EP0314901A2 - Aciers au cobalt complètement austénitiques à haute résistance mécanique, contenant de l'azote et présentant une limite d'élasticité 0,2 dépassant 600 N/mm2 - Google Patents

Aciers au cobalt complètement austénitiques à haute résistance mécanique, contenant de l'azote et présentant une limite d'élasticité 0,2 dépassant 600 N/mm2 Download PDF

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Publication number
EP0314901A2
EP0314901A2 EP88114729A EP88114729A EP0314901A2 EP 0314901 A2 EP0314901 A2 EP 0314901A2 EP 88114729 A EP88114729 A EP 88114729A EP 88114729 A EP88114729 A EP 88114729A EP 0314901 A2 EP0314901 A2 EP 0314901A2
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EP
European Patent Office
Prior art keywords
nitrogen
weight
nickel
steel
steels
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.)
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Application number
EP88114729A
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German (de)
English (en)
Other versions
EP0314901A3 (fr
Inventor
Peter Dr. Dahlmann
Johannes Jachowski
Paul Pant
Gerald Stein
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.)
Fried Krupp AG Hoesch Krupp
Original Assignee
Fried Krupp AG Hoesch Krupp
Fried Krupp AG
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Publication date
Application filed by Fried Krupp AG Hoesch Krupp, Fried Krupp AG filed Critical Fried Krupp AG Hoesch Krupp
Publication of EP0314901A2 publication Critical patent/EP0314901A2/fr
Publication of EP0314901A3 publication Critical patent/EP0314901A3/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt

Definitions

  • the invention relates to high-strength fully austenitic chromium-nickel steels with at least 50% above the nitrogen solubility limit at normal pressure nitrogen contents, which are subjected to solution annealing at 1050 ° C. to 1200 ° C. and then quenched in water.
  • nitrogen in high-alloy austenitic chromium-nickel steels significantly improves the rotation limit value R p0.2 .
  • the melt When melting such steels under normal pressure, however, the melt must not be supplied with more nitrogen than the nitrogen solubility limit of the respective steel at normal pressure. Otherwise, gas bubbles form in the solidified block.
  • the nitrogen solubility limit is based on the content of the Steel on certain alloying elements that increase nitrogen solubility (e.g. chromium, manganese, molybdenum) or decrease (e.g. nickel).
  • the invention is therefore based on the object of specifying austenitic chromium-nickel steels which, in the presence of nitrogen contents which are at least 50% above the nitrogen solubility limit at normal pressure, have proof stress values of more than 600N / mm2 and whose nitrogen content is in the range above the minimum content mentioned is as low as possible.
  • the object is achieved in that austenitic chromium-nickel steels with at least 50% above the nitrogen solubility limit at normal pressure nitrogen contents, which are subjected to solution treatment at 1050 ° C to 1200 ° C and then quenched in water, with a nitrogen content of 0 , 5 to 1.5 wt .-% have a cobalt content of 6 to 12 wt .-% with the proviso that the nickel content is less than 5 wt .-%.
  • Such chrome-nickel steels have in that the alloying element nickel is substituted by the alloying element cobalt within the stated content limits, significantly higher proof stress values R p0.2 than cobalt-free austenitic chromium-nickel steels in the same heat treatment condition and with the same nitrogen content.
  • Tables 1 and 2 and FIG. 1 show: Table 1 the comparison of the mechanical properties of a chromium-nickel steel and a chromium-nickel-cobalt steel with nitrogen contents greater than 0.5% by weight, Table 2 the comparison of the mechanical properties of a chrome-nickel steel and a chrome-nickel-cobalt steel with nitrogen contents greater than 0.7% by weight, Fig. 1 the dependence of the yield strength values R p0.2 on the nitrogen content of the steel for various cobalt and nickel steels.
  • the steels listed in Tables 1 and 2 were produced using the pressure electroslag remelting process. During the remelting, the Steels continuously added silicon nitride under positive pressure to set the desired nitrogen content. The steels were then solution annealed at 1150 ° C and then quenched in water.
  • the nitrogen solubility limit at 1 bar and 1600 ° C. is 0.27% by weight.
  • a nitrogen content of 0.56% by weight could be set by the electroslag remelting under excess pressure.
  • the nitrogen content is therefore more than 50% above the nitrogen solubility limit.
  • the yield strength R p0.2 of the steel is 510 N / mm2.
  • the nitrogen content is 0.79% by weight.
  • the nitrogen solubility limit of this steel is 0.33% by weight (1 bar and 1600 ° C) and was therefore exceeded by more than 50%.
  • the steel has an elastic limit value of 640 N / mm2.
  • nitrogen solubility at normal pressure [% N]
  • the nitrogen content of the steel is understood, which corresponds to the formula from the nitrogen solubility of pure iron ([% N] Fe ) and the interaction coefficient (f X N , Y ... ) of the multi-component alloy.
  • data were used which were determined experimentally at a temperature of 1600 ° C and a pressure of 1 bar. The values were taken from the data collection by Gmelin-Durrer (Vol. 5, pp. 159a / 160a, Springer Verlag, Berlin, Heidelberg, New York 1978). Table 1 chemical composition in% Nitrogen solubility limit mechanical properties C.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Heat Treatment Of Steel (AREA)
EP88114729A 1987-10-31 1988-09-09 Aciers au cobalt complètement austénitiques à haute résistance mécanique, contenant de l'azote et présentant une limite d'élasticité 0,2 dépassant 600 N/mm2 Withdrawn EP0314901A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3736965 1987-10-31
DE19873736965 DE3736965A1 (de) 1987-10-31 1987-10-31 Hochfeste stickstoffhaltige vollaustenitische cobalstaehle mit 0,2-dehngrenzen oberhalb 600 n/mm(pfeil hoch)2(pfeil hoch)

Publications (2)

Publication Number Publication Date
EP0314901A2 true EP0314901A2 (fr) 1989-05-10
EP0314901A3 EP0314901A3 (fr) 1990-07-11

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EP88114729A Withdrawn EP0314901A3 (fr) 1987-10-31 1988-09-09 Aciers au cobalt complètement austénitiques à haute résistance mécanique, contenant de l'azote et présentant une limite d'élasticité 0,2 dépassant 600 N/mm2

Country Status (3)

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US (1) US4865661A (fr)
EP (1) EP0314901A3 (fr)
DE (1) DE3736965A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU650156B2 (en) * 1992-08-05 1994-06-09 Lions Eye Institute Limited Keratoprosthesis and method of producing the same
RU2158319C1 (ru) * 2000-04-25 2000-10-27 Институт металлургии и материаловедения им. А.А. Байкова РАН Высокопрочная коррозионно- и износостойкая аустенитная сталь

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE676284A (fr) * 1965-03-11 1966-06-16
DE2534513A1 (de) * 1974-08-02 1976-02-12 Firth Brown Ltd Rostfreie austenitstaehle
EP0151487A2 (fr) * 1984-02-07 1985-08-14 Kubota Ltd. Acier ferritique-austémitique inoxydable à deux phases
EP0231492A1 (fr) * 1985-12-20 1987-08-12 Fried. Krupp Gesellschaft mit beschränkter Haftung Acier austénitique chrome-nickel-molybdène-manganèse contenant de l'azote; procédé pour sa fabrication et ses applications

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE865604C (de) * 1940-11-03 1953-02-02 Eisen & Stahlind Ag Stahllegierung fuer Gegenstaende, die eine grosse Dauerstandfestigkeit haben muessen
GB1013239A (en) * 1964-08-13 1965-12-15 Swift Levick & Sons Ltd Improved alloy steels
JPS58224149A (ja) * 1982-06-21 1983-12-26 Mitsubishi Steel Mfg Co Ltd ガラス成形用金型鋼
DE3310693A1 (de) * 1983-03-24 1984-10-04 Fried. Krupp Gmbh, 4300 Essen Korrosionsbestaendiger chromstahl und verfahren zu seiner herstellung
CA1223140A (fr) * 1984-06-28 1987-06-23 Raynald Simoneau Acier inoxydable austenitique au cobalt ultra resistant a la cavitation erosive

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE676284A (fr) * 1965-03-11 1966-06-16
DE2534513A1 (de) * 1974-08-02 1976-02-12 Firth Brown Ltd Rostfreie austenitstaehle
EP0151487A2 (fr) * 1984-02-07 1985-08-14 Kubota Ltd. Acier ferritique-austémitique inoxydable à deux phases
EP0231492A1 (fr) * 1985-12-20 1987-08-12 Fried. Krupp Gesellschaft mit beschränkter Haftung Acier austénitique chrome-nickel-molybdène-manganèse contenant de l'azote; procédé pour sa fabrication et ses applications

Also Published As

Publication number Publication date
DE3736965A1 (de) 1989-05-11
US4865661A (en) 1989-09-12
EP0314901A3 (fr) 1990-07-11
DE3736965C2 (fr) 1992-11-05

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