GB657818A - Austenitic steels of high nickel, chromium and cobalt content and method for the heat treatment thereof - Google Patents
Austenitic steels of high nickel, chromium and cobalt content and method for the heat treatment thereofInfo
- Publication number
- GB657818A GB657818A GB7629/48A GB762948A GB657818A GB 657818 A GB657818 A GB 657818A GB 7629/48 A GB7629/48 A GB 7629/48A GB 762948 A GB762948 A GB 762948A GB 657818 A GB657818 A GB 657818A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- chromium
- heat treatment
- cobalt content
- high nickel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
Abstract
Austenitic steel for use at high temperatures consisting of C = 0.15 per cent; Si and Mn, up to 2 per cent each; Ni, 25-40 per cent; Cr, 20.1-25 per cent; Co, 18-30 per cent; Ti, up to 1.2 per cent and either W, 2 to 6 per cent; or Mo. 1-6 per cent, or both with a total content 2-10 per cent; the balance being iron and unavoidable impurities, is softened by cooling from 800-1300 DEG C. and then reheated one or more times at 400-900 DEG C. for 2-10 hours to produce precipitation hardening. The alloy may also contain 0.2 per cent B, and a maximum of 4 per cent Al. The cooling may be stopped at a temperature above that of the medium but sufficiently low to maintain the hardening elements in solution. A forged, rolled, or cast part may be subjected to the reheating step only. The reheating may be carried out in steps to produce precipitation of the hardening elements in successive stages. The treatment may be combined with mechanical working. Specifications 371,334, 404,876, and 583,845, are referred to. The Specification as open to inspection under Sect. 91 includes also alloys having the composition C \sE 0.15 per cent; Si and Mn, up to 2.0 per cent each; Ni, 25-40 per cent; Cr, 9-25 per cent; Co, 18-30 per cent; Ti, up to 5 per cent; the balance being iron and unavoidable impurities. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR657818X | 1948-02-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB657818A true GB657818A (en) | 1951-09-26 |
Family
ID=9008686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7629/48A Expired GB657818A (en) | 1948-02-25 | 1948-03-12 | Austenitic steels of high nickel, chromium and cobalt content and method for the heat treatment thereof |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB657818A (en) |
-
1948
- 1948-03-12 GB GB7629/48A patent/GB657818A/en not_active Expired
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