US2422948A - Ferrous alloy - Google Patents

Ferrous alloy Download PDF

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Publication number
US2422948A
US2422948A US577145A US57714545A US2422948A US 2422948 A US2422948 A US 2422948A US 577145 A US577145 A US 577145A US 57714545 A US57714545 A US 57714545A US 2422948 A US2422948 A US 2422948A
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US
United States
Prior art keywords
alloy
silicon
nickel
ferrous alloy
cape
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Expired - Lifetime
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US577145A
Inventor
Arthur T Cape
Charles V Foerster
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Coast Metals Inc
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Coast Metals Inc
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Publication date
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Priority to US577145A priority Critical patent/US2422948A/en
Application granted granted Critical
Publication of US2422948A publication Critical patent/US2422948A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • C22C37/08—Cast-iron alloys containing chromium with nickel

Definitions

  • This invention relates generally to ferrous alloys, but has reference more particularly to alloys which are especially adapted for hard facing purposes, but which can also be used in the form of castings.
  • the aforesaid patented alloy which is normally austenitic, can be converted to the ferritic condition, in which condition, it is tough, hard, magnetic, has a microstructure which is characterized by a good carbide distribution, can be welded without cracking, and has a coefiicient of expansion similar to that of ordinary steel.
  • the improved alloy contains from about 3% to about 5% carbon, from about 2% to about 10% nickel, from about 8% to about 22% chromium, from about 6% to about 12% molybdenum, and from about 2.25% to about 5.5% silicon, the balance of the alloy being substantially all iron.
  • the ferritic condition is maintained by preserving a ratio of the silicon to nickel in accordance with the following schedule:
  • Nickel Silicon Percent Percent 24 2. 25-5. 5 4-7 3. 50-5. 5 7-10 4. -5.
  • silicon is used in the alloy, when the nickel content is between 4% and 7%, a minimum of 3.50% silicon is used, and when the nickel content is between 7% and 10%, a minimum of 4% silicon is used.
  • the remainder of the alloy being substantially all iron, and the silicon being present in an amount which renders the metal in the as-cast state no longer austenitic but ferritic.

Description

Patented June 24, 1947 FERROUS ALLOY Arthur T. Cape, Columbus, and Charles Foerster, Canton,
1 Claim. 1
This invention relates generally to ferrous alloys, but has reference more particularly to alloys which are especially adapted for hard facing purposes, but which can also be used in the form of castings.
In our U. S. Patent No. 2,208,117, there is described a high-carbon ferrous alloy, containing substantial amounts of chromium, molybdenum and nickel, such alloy being particularly useful hard facing applications, requiring resistance to abrasion.
We have discovered that by utilizing only a portion of the nickel and chromium ranges of the aforesaid alloy and adding silicon to the alloy in a certain predetermined relation to the nickel, the aforesaid patented alloy, which is normally austenitic, can be converted to the ferritic condition, in which condition, it is tough, hard, magnetic, has a microstructure which is characterized by a good carbide distribution, can be welded without cracking, and has a coefiicient of expansion similar to that of ordinary steel.
The improved alloy contains from about 3% to about 5% carbon, from about 2% to about 10% nickel, from about 8% to about 22% chromium, from about 6% to about 12% molybdenum, and from about 2.25% to about 5.5% silicon, the balance of the alloy being substantially all iron.
The ferritic condition is maintained by preserving a ratio of the silicon to nickel in accordance with the following schedule:
Nickel Silicon Percent Percent 24 2. 25-5. 5 4-7 3. 50-5. 5 7-10 4. -5.
In other words, when the nickel content of the alloy is between 2% and 4%, a minimum of 2.25%
Ohio, assignors to Coast Metals, 1110., Canton, Ohio N 0 Drawing. Application February 9, 1945, Serial No. 577,145
silicon is used in the alloy, when the nickel content is between 4% and 7%, a minimum of 3.50% silicon is used, and when the nickel content is between 7% and 10%, a minimum of 4% silicon is used.
While the usefulness of the alloy for hard facing purposes has been emphasized, it is to be under- Nickel Silicon Percent Percent 24 2. 25-5. 5 4-7 3. 5. 5 7-10 4. 00-5. 5
the remainder of the alloy being substantially all iron, and the silicon being present in an amount which renders the metal in the as-cast state no longer austenitic but ferritic.
ARTHUR T. CAPE. CHARLES V. FOERSTER.
REFERENCES CITED The following references are of record in th file of this patent:
UNITED STATES PATENTS Number Name Date 2,292,741 Cape Aug. 11, 1942 2,208,118 Cape July 16, 1940 2,256,137 Cape Sept. 16, 1941
US577145A 1945-02-09 1945-02-09 Ferrous alloy Expired - Lifetime US2422948A (en)

Priority Applications (1)

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US577145A US2422948A (en) 1945-02-09 1945-02-09 Ferrous alloy

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5202087A (en) * 1992-07-31 1993-04-13 The Carondelet Corporation Cement cooler grate alloy

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2208118A (en) * 1939-07-18 1940-07-16 Arthur T Cape Ferrous alloy
US2256137A (en) * 1940-08-03 1941-09-16 Coast Metals Inc Ferrous alloy
US2292741A (en) * 1942-02-11 1942-08-11 Coast Metals Inc Weld rod for hard facing purposes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2208118A (en) * 1939-07-18 1940-07-16 Arthur T Cape Ferrous alloy
US2256137A (en) * 1940-08-03 1941-09-16 Coast Metals Inc Ferrous alloy
US2292741A (en) * 1942-02-11 1942-08-11 Coast Metals Inc Weld rod for hard facing purposes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5202087A (en) * 1992-07-31 1993-04-13 The Carondelet Corporation Cement cooler grate alloy

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