EP 2582856 A1 20130424 - METHOD FOR MANUFACTURING MECHANICAL COMPONENTS MADE OF PARTICULARLY WEAR-RESISTANT AUSTEMPERED SPHEROIDAL CAST IRON
Title (en)
METHOD FOR MANUFACTURING MECHANICAL COMPONENTS MADE OF PARTICULARLY WEAR-RESISTANT AUSTEMPERED SPHEROIDAL CAST IRON
Title (de)
METHODE ZUR HERSTELLUNG MECHANISCHER KOMPONENTEN AUS BESONDERS VERSCHLEISSFESTEM, ZWISCHENSTUFENVERGÜTETEM SPHÄROGUSS
Title (fr)
MÉTHODE DE FABRICATION DE COMPOSANTS MÉCANIQUES EN FONTE SPÉROÏDALE BAINITIQUE PARTICULIÈREMENT RÉSISANTE À L'ABRASION
Publication
Application
Priority
- IT VR20100124 A 20100618
- EP 2011060166 W 20110617
Abstract (en)
[origin: WO2011157840A1] A method for manufacturing mechanical components made of spheroidal cast iron, characterized in that it comprises the following steps: - providing a casting of a mechanical cast iron component with a percentage of pearlitic structure greater than 70%, having a carbon content comprised between 2.5% and 4.0%, a silicon content comprised between 1.5% and 3.5%, a manganese content comprised between 0.6% and 1.2%, a molybdenum content comprised between 0% and 1%, and a chromium content comprised between 0% and 0.5%; - bringing the cast iron casting with a percentage of pearlitic structure greater than 70% to a temperature that is higher than the upper austenitization temperature (Ac3) for the time required to obtain a fully austenitic structure; - performing a thermal treatment for interrupted quenching in a salt bath, comprising a step of cooling the mechanical components in a salt bath at a cooling rate that is higher than the critical rate and an isothermal holding step at a temperature comprised between 250 °C and 320 °C for a time comprised between 10 minutes and 60 minutes in order to obtain a matrix comprising metastable unsaturated austenite in a percentage comprised between 40% and 90% of the total.
IPC 8 full level
C21D 1/46 (2006.01); C21D 5/00 (2006.01); C22C 33/08 (2006.01); C22C 37/00 (2006.01); C22C 37/04 (2006.01); C22C 38/08 (2006.01)
CPC (source: EP US)
C21D 1/46 (2013.01 - EP US); C21D 5/00 (2013.01 - EP US); C22C 33/08 (2013.01 - EP US); C22C 37/00 (2013.01 - EP US); C22C 37/04 (2013.01 - EP US)
Citation (search report)
See references of WO 2011157840A1
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)
WO 2011157840 A1 20111222; EP 2582856 A1 20130424; EP 2582856 B1 20160406; IT 1400634 B1 20130614; IT VR20100124 A1 20111219; US 2013105047 A1 20130502
DOCDB simple family (application)
EP 2011060166 W 20110617; EP 11725767 A 20110617; IT VR20100124 A 20100618; US 201113805310 A 20110617