GB797287A - Improvements in or relating to a method of making a heat-treatable article of stainless steel - Google Patents
Improvements in or relating to a method of making a heat-treatable article of stainless steelInfo
- Publication number
- GB797287A GB797287A GB16145/55A GB1614555A GB797287A GB 797287 A GB797287 A GB 797287A GB 16145/55 A GB16145/55 A GB 16145/55A GB 1614555 A GB1614555 A GB 1614555A GB 797287 A GB797287 A GB 797287A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hydrogen
- powdered
- per cent
- chromium
- 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
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
- C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
A method of making stainless steel articles comprises compacting a mixture consisting of low carbon, low oxygen iron powder, 11-25 per cent of powdered chromium, 0-2.5 per cent of powdered nickel, at a pressure above 50 tons per sq. in., sintering the compact at a temperature above 2000 DEG F. in a hydrogen atmosphere having a dew point below -25 DEG F., coining at above 60 tons per sq. in., and carburizing at above 2000 DEG F. in an atmosphere of hydrogen having a dew point below -15 DEG F. and in the presence of, but out of contact with, solid carbon. The carburized article may be given a homogenizing treatment in a molten salt bath. The chromium and nickel may be added as powdered elementary metals or as powdered ferro alloys. It is stated that the reducing atmosphere during sintering is critical and must be free from oxygen and moisture. The hydrogen atmosphere may be obtained by passing the hydrogen over a palladium catalyst to cause the oxygen to combine with hydrogen and then over activated alumina to remove moisture. In addition to iron, chromium and nickel the alloy may also contain silicon (1 per cent max.), sulphur, phosphorus, manganese, molybdenum, tungsten, titanium, columbium, zirconium, cobalt, up to a total of not more than 5 per cent. U.S.A. Specifications 2,333,573, 2,411,073 and 2,489,839 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US797287XA | 1954-06-15 | 1954-06-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB797287A true GB797287A (en) | 1958-07-02 |
Family
ID=22152418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16145/55A Expired GB797287A (en) | 1954-06-15 | 1955-06-06 | Improvements in or relating to a method of making a heat-treatable article of stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB797287A (en) |
-
1955
- 1955-06-06 GB GB16145/55A patent/GB797287A/en not_active Expired
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