EP 2535430 B1 20181212 - Tool steel for high-performance thermoforming tools and production process for same
Title (en)
Tool steel for high-performance thermoforming tools and production process for same
Title (de)
Werkzeugstahl für höher beanspruchte Warmumformungswerkzeuge sowie dessen Herstellungsprozess
Title (fr)
Acier à outil pour outils de formage à chaud plus sollicités et son procédé de fabrication
Publication
Application
Priority
- EP 11004855 A 20110615
- EP 11006269 A 20110625
- EP 11008259 A 20111007
Abstract (en)
[origin: EP2535430A2] Tool steel comprises (in mass%): carbon (0.28-0.40), silicon (0.03-0.5), manganese (0.03-0.7), chromium (2-3.5), nickel (0.3-1), molybdenum (0.6-1.6), vanadium (0.15-0.35), tungsten (0.001-1), niobium (0.01-0.1), and iron and common impurities (remaining amount), where the steel has a fine grained tough structure. Independent claims are also included for: (1) producing the tool steel, comprising carrying out the crude steel production in an electric arc furnace or Linz and Donawitz converter (LD converter) with subsequent secondary metallurgical treatment of the melt in the ladle furnace and/or degassing systems, where silicon-, aluminum-, carbon- and/or diffusion deoxidation is included as deoxidation process; and (2) producing blanks for hot working tools from produced forging, comprising tempering the blanks after a mechanical processing, where the austenitized workpieces are tempered at 850-950[deg] C in a medium of oil, polymer or water, and machined workpieces are cured in a lead- or salt bath, or alternatively in a hot bath simulation in vacuum.
IPC 8 full level
C21D 1/18 (2006.01); C21C 5/00 (2006.01); C21D 7/13 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01)
CPC (source: EP)
C21D 1/18 (2013.01); C21D 7/13 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C21C 5/00 (2013.01); C21D 2211/004 (2013.01)
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)
EP 2535430 A2 20121219; EP 2535430 A3 20140305; EP 2535430 B1 20181212; ES 2716421 T3 20190612; PL 2535430 T3 20190628; PT 2535430 T 20190219; SI 2535430 T1 20190329
DOCDB simple family (application)
EP 11008259 A 20111007; ES 11008259 T 20111007; PL 11008259 T 20111007; PT 11008259 T 20111007; SI 201131649 T 20111007