EP 1312691 A1 20030521 - Austenitic heat resistant alloy with improved castability and transformation, method of making steel slabs and wires
Title (en)
Austenitic heat resistant alloy with improved castability and transformation, method of making steel slabs and wires
Title (de)
Austenitische hitzebeständige Legierung mit verbesserter Vergiessbarkeit und Transformation, Verfahren zur Herstellung von Brammen und Drähten
Title (fr)
Alliage austénitique pour tenue à chaud à coulabilité et transformation améliorées, procédé de fabrication de billettes et de fils
Publication
Application
Priority
FR 0114818 A 20011116
Abstract (en)
An austenitic alloy with improved hot casting and transformation behavior has a defined composition, which also satisfies two relationships between its component elements. <??>An austenitic alloy with improved hot casting and transformation behavior has a defined composition, which also satisfies the two following relationships between its component elements: <??>(a) in relation with the mode of solidification: <??>(b) balance a = eq Nia - 0.5 x eq Cra is less than 3.6 where: <??>(c) eq Cra = Cr + 0.7 x Si + 0.2 x Mn + 1.37 x Mo + 3 x Ti + 6 x Al = 4 x V and where:; <??>(d) eq Nia = Ni + 22 x C + 0.5 x Cu; <??>(e) in relation to the residual ferrite content; <??>(f) balance b = eq Nib - 2 x eq Crb is greater than - 41 where; <??>(g) eq Crb = Cr + 0.7 x Si + 1.37 x Mo + 3 x Ti + 6 x Al + 4 x V, and where:; <??>(h) eq Nib = Ni + 22 x C + 0.5 x Cu + 0.5 x Mn. <??>Independent claims are also included for the following: <??>(a) the fabrication of a billet from this austenitic alloy; <??>(b) the fabrication of a wire from this austenitic alloy; <??>(c) the fabrication of bar from this austenitic alloy; <??>(d) an austenitic alloy piece able to be machined or hot or cold shaped or knitted from such a billet, wire or bar. <??>The composition of the austenitic alloy is, by wt: <??>(a) carbon : 0.010 - 0.04%; <??>(b) nitrogen : 0 - 0.01%; <??>(c) silicon less than 2%; <??>(d) nickel : 16 - 19.9%; <??>(e) manganese less than 8%; <??>(f) chromium : 18.1 - 21%; <??>(g) titanium : 1.8 - 3%; <??>(h) molybdenum less than 3%; <??>(i) copper less than 3%; <??>(j) aluminum less than 1.5%; <??>(k) boron less than 0.01%; <??>(l) vanadium less than 2%; <??>(m) sulfur less than 0.2%; <??>(n) phosphorus less than 0.4%; <??>(o) up to 0.5% at least of an element chosen from yttrium, cerium, lanthanum and other rare earth metals; <??>(p) the remainder being iron and production and deoxidization impurities.
Abstract (fr)
Alliage austénitique pour tenue à chaud à coulabilité et transformation améliorées dont la composition comprend, en % en poids : 0,010% < carbone < 0,04%, 0% < azote < 0,01%, silicium < 2%, 16% < nickel < 19,9%, manganèse < 8%, 18,1%< chrome < 21%, 1,8% < titane < 3%, molybdène < 3%, cuivre < 3%, aluminium < 1,5%, bore < 0,01%, vanadium < 2%, soufre < 0,2%, phosphore < 0,04% et éventuellement jusqu'à 0,5% d'au moins un élément choisi parmi l'yttrium, le cérium, le lanthane et les autres terres rares, le reste étant du fer et des impuretés résultants de l'élaboration ou de la désoxydation, ladite composition satisfaisant en outre les deux relations suivantes : en relation avec le mode de solidification : reliquat a = éq Nia - 0,5x éq Cra < 3,60 où, éq Cra = Cr + 0.7 x Si + 0.2 x Mn + 1.37 x Mo + 3 x Ti + 6 x Al + 4 x V, et où, éq Nia = Ni + 22 x C + 0.5 x Cu, en relation avec le taux de ferrite résiduel : reliquat b = éq Nib- 2 x éq Crb > - 41 où, éq Crb = Cr + 0.7 x Si + 1,37 x Mo + 3 x Ti + 6 x Al + 4 x V, et où, éq Nib = Ni + 22 x C + 0.5 x Cu + 0,5 x Mn.
IPC 1-7
C22C 38/50; C22C 38/58; C22C 38/60; C22C 38/42; C22C 38/44; C22C 38/46; C21D 6/00; C22C 38/06; C21D 8/02
IPC 8 full level
C21D 8/06 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/50 (2006.01); C22C 38/58 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP US)
C21D 8/065 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/42 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/46 (2013.01 - EP US); C22C 38/50 (2013.01 - EP US); C22C 38/58 (2013.01 - EP US); C22C 38/60 (2013.01 - EP US); C21D 2211/001 (2013.01 - EP US)
Citation (search report)
- [XA] GB 686766 A 19530128 - WESTINGHOUSE ELECTRIC INT CO
- [XA] US 3065067 A 19621120 - GEORGE AGGEN
- [XA] GB 675809 A 19520716 - ELECTRIC FURNACE PROD CO
- [XA] US 3563729 A 19710216 - KOVACH CURTIS W, et al
- [A] US 3865581 A 19750211 - SEKINO SHOZO, et al
- [AD] FR 2727982 A1 19960614 - IMPHY SA [FR]
- [A] US 3201233 A 19650817 - HULL FREDERICK C
- [A] EP 0669405 A2 19950830 - DAIDO STEEL CO LTD [JP]
- [A] PATENT ABSTRACTS OF JAPAN vol. 009, no. 153 (C - 288) 27 June 1985 (1985-06-27)
- [A] PATENT ABSTRACTS OF JAPAN vol. 013, no. 208 (C - 596) 16 May 1989 (1989-05-16)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
DOCDB simple family (publication)
EP 1312691 A1 20030521; FR 2832425 A1 20030523; FR 2832425 B1 20040730; US 2003103859 A1 20030605; US 6896747 B2 20050524
DOCDB simple family (application)
EP 02292531 A 20021015; FR 0114818 A 20011116; US 28542402 A 20021101