EP 3704280 B1 20220413 - MARTENSITIC STAINLESS STEEL AND METHOD FOR PRODUCING SAME
Title (en)
MARTENSITIC STAINLESS STEEL AND METHOD FOR PRODUCING SAME
Title (de)
MARTENSITISCHER EDELSTAHL UND VERFAHREN ZUR HERSTELLUNG DAVON
Title (fr)
ACIER INOXYDABLE MARTENSITIQUE, ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
IB 2017056865 W 20171103
Abstract (en)
[origin: WO2019086934A1] A martensitic stainless steel, characterized in that its composition is, in percentages by weight: 0.005% ≤ C ≤ 0.30%; 0.20% ≤ Mn ≤ 2.0%; traces % ≤ Si ≤ 1.0%; 0.20% ≤ Mn + Si ≤ 1.5%; traces ≤ S ≤ 0.01%; 0 ≤ 10,000 x Mn x S ≤ 40; traces ≤ P ≤ 0.04%; 10.5% ≤ Cr ≤ 17.0%, with [Cr - 10.3 - 80 x (C + N)2] ≤ (Mn + Ni); traces ≤ Ni ≤ 4.0%; traces ≤ Mo ≤ 2.0%; traces ≤ Mo + 2W ≤ 2.0%; traces ≤ Cu ≤ 2.0%; traces ≤ Ti ≤ 0.5%; traces ≤ V ≤ 0.3%; traces ≤ Zr ≤ 0.5%; traces ≤ Al ≤ 0.2%; traces ≤ O ≤ 400 ppm; traces ≤ Ta ≤ 0.3%; traces ≤ Nb ≤ 0.3%; 0.25 ≤ (Nb + Ta)/(C + N) ≤ 8; Nb ≥ [1.2 (C + N) - 0.1]%; 0.009% ≤ N ≤ 0.2%; traces ≤ Co ≤ 2.0%; traces ≤ Cu + Co ≤ 2.0%; traces ≤ Cu + Co + Ni ≤ 4.0%; traces ≤ B ≤ 0.1%; traces ≤ rare earth + Y ≤ 0.06%; traces ≤ Ca ≤ 20 ppm; the remainder being iron and impurities resulting from production; and in that its microstructure contains at least 75% martensite, at most 20% ferrite and at most 0.5% carbides, the size of the ferrite grains being between 4 and 80 μm, preferably between 5 and 40 μm. Method for producing said steel.
IPC 8 full level
C22C 38/00 (2006.01); C21D 1/25 (2006.01); C21D 6/00 (2006.01); C21D 9/46 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/52 (2006.01); C22C 38/54 (2006.01); C21D 8/02 (2006.01)
CPC (source: EP KR US)
C21D 1/25 (2013.01 - EP KR); C21D 1/42 (2013.01 - US); C21D 6/002 (2013.01 - EP KR); C21D 6/004 (2013.01 - EP KR US); C21D 6/005 (2013.01 - US); C21D 6/008 (2013.01 - US); C21D 8/0205 (2013.01 - KR US); C21D 8/0226 (2013.01 - US); C21D 8/0236 (2013.01 - US); C21D 8/0263 (2013.01 - KR US); C21D 8/0273 (2013.01 - KR); C21D 9/46 (2013.01 - EP KR US); C22C 38/00 (2013.01 - EP); C22C 38/001 (2013.01 - EP KR US); C22C 38/002 (2013.01 - EP KR US); C22C 38/005 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP); C22C 38/42 (2013.01 - EP KR US); C22C 38/44 (2013.01 - EP KR US); C22C 38/46 (2013.01 - EP KR); C22C 38/48 (2013.01 - EP US); C22C 38/50 (2013.01 - EP KR); C22C 38/52 (2013.01 - EP); C22C 38/54 (2013.01 - EP US); C21D 8/0205 (2013.01 - EP); C21D 8/0263 (2013.01 - EP); C21D 8/0273 (2013.01 - EP); C21D 2211/004 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP KR US); C21D 2211/008 (2013.01 - EP KR US)
Citation (examination)
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
DOCDB simple family (publication)
WO 2019086934 A1 20190509; BR 112020008649 A2 20201027; BR 112020008649 B1 20230110; CN 111902551 A 20201106; EP 3704280 A1 20200909; EP 3704280 B1 20220413; JP 2021503545 A 20210212; KR 20200077583 A 20200630; US 11702717 B2 20230718; US 2020270718 A1 20200827
DOCDB simple family (application)
IB 2017056865 W 20171103; BR 112020008649 A 20171103; CN 201780098122 A 20171103; EP 17809010 A 20171103; JP 2020524610 A 20171103; KR 20207015883 A 20171103; US 201716761158 A 20171103