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 powders

Info

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
Application number
GB579675A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
USS Engineers and Consultants Inc
Original Assignee
USS Engineers and Consultants Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US05/441,609 external-priority patent/US3954461A/en
Application filed by USS Engineers and Consultants Inc filed Critical USS Engineers and Consultants Inc
Publication of GB1475852A publication Critical patent/GB1475852A/en
Expired legal-status Critical Current

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 2100‹F 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.
GB579675A 1974-02-11 1975-02-11 Process for the production of low apparent density water atomized steel powders Expired GB1475852A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0191265B1 (en) * 1984-12-28 1989-09-06 MANNESMANN Aktiengesellschaft Fertilizer substrate containing iron powder

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