Global Patent Index - EP 3249059 A1

EP 3249059 A1 20171129 - METHOD FOR THERMAL TREATMENT OF AUSTENITIC STEELS AND AUSTENITIC STEELS THUS OBTAINED

Title (en)

METHOD FOR THERMAL TREATMENT OF AUSTENITIC STEELS AND AUSTENITIC STEELS THUS OBTAINED

Title (de)

WÄRMEBEHANDLUNGSVERFAHREN VON AUSTENITISCHEN STÄHLEN, UND SO HERGESTELLTE AUSTENITISCHE STÄHLE

Title (fr)

PROCÉDÉ DE TRAITEMENT THERMIQUE D'ACIERS AUSTÉNITIQUES ET ACIERS AUSTÉNITIQUES AINSI OBTENUS

Publication

EP 3249059 A1 20171129 (FR)

Application

EP 16171672 A 20160527

Priority

EP 16171672 A 20160527

Abstract (en)

[origin: JP2017210684A] PROBLEM TO BE SOLVED: To provide a method for facilitating machining austenitic steels.SOLUTION: The invention concerns a method for heat-treating an austenitic steel of the High Nitrogen Steel or austenitic HNS type, or an austenitic steel of the High Interstitial Steel or austenitic HIS type, the austenitic HNS or austenitic HIS containing precipitates of nitrides, carbides or carbonitrides of chromium and/or of molybdenum. The method comprises: machining the austenitic HNS or austenitic HIS containing the precipitates, and thereafter redissolving the precipitates by bringing the austenitic HNS or austenitic HIS to its austenitizing temperature; and then cooling the austenitic HNS or austenitic HIS sufficiently rapidly to avoid re-formation of the precipitates.SELECTED DRAWING: None

Abstract (fr)

L'invention concerne un procédé de traitement thermique d'aciers austénitiques HNS ou HIS qui consiste à soumettre les aciers austénitiques HNS et HIS à un traitement thermique dont la durée et la température sont telles qu'il place ces aciers austénitiques HNS et HIS dans des conditions qui permettent l'apparition de précipités tels que des nitrures, des carbures ou des carbonitrures de molybdène ou de chrome. La présence de tels précipités, généralement peu liés à la matrice du matériau, favorise la formation et l'enlèvement des copeaux lors de l'usinage des pièces. L'invention concerne également des aciers austénitiques HNS ou HIS comprenant des précipités dans leur matrice.

IPC 8 full level

C21D 6/00 (2006.01); C21D 6/02 (2006.01); C22C 38/00 (2006.01); C22C 38/18 (2006.01); C22C 38/22 (2006.01); C22C 38/38 (2006.01)

CPC (source: CN EP US)

C21D 1/18 (2013.01 - CN EP US); C21D 1/26 (2013.01 - CN); C21D 6/002 (2013.01 - EP US); C21D 6/02 (2013.01 - EP US); C21D 9/0068 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/18 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/38 (2013.01 - EP US); C21D 2211/001 (2013.01 - CN EP US); C21D 2211/004 (2013.01 - EP US); C21D 2261/00 (2013.01 - EP US)

Citation (search report)

  • [XA] US 7255755 B2 20070814 - MAZIASZ PHILIP J [US], et al
  • [XA] JP 2010280950 A 20101216 - DAIDO STEEL CO LTD, et al
  • [XA] US 4929419 A 19900529 - WEGMAN DWIGHT D [US], et al
  • [XA] CN 103233174 B 20150610 - INST METAL RES CHINESE ACAD SC
  • [XA] CH 688862 A5 19980430 - BASF AG [DE]
  • [A] US 5714115 A 19980203 - SPEIDEL MARKUS O [CH], et al
  • [A] EP 1229142 A1 20020807 - DAIDO STEEL CO LTD [JP]
  • [A] EP 1626101 A1 20060215 - DAIDO STEEL CO LTD [JP]
  • [A] SU 722966 A1 19800325 - MO METALL Z SERP MOLOT [SU]
  • [A] GB 1436655 A 19760519 - SEIKO INSTR & ELECTRONICS
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  • [XA] MARCEL SONDEREGGER ET AL: "Powder Injection Moulding Processing: Optimised Sintering and Heat Treatment of the Nickel-free High-Nitrogen MIM-Steel X15CrMnMoN17-11-3", EUROPEAN CONGRESS AND EXHIBITION ON POWDER METALLURGY. EUROPEAN PM CONFERENCE PROCEEDINGS, 1 January 2006 (2006-01-01), Shrewsbury, pages 31, XP055302770, Retrieved from the Internet <URL:http://www.listemann.com/fileadmin/user_upload/bilder/aktuelles/Euro_PM2006_Sonderegger_180.pdf>
  • [XA] MA Y X ET AL: "Study on Precipitation of High Nitrogen Containing Austenitic Stainless Steel During Isothermal Aging at Intermediate Temperature", JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL, GANGTIE YANJIU XUEBAO, CN, vol. 14, no. 5, 1 September 2007 (2007-09-01), pages 344 - 349, XP022933506, ISSN: 1006-706X, [retrieved on 20070901], DOI: 10.1016/S1006-706X(08)60108-9
  • [XA] TAE-HO LEE ET AL: "Time-temperature-precipitation characteristics of high-nitrogen austenitic Fe-18Cr-18Mn-2Mo-0.9N steel", METALLURGICAL AND MATERIALS TRANSACTIONS A, SPRINGER-VERLAG, NEW YORK, vol. 37, no. 12, 1 December 2006 (2006-12-01), pages 3445 - 3454, XP019695383, ISSN: 1543-1940
  • [XA] J.A. COTTON ET AL: "The Influence of Niobium and Vanadium on the Microstructure and Mechanical Properties of a High Nitrogen Stainless Steel", MATERIALS SCIENCE FORUM, vol. 318-320, 1 January 1999 (1999-01-01), pages 271 - 280, XP055302754, DOI: 10.4028/www.scientific.net/MSF.318-320.271
  • [XA] HUA-BING LI ET AL: "Influence of chemical composition and cold deformation on aging precipitation behavior of high nitrogen austenitic stainless steels", JOURNAL OF CENTRAL SOUTH UNIVERSITY ; SCIENCE & TECHNOLOGY OF MINING AND METALLURGY, vol. 20, no. 12, 1 December 2013 (2013-12-01), CN, pages 3354 - 3362, XP055303179, ISSN: 2095-2899, DOI: 10.1007/s11771-013-1859-2
  • [XA] SHI FENG ET AL: "Effects of Cold Deformation and Aging Process on Precipitation Behavior and Mechanical Properties of Fe-18Cr-18Mn-0.63N High-Nitrogen Austenitic Stainless Steel", STEEL RESEARCH INTERNATIONAL., 1 July 2013 (2013-07-01), DE, pages n/a - n/a, XP055302684, ISSN: 1611-3683, DOI: 10.1002/srin.201300086
  • [A] DAISUKE KURODA ET AL: "New Manufacturing Process of Nickel-Free Austenitic Stainless Steel with Nitrogen Absorption Treatment", MATERIALS TRANSACTIONS,, vol. 44, no. 3, 1 January 2003 (2003-01-01), pages 414 - 420, XP055043442, DOI: 10.2320/matertrans.44.414

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 3249060 A1 20171129; EP 3249060 B1 20210630; CN 107435087 A 20171205; CN 107435087 B 20200107; EP 3249059 A1 20171129; JP 2017210684 A 20171130; JP 6509944 B2 20190508; US 11136638 B2 20211005; US 2017342520 A1 20171130

DOCDB simple family (application)

EP 17167986 A 20170425; CN 201710383822 A 20170526; EP 16171672 A 20160527; JP 2017101408 A 20170523; US 201715589067 A 20170508