GB1136022A - Method for manufacturing bodies of a ferritic stainless steel - Google Patents

Method for manufacturing bodies of a ferritic stainless steel

Info

Publication number
GB1136022A
GB1136022A GB7783/66A GB778366A GB1136022A GB 1136022 A GB1136022 A GB 1136022A GB 7783/66 A GB7783/66 A GB 7783/66A GB 778366 A GB778366 A GB 778366A GB 1136022 A GB1136022 A GB 1136022A
Authority
GB
United Kingdom
Prior art keywords
powder
sintered
stainless steel
ferritic stainless
added
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
GB7783/66A
Inventor
Sven Sigvard Bergh
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.)
Wargons AB
Original Assignee
Wargons AB
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 Wargons AB filed Critical Wargons AB
Publication of GB1136022A publication Critical patent/GB1136022A/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
    • 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
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/1208—Containers or coating used therefor
    • 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
    • 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
    • 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%

Abstract

1,136,022. Sintered ferritic stainless steel. WARGONS A. B. Feb.22, 1966 [March 10, 1965], No.7783/66. Heading C7D. Sintered ferritic stainless steel is produced from a cast ingot of the steel having a Cr content of 20-55% which is heat-treated at 600‹ -900‹ C. to produce a brittle phase, the ingot is then crushed and the powder formed is sintered. The powder of minus 325 mesh U.S.A. standard may be poured into a mould and sintered as a loose powder e. g. to form bearings and filters with a porosity of 40-50%, or it may be pressed at 4/8 tons/sq. cm. or rolled in a metal sheath sintered and rolled to form rods, bars and wires. The powder is preferably annealed at 900‹ -1100‹ C. prior to forming and sintering at temperatures above 1000‹ C. Fe and/or Al powder may be added to the steel powder to suppress the formation of sigma phase e.g. 10% of a 50/50 Fe/Al alloy may be added. Alternatively the powder may be annealed in a nitrogen atmosphere to form surface nitrides. To inhibit grain growth an oxide layer is preferably formed on the powder during annealing or alternatively iron oxide may be added to the powder.
GB7783/66A 1965-03-10 1966-02-22 Method for manufacturing bodies of a ferritic stainless steel Expired GB1136022A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE312165 1965-03-10

Publications (1)

Publication Number Publication Date
GB1136022A true GB1136022A (en) 1968-12-11

Family

ID=20261437

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7783/66A Expired GB1136022A (en) 1965-03-10 1966-02-22 Method for manufacturing bodies of a ferritic stainless steel

Country Status (5)

Country Link
BE (1) BE677575A (en)
CH (1) CH439604A (en)
DE (1) DE1533421A1 (en)
GB (1) GB1136022A (en)
NL (1) NL6603018A (en)

Also Published As

Publication number Publication date
NL6603018A (en) 1966-09-12
DE1533421A1 (en) 1970-01-08
CH439604A (en) 1967-07-15
BE677575A (en) 1966-09-09

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