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1. WO2013100614 - AUSTENITIC STEEL HAVING SUPERIOR MACHINABILITY AND CRYOGENIC TEMPERATURE TOUGHNESS IN WELD HEAT AFFECTED ZONES THEREOF AND METHOD FOR MANUFACTURING SAME

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Publication Number WO/2013/100614
Publication Date 04.07.2013
International Application No. PCT/KR2012/011537
International Filing Date 27.12.2012
IPC
C22C 38/00 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/38 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
38with more than 1.5% by weight of manganese
B23K 31/02 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
31Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups B23K1/-B23K28/193
02relating to soldering or welding
C21D 9/50 2006.1
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
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
50for welded joints
CPC
B23K 2101/00
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
2101Articles made by soldering, welding or cutting
B23K 31/02
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
31Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
02relating to soldering or welding
B23K 35/3073
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
35Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
22characterised by the composition or nature of the material
24Selection of soldering or welding materials proper
30with the principal constituent melting at less than 1550 degrees C
3053Fe as the principal constituent
3073with Mn as next major constituent
C21D 6/005
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, e.g. BY DECARBURISATION OR TEMPERING
6Heat treatment of ferrous alloys
005containing Mn
C21D 9/46
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, e.g. BY DECARBURISATION OR TEMPERING
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
46for sheet metals
C21D 9/505
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, e.g. BY DECARBURISATION OR TEMPERING
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
50for welded joints
505Cooling thereof
Applicants
  • 주식회사 포스코 POSCO [KR]/[KR]
Inventors
  • 이순기 LEE, Soon-Gi
  • 최종교 CHOI, Jong-Kyo
  • 박영환 PARK, Young-Hwan
  • 노희군 NOH, Hee-Goon
  • 조현관 CHO, Hyun-Kwan
  • 서인식 SUH, In-Shik
  • 박인규 PARK, In-Gyu
  • 이홍주 LEE, Hong-Ju
Agents
  • 특허법인 씨엔에스 C&S PATENT AND LAW OFFICE
Priority Data
10-2011-014396627.12.2011KR
10-2012-015150821.12.2012KR
Publication Language Korean (ko)
Filing Language Korean (KO)
Designated States
Title
(EN) AUSTENITIC STEEL HAVING SUPERIOR MACHINABILITY AND CRYOGENIC TEMPERATURE TOUGHNESS IN WELD HEAT AFFECTED ZONES THEREOF AND METHOD FOR MANUFACTURING SAME
(FR) ACIER AUSTÉNITIQUE PRÉSENTANT UNE USINABILITÉ ET UNE RÉSISTANCE AUX TEMPÉRATURES CRYOGÉNIQUES AMÉLIORÉES DANS DES ZONES AFFECTÉES PAR LA TEMPÉRATURE DE SOUDAGE, ET PROCÉDÉ DE PRODUCTION CORRESPONDANT
(KO) 피삭성 및 용접 열영향부 극저온 인성이 우수한 오스테나이트계 강재 및 그의 제조방법
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Abstract
(EN) Provided are austenitic steel having superior machinability and cryogenic temperature toughness in weld heat affected zones thereof and a method for manufacturing the same, the austenitic steel comprising, in weight %, 15 to 35% of manganese (Mn), carbon(C) that satisfies 23.6C+Mn ≥ 28 and 33.5C-Mn ≤ 23, 5% or lower (but not 0%) of copper (Cu), chrome (Cr) that satisfies 28.5C+4.4Cr ≤ 57 (but not 0%), the remainder being Fe and other inevitable impurities, the Charpy impact value of the weld heat affected zones at -196˚C being 41J or higher. According to the present invention, austenitic steel having superior machinability and cryogenic temperature toughness in weld heat affected zones thereof is provided in which the cryogenic steel is obtained in an inexpensive manner, a stable austenite phase can be formed at a low temperature and the generation of carbide can be effectively inhibited.
(FR) L'invention concerne un acier austénitique présentant une usinabilité et une résistance aux températures cryogéniques améliorées dans des zones affectées par la température de soudage, ainsi qu'un procédé de production correspondant, cet acier austénitique comportant, en pourcentages en poids, 15 à 35% de manganèse (Mn), du carbone (C) pour une proportion de 23.6C+Mn ≥ 28 et de 33.5C-Mn ≤ 23, 5% ou moins (mais pas 0%) de cuivre (Cu), du chrome (Cr) pour une proportion de 28.5C+4.4Cr ≤ 57 (mais pas 0%), le reste étant Fe et d'autres impuretés inévitables, la valeur d'impact Charpy des zones affectées par la température de soudage à -196˚C étant de 41J ou plus. Selon l'invention, cet acier austénitique présentant une usinabilité et une résistance aux températures cryogéniques améliorées dans des zones affectées par la température de soudage présente un acier cryogénique obtenu de manière peu coûteuse, une phase d'austénite stable peut être formée à basse température et la génération de carbure peut être efficacement inhibée.
(KO) 중량%로, 망간(Mn): 15~35%, 23.6C+Mn≥28 및 33.5C-Mn≤23을 만족하는 탄소(C), 구리(Cu): 5%이하(0%는 제외), 28.5C+4.4Cr≤57을 만족하는 크롬(Cr) (0%는 제외), 잔부 철(Fe) 및 기타 불가피한 불순물을 포함하며, 용접 열영향부의 -196℃에서의 샤르피 충격값이 41J 이상인, 피삭성 및 용접 열영향부 극저온 인성이 우수한 오스테나이트계 강재 및 그의 제조방법이 제공된다. 본 발명에 따르면, 저비용의 극저온 강재를 얻을 수 있고, 저온에서 안정한 오스테나이트 상을 형성하고 탄화물 형성을 효과적으로 억제하며, 피삭성 및 용접 열영향부 극저온 인성이 우수한 구조용 강재를 제공할 수 있다.
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