EP 0348633 A1 19900103 - Air-hardenable steels with a duplex bainite-martensite microstructure.
Title (en)
Air-hardenable steels with a duplex bainite-martensite microstructure.
Title (de)
Lufthärtende Stähle mit Zwei-Phasen-Mikrostruktur-Bainit-Martensit.
Title (fr)
Aciers auto-trempants à structure duplex bainite-martensite.
Publication
Application
Priority
- CN 88102230 A 19880430
- US 28349188 A 19881212
Abstract (en)
Air-hardenable steels of duplex bainite/martensite microstructure consisting essentially of 0.10 to 0.7% C, 0.1 to 2% Si, 2.1 to 3.5% Mn, 0.0005 to 0.005% B, up to 3.5% Cr and preferably containing Cr in amount of at least 0.1%, balance Fe except for incidental impurities. Optional elements are up to 1.5% W, 1.0% Mo, 0.15% V, 0.2% S, 0.1% Ca, 0.1% Pb, 0.1% Ti and 0.2% total rare earths. At least 1.0% Cr is especially preferred and if below such amount, total Mn and Si is at least 3% and in such case, if C is under 0.47%, at least 0.6% Si is present. The steels are hardenable to Rc 20 to Rc 58 and have a hardenable diameter in the range between 35 mm and 80 to 100 mm by air-cooling only, together with good strength, toughness and fatigue- and wear-resistance.
IPC 1-7
IPC 8 full level
C22C 38/38 (2006.01)
CPC (source: EP)
C22C 38/38 (2013.01)
Citation (search report)
- [A] GB 2163454 A 19860226 - NIPPON STEEL CORP
- [A] EP 0136004 A1 19850403 - BRITISH STEEL CORP [GB], et al
- [A] FR 2563236 A1 19851025 - UGINE ACIERS [FR]
- [A] FR 2074278 A5 19711001 - KOBE STEEL LTD
- [A] GB 2088257 A 19820609 - SUMITOMO METAL IND
- [A] EP 0085828 A1 19830817 - MASCHF AUGSBURG NUERNBERG AG [DE]
Designated contracting state (EPC)
DE FR GB IT LU NL
DOCDB simple family (publication)
DOCDB simple family (application)
EP 89107783 A 19890428; BR 8902473 A 19890502