GB1475852A - Process for the production of low apparent density water atomized steel powders - Google Patents
Process for the production of low apparent density water atomized steel powdersInfo
- Publication number
- GB1475852A GB1475852A GB579675A GB579675A GB1475852A GB 1475852 A GB1475852 A GB 1475852A GB 579675 A GB579675 A GB 579675A GB 579675 A GB579675 A GB 579675A GB 1475852 A GB1475852 A GB 1475852A
- Authority
- GB
- United Kingdom
- Prior art keywords
- particles
- apparent density
- powder
- psc
- finer
- 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
- C22C33/0235—Starting from compounds, e.g. oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
1475852 Making metal powders USS ENGS & CONSULTANTS Inc 11 Feb 1975 [11 Feb 1974] 5796/75 Addition to 1475421 Heading B3A Steel powder with an apparent density of less than 2À8 gm/cc and composed of particles substantially all finer than 80 mesh is made from water atomized steel particles at least 80% of which are finer than 80 mesh and having a particle size characteristic (PSC) of between 1À0 and 2À7, by annealing the particles at a temperature in the range 1400 to 2100F to soften them, to reduce the oxygen content to below 0À2 per cent by wt., and to sinter the particles together, and feeding the sintered particles to a disc mill operated at such speed and will gap as to produce the required powder. A particular way of calculating the PSC of a powder is specified, and an equation giving the apparent density in terms of PSC, mill speed, and mill gap is given. Preferably, at least 95% of the particles as atomized are finer than 80 mesh. The annealing is carried out in a decarburizing reducing atmosphere e.g. hydrogen or dissociated ammonia to reduce the carbon content to below 0À1%, preferably below 0À01%, from a value of up to 0À8%, preferably below 0À15%, and the final powder preferably has an apparent density less than 2À6 gm/cc. The apparent density may be slightly decreased by using temperatures at the higher end of the range, e.g. 1800-2100 F.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/441,609 US3954461A (en) | 1973-08-16 | 1974-02-11 | Process for the production of low apparent density water atomized steel powders |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1475852A true GB1475852A (en) | 1977-06-10 |
Family
ID=23753564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB579675A Expired GB1475852A (en) | 1974-02-11 | 1975-02-11 | Process for the production of low apparent density water atomized steel powders |
Country Status (13)
Country | Link |
---|---|
JP (1) | JPS5740201B2 (en) |
AU (1) | AU7751075A (en) |
BE (1) | BE825187R (en) |
BR (1) | BR7500785A (en) |
CA (1) | CA1046386A (en) |
DE (1) | DE2504100A1 (en) |
ES (1) | ES434589A2 (en) |
FR (1) | FR2260406B2 (en) |
GB (1) | GB1475852A (en) |
IT (1) | IT1046946B (en) |
NL (1) | NL7501610A (en) |
NO (1) | NO143730C (en) |
SE (1) | SE7501284L (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0191265B1 (en) * | 1984-12-28 | 1989-09-06 | MANNESMANN Aktiengesellschaft | Fertilizer substrate containing iron powder |
-
1975
- 1975-01-22 AU AU77510/75A patent/AU7751075A/en not_active Expired
- 1975-01-31 DE DE19752504100 patent/DE2504100A1/en not_active Ceased
- 1975-02-04 IT IT67288/75A patent/IT1046946B/en active
- 1975-02-04 BE BE153065A patent/BE825187R/en active
- 1975-02-05 SE SE7501284A patent/SE7501284L/xx unknown
- 1975-02-06 JP JP50014944A patent/JPS5740201B2/ja not_active Expired
- 1975-02-07 BR BR785/75A patent/BR7500785A/en unknown
- 1975-02-10 ES ES434589A patent/ES434589A2/en not_active Expired
- 1975-02-10 CA CA219,695A patent/CA1046386A/en not_active Expired
- 1975-02-10 NO NO750408A patent/NO143730C/en unknown
- 1975-02-11 FR FR7504251A patent/FR2260406B2/fr not_active Expired
- 1975-02-11 GB GB579675A patent/GB1475852A/en not_active Expired
- 1975-02-11 NL NL7501610A patent/NL7501610A/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
ES434589A2 (en) | 1977-05-01 |
IT1046946B (en) | 1980-07-31 |
CA1046386A (en) | 1979-01-16 |
AU7751075A (en) | 1976-07-22 |
NO143730B (en) | 1980-12-29 |
BR7500785A (en) | 1975-11-25 |
DE2504100A1 (en) | 1975-08-14 |
NO750408L (en) | 1975-08-12 |
FR2260406A2 (en) | 1975-09-05 |
NO143730C (en) | 1981-04-08 |
JPS5740201B2 (en) | 1982-08-26 |
NL7501610A (en) | 1975-08-13 |
SE7501284L (en) | 1975-08-12 |
JPS50115161A (en) | 1975-09-09 |
FR2260406B2 (en) | 1978-10-27 |
BE825187R (en) | 1975-08-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |