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1. WO1996003532 - MARTENSITIC STAINLESS STEEL HAVING EXCELLENT HOT WORKABILITY AND SULFIDE STRESS CRACKING RESISTANCE

Publication Number WO/1996/003532
Publication Date 08.02.1996
International Application No. PCT/JP1995/001453
International Filing Date 21.07.1995
Chapter 2 Demand Filed 28.08.1995
IPC
C21D 6/00 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
6Heat treatment of ferrous alloys
C22C 38/42 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
42with copper
C22C 38/44 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
44with molybdenum or tungsten
CPC
C21D 2211/008
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
2211Microstructure comprising significant phases
008Martensite
C21D 6/004
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
6Heat treatment of ferrous alloys
004containing Cr and Ni
C22C 38/42
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
42with copper
C22C 38/44
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
44with molybdenum or tungsten
Applicants
  • NIPPON STEEL CORPORATION [JP/JP]; 6-3, Otemachi 2-chome Chiyoda-ku Tokyo 100-71, JP (AllExceptUS)
  • ASAHI, Hitoshi [JP/JP]; JP (UsOnly)
  • HARA, Takuya [JP/JP]; JP (UsOnly)
  • KAWAKAMI, Akira [JP/JP]; JP (UsOnly)
Inventors
  • ASAHI, Hitoshi; JP
  • HARA, Takuya; JP
  • KAWAKAMI, Akira; JP
Agents
  • SATO, Kazuo ; Kyowa Patent & Law Office Fuji Building, Room 323 2-3, Marunouchi 3-chome Chiyoda-ku Tokyo 100, JP
Priority Data
6/16946721.07.1994JP
6/28691321.11.1994JP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MARTENSITIC STAINLESS STEEL HAVING EXCELLENT HOT WORKABILITY AND SULFIDE STRESS CRACKING RESISTANCE
(FR) ACIER INOXYDABLE MARTENSITIQUE POSSEDANT DES PROPRIETES EXCELLENTES DE FAÇONNAGE A CHAUD ET DE RESISTANCE A LA FISSURATION PROVOQUEE PAR LES CONTRAINTES EXERCEES PAR LE SULFURE
Abstract
(EN)
A martensitic stainless steel capable of developing a tempered martensitic structure, comprising by weight C: 0.005 to 0.05 %, Si$m(F)0.50 %, Mn: 0.1 to 1$m(G) %, P$m(F)0.03 %, S$m(F)0.005 %, Mo: 1.0 to 3.0 %, Cu: 1.0 to 4.0 %, Ni: 5 to 8 %, Al$m(F)0.06 %, Cr and Mo satisfying a requirement represented by the formula Cr+1.6Mo$m(G)13; and C, N, Ni, Cu, Cr and Mo satisfying a requirement represented by the formula Ni(eq): 40C+34N+Ni+0.3Cu-1.1Cr-1.8Mo$m(G)-10.5, and optionally at least one member selected from the group consisting of Ti, Zr, Ca and REM, with the balance consisting essentially of Fe. The present invention provides a martensitic stainless steel having excellent resistance to corrosion by CO2 and sulfide stress cracking and good hot workability.
(FR)
Acier inoxydable martensitique capable d'acquérir une structure de revenu martensitique, présentant la composition suivante en poids: C 0,005 à 0,05 %, Si$m(F)0,50 %, Mn 0,1 à 1 %, P$m(F)0,03 %, S$m(F)0,005 %, Mo 1 à 3 %, Cu 1 à 4 %, Ni 5 à 8 %, Al$m(F)0,06 %, Cr et Mo répondant à un besoin représenté par la formule Cr+1,6Mo$m(G)13 et C, N, Ni, Cu, Cr et Mo répondant à un besoin représenté par la formule Ni (eq): 40C+34N+Ni+0,3Cu-1,1Cr-1,8Mo$m(G)-10,5 et possédant éventuellement un élément sélectionné à partir du groupe constitué par Ti, Zr, Ca et REM, le reste étant essentiellement constitué par Fe. L'invention permet d'obtenir un acier martensitique possédant une excellente résistance à la corrosion par CO2 et à la fissuration provoquée par des contraintes exercées par le sulfure, ainsi qu'une capacité appréciable de façonnage à chaud.
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