EP 0866145 B1 20030507 - Heat treatment method for completely martensitic steel alloy
Title (en)
Heat treatment method for completely martensitic steel alloy
Title (de)
Wärmebehandlungsverfahren für vollmartensitische Stahllegierung
Title (fr)
Procédé de traitement thermique pour alliage d'acier complètement martensitique
Publication
Application
Priority
DE 19712020 A 19970321
Abstract (en)
[origin: EP0866145A2] A novel fully martensitic hardenable steel has the composition (by wt.) 8-15% Cr, up to 15% Co, up to 4% Mn, up to 4% Ni, up to 8% Mo, up to 6% W, 0.5-1.5% V, up to 0.15% Nb, up to 0.04% Ti, up to 0.4% Ta, up to 0.02% Zr, up to 0.02% Hf, NOTGREATER 50 ppm B, up to 0.1% C, 0.12-0.25% N, balance Fe and impurities, the sum of Mn + Ni being less than 4% and the sum of Mo + W being less than 8%. Also claimed is a heat treatment process for the above steel, comprising solution annealing at 1150-1250 degrees C for 0.5-15 hrs., cooling to room temperature and then tempering at 600-820 degrees C for 0.5-25 hrs.
IPC 1-7
IPC 8 full level
C21D 1/00 (2006.01); C21D 1/26 (2006.01); C21D 6/00 (2006.01); C22C 33/02 (2006.01); C22C 38/00 (2006.01); C22C 38/24 (2006.01); C22C 38/30 (2006.01); C22C 38/58 (2006.01); C21D 1/18 (2006.01)
CPC (source: EP US)
C21D 6/002 (2013.01 - EP US); C22C 33/0285 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/30 (2013.01 - EP US); C21D 1/18 (2013.01 - EP US)
Designated contracting state (EPC)
AT DE ES FR GB SE
DOCDB simple family (publication)
EP 0866145 A2 19980923; EP 0866145 A3 19981223; EP 0866145 B1 20030507; AT E239804 T1 20030515; DE 19712020 A1 19980924; DE 59808216 D1 20030612; ES 2199414 T3 20040216; JP 4204089 B2 20090107; JP H10265914 A 19981006; US 6030469 A 20000229
DOCDB simple family (application)
EP 98810193 A 19980309; AT 98810193 T 19980309; DE 19712020 A 19970321; DE 59808216 T 19980309; ES 98810193 T 19980309; JP 6829398 A 19980318; US 4478498 A 19980320