(19)
(11) EP 4 379 085 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.08.2024 Bulletin 2024/33

(43) Date of publication A2:
05.06.2024 Bulletin 2024/23

(21) Application number: 23176186.7

(22) Date of filing: 30.05.2023
(51) International Patent Classification (IPC): 
C22C 38/48(2006.01)
C22C 38/04(2006.01)
C22C 38/46(2006.01)
C21D 6/02(2006.01)
C21D 1/18(2006.01)
C21D 1/26(2006.01)
 C22C 38/44(2006.01)
C22C 38/02(2006.01)
C21D 8/00(2006.01)
C21D 6/00(2006.01)
C21D 1/22(2006.01)
(52) Cooperative Patent Classification (CPC):
C22C 38/02; C22C 38/44; C22C 38/48; C22C 38/46; C22C 38/04; C21D 6/02; C21D 6/004; C21D 8/005; C21D 1/18; C21D 1/22; C21D 1/26
(84) Designated Contracting States:
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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA
Designated Validation States:
KH MA MD TN

(30) Priority: 16.06.2022 CN 202210679727

(71) Applicant: General Electric Technology GmbH
5400 Baden (CH)

(72) Inventors:
  • LI, Yuanping
    Shanghai, 201203 (CN)
  • LI, Qian
    Shanghai, 201203 (CN)

(74) Representative: Openshaw & Co. 
8 Castle Street
Farnham, Surrey GU9 7HR
Farnham, Surrey GU9 7HR (GB)

   


(54) MICROALLOYED MARTENSITIC STAINLESS STEEL GRADE 403CB WITH IMPROVED TOUGHNESS AND STRENGTH


(57) The microalloyed martensitic stainless steel grade 403Cb disclosed herein specifies a composition range including a minimum level and a maximum level that improves material properties leading to increased toughness and strength. In addition, a chromium-nickel equivalent balance (CNB) is controlled within a proper level. With increased toughness and strength, the sensitivity to temper brittleness is decreased.







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