Global Patent Index - EP 0866145 A3

EP 0866145 A3 19981223 - Completely martensitic steel alloy

Title (en)

Completely martensitic steel alloy

Title (de)

Vollmartensitsche Stahllegierung

Title (fr)

Alliage d'acier complètement martensitique

Publication

EP 0866145 A3 19981223 (DE)

Application

EP 98810193 A 19980309

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

C22C 38/24; C22C 38/00; C21D 1/00; C21D 1/26

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)

Citation (search report)

  • [Y] DE 4212966 A1 19931021 - VER SCHMIEDEWERKE GMBH [DE]
  • [A] GB 796733 A 19580618 - BIRMINGHAM SMALL ARMS CO LTD
  • [A] US 5310431 A 19940510 - BUCK ROBERT F [US], et al
  • [XY] GOECMEN ET AL.: "Precipitation Behaviour and Stability of Nitrides in High Nitrogen Martensitic 9% and 12% Chromium Steels", ISIJ INTERNATIONAL, vol. 36, no. 7, 1996, pages 768 - 776, XP002081258
  • [XY] PATENT ABSTRACTS OF JAPAN vol. 097, no. 001 31 January 1997 (1997-01-31)

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT 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