GB620174A - Improvements in and relating to chromium-nickel stainless steels - Google Patents
Improvements in and relating to chromium-nickel stainless steelsInfo
- Publication number
- GB620174A GB620174A GB31459/46A GB3145946A GB620174A GB 620174 A GB620174 A GB 620174A GB 31459/46 A GB31459/46 A GB 31459/46A GB 3145946 A GB3145946 A GB 3145946A GB 620174 A GB620174 A GB 620174A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- stainless steels
- chromium
- relating
- annealed
- 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
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Stainless steels having precipitation hardening properties have the following composition:-Cr 16.5-18.5 per cent, Ni 2.85-4.85 per cent, Cu 3.0-5.0 per cent, C and N 0.14-0.21 per cent in total, at least one of these two elements being within the respective ranges of 0.1-0.16 per cent C and 0.05-0.13 N, Fe, together with the usual impurities such as S, P, Mn, Si, forming the remainder. The alloys may also contain up to 0.25 per cent of Be. The alloys may be annealed at 1700 DEG -2100 DEG F. and then transformed, either by heating within the range 1250 DEG -1600 DEG F. or by cooling the annealed steel to below 32 DEG F. to a substantially martensitic structure. Finally the transformed steel is heated within the range 850 DEG -950 DEG F. for such period of time to precipitate copper and obtain a substantial increase in hardness. The annealed steel may be quenched before transforming and between the annealing and transforming steps the alloy may be fabricated into desired articles.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US620174XA | 1945-10-23 | 1945-10-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB620174A true GB620174A (en) | 1949-03-21 |
Family
ID=22039681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31459/46A Expired GB620174A (en) | 1945-10-23 | 1946-10-23 | Improvements in and relating to chromium-nickel stainless steels |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB620174A (en) |
-
1946
- 1946-10-23 GB GB31459/46A patent/GB620174A/en not_active Expired
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