EP 3870730 A1 20210901 - A METHOD OF PRODUCING A HIGH SPEED STEEL ALLOY
Title (en)
A METHOD OF PRODUCING A HIGH SPEED STEEL ALLOY
Title (de)
VERFAHREN ZUR HERSTELLUNG EINER HOCHGESCHWINDIGKEITSSTAHLLEGIERUNG
Title (fr)
PROCÉDÉ DE PRODUCTION D'UN ALLIAGE D'ACIER À HAUTE VITESSE
Publication
Application
Priority
- SE 1851330 A 20181026
- IB 2019001160 W 20191024
Abstract (en)
[origin: WO2020084352A1] A method of producing a high speed steel alloy containing, in percent by weight (wt.%): C 1.00-1.10, N 0.005-0.025, Cr 3.80- 4.40, Mo 3.90-4.50, W 0-1.0, Co 0-0.99, V 1.8-2.2, Nb 0-0.30, Mn 0.20-0.40, Si 1.40-1.55, Ni 0-0.50, and Cu 0-0.50, the balance being Fe and normally occurring impurities, and wherein said method comprises the following steps: providing a melt of said alloy, casting said melt followed by solidification thereof, hot forming the alloy into a predetermined body, soft annealing the solidified alloy, and hardening said body of the alloy at a hardening temperature T in the range of 1100°C-1200°C for a predetermined time t which is in the range of t1-t2, wherein t1 is a time which is sufficient for carbide-forming elements of the alloy to be dissolved in an austenitic structure presented by the alloy. Maximum hardening time t2 is below a time at which a medium austenite grain size of the alloy, as measured with the Snyder- Graff method, is such that the Snyder-Graff intercept grain size number (SG) is at least 13.
IPC 8 full level
C22C 38/42 (2006.01); C21D 1/18 (2006.01); C21D 6/00 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/30 (2006.01)
CPC (source: EP SE)
C21D 1/18 (2013.01 - EP SE); C21D 1/25 (2013.01 - EP); C21D 1/78 (2013.01 - EP); C21D 6/001 (2013.01 - SE); C21D 6/002 (2013.01 - EP SE); C21D 6/005 (2013.01 - SE); C21D 6/007 (2013.01 - SE); C21D 6/008 (2013.01 - SE); C21D 8/005 (2013.01 - EP); C21D 8/065 (2013.01 - EP); C21D 9/0068 (2013.01 - EP); C22C 38/001 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/22 (2013.01 - EP); C22C 38/24 (2013.01 - EP); C22C 38/34 (2013.01 - EP); C22C 38/42 (2013.01 - EP SE); C22C 38/44 (2013.01 - EP); C22C 38/46 (2013.01 - EP); C22C 38/48 (2013.01 - EP); C22C 38/52 (2013.01 - EP); B21C 25/00 (2013.01 - EP); C21D 6/004 (2013.01 - SE); C21D 2211/001 (2013.01 - EP SE); C21D 2211/008 (2013.01 - EP); C22C 1/02 (2013.01 - EP); C22C 38/20 (2013.01 - EP); C22C 38/22 (2013.01 - SE); C22C 38/24 (2013.01 - SE); C22C 38/26 (2013.01 - EP); C22C 38/30 (2013.01 - EP SE)
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
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2020084352 A1 20200430; BR 112021007468 A2 20210810; CN 113166895 A 20210723; EP 3870730 A1 20210901; EP 3870730 A4 20220720; SE 1851330 A1 20200427; SE 542781 C2 20200707
DOCDB simple family (application)
IB 2019001160 W 20191024; BR 112021007468 A 20191024; CN 201980070101 A 20191024; EP 19876810 A 20191024; SE 1851330 A 20181026