GB1236271A - Method of forming steel powder - Google Patents

Method of forming steel powder

Info

Publication number
GB1236271A
GB1236271A GB45164/68A GB4516468A GB1236271A GB 1236271 A GB1236271 A GB 1236271A GB 45164/68 A GB45164/68 A GB 45164/68A GB 4516468 A GB4516468 A GB 4516468A GB 1236271 A GB1236271 A GB 1236271A
Authority
GB
United Kingdom
Prior art keywords
heating zone
powder
dew point
steel powder
sept
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
GB45164/68A
Inventor
Milton Johnson
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.)
AO Smith Corp
Original Assignee
AO Smith Corp
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
Application filed by AO Smith Corp filed Critical AO Smith Corp
Publication of GB1236271A publication Critical patent/GB1236271A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/04—Decarburising
    • 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
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • B22F1/145—Chemical treatment, e.g. passivation or decarburisation
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Compounds Of Iron (AREA)

Abstract

1,236,271. Treating steel powder. A. O SMITH CORP. Sept. 23, 1968 [Sept. 28, 1967], No. 45164/68. Heading C7D. Steel powder containing iron oxide is passed through a heating zone in which it is heated to 1450-2100‹ F, and contacted with a reducing gas the dew point of which is maintained between 5 and 100‹ F. below the equilibrium value for reduction of iron oxide for the temperatures involved throughout the heating zone. The treatment softens the powder, reduces the carbon content and provides a cake-like structure which can readily be broken up. Alternatively the powder can be heated to 1600-1800‹F. at the beginning of the heating zone, the temperature being reduced to 1400-1600‹F. at the end of the heating zone. The dew point of the atmosphere is at 100-145‹F. at the beginning of the heating zone and is reduced, preferably progressively, to a value below 80‹F, at the end of the heating zone. The reducing gases, e.g. dissociated ammonia, may be passed through the furnace countercurrent to the travel of the powder and the dew point may be controlled by controlling the rate of flow of reducing gas.
GB45164/68A 1967-09-28 1968-09-23 Method of forming steel powder Expired GB1236271A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US67129067A 1967-09-28 1967-09-28

Publications (1)

Publication Number Publication Date
GB1236271A true GB1236271A (en) 1971-06-23

Family

ID=24693889

Family Applications (1)

Application Number Title Priority Date Filing Date
GB45164/68A Expired GB1236271A (en) 1967-09-28 1968-09-23 Method of forming steel powder

Country Status (3)

Country Link
FR (1) FR1582424A (en)
GB (1) GB1236271A (en)
SE (1) SE346331B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108175B1 (en) * 1982-11-02 1988-01-13 Sumitomo Metal Industries, Ltd. Process for producing alloy steel powder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE350770B (en) * 1971-05-14 1972-11-06 Hoeganaes Ab

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108175B1 (en) * 1982-11-02 1988-01-13 Sumitomo Metal Industries, Ltd. Process for producing alloy steel powder

Also Published As

Publication number Publication date
DE1783068B2 (en) 1977-05-26
SE346331B (en) 1972-07-03
FR1582424A (en) 1969-09-26
DE1783068A1 (en) 1971-03-18

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