Exhaust Silencers (AREA)
US00252204A 1972-05-11 1972-05-11 Fe Al Cr Y Co ALLOY Expired - Lifetime US3800631A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25220472A 1972-05-11 1972-05-11

Publications (1)

Publication Number Publication Date
US3800631A true US3800631A (en) 1974-04-02

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ID=22955031

Family Applications (1)

Application Number Title Priority Date Filing Date
US00252204A Expired - Lifetime US3800631A (en) 1972-05-11 1972-05-11 Fe Al Cr Y Co ALLOY

Country Status (6)

Country Link
US (1) US3800631A (de)
JP (1) JPS4948512A (de)
DE (1) DE2312394C3 (de)
FR (1) FR2184048B1 (de)
GB (1) GB1426362A (de)
IT (1) IT984209B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5922275A (en) * 1996-05-08 1999-07-13 Denki Kagaku Kogyo Kabushiki Kaisha Aluminum-chromium alloy, method for its production and its applications

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60149986U (ja) * 1984-03-14 1985-10-04 日本電熱株式会社 ヨ−グルト製造器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2286660A (en) * 1941-04-09 1942-06-16 Lewis E Wallace Hair trimming guide for dry shavers
US3170112A (en) * 1959-02-21 1965-02-16 Deutsche Edelstahlwerke Ag Magnetic circuit means and alloy components of constant magnetic permeability therefor
US3298826A (en) * 1964-04-06 1967-01-17 Carl S Wukusick Embrittlement-resistant iron-chromium-aluminum-yttrium alloys
US3591365A (en) * 1969-01-16 1971-07-06 Santoku Metal Ind Heat resisting corrosion resisting iron chromium alloy

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635164A (en) * 1951-08-21 1953-04-14 Kanthal Ab Electric heating unit
FR1148351A (fr) * 1956-05-04 1957-12-06 Kanthal Ab Alliage résistant à la chaleur
FR1429100A (fr) * 1964-04-06 1966-02-18 Atomic Energy Commission Alliages fer-chrome-aluminium-yttrium résistant à la fragilisation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2286660A (en) * 1941-04-09 1942-06-16 Lewis E Wallace Hair trimming guide for dry shavers
US3170112A (en) * 1959-02-21 1965-02-16 Deutsche Edelstahlwerke Ag Magnetic circuit means and alloy components of constant magnetic permeability therefor
US3298826A (en) * 1964-04-06 1967-01-17 Carl S Wukusick Embrittlement-resistant iron-chromium-aluminum-yttrium alloys
US3591365A (en) * 1969-01-16 1971-07-06 Santoku Metal Ind Heat resisting corrosion resisting iron chromium alloy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5922275A (en) * 1996-05-08 1999-07-13 Denki Kagaku Kogyo Kabushiki Kaisha Aluminum-chromium alloy, method for its production and its applications

Also Published As

Publication number Publication date
JPS4948512A (de) 1974-05-10
DE2312394C3 (de) 1975-04-17
FR2184048B1 (de) 1975-08-22
IT984209B (it) 1974-11-20
GB1426362A (en) 1976-02-25
DE2312394B2 (de) 1974-09-05
DE2312394A1 (de) 1973-11-29
FR2184048A1 (de) 1973-12-21

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