EP 2847358 B1 20200304 - TOUGH BAINITIC HEAT TREATMENTS ON STEELS FOR TOOLING
Title (en)
TOUGH BAINITIC HEAT TREATMENTS ON STEELS FOR TOOLING
Title (de)
SCHWERE BAINTWÄRMEBEHANDLUNGEN VON STÄHLEN ZUM PUNZEN
Title (fr)
TRAITEMENTS THERMIQUES BAINITIQUES RÉSISTANTS SUR DES ACIERS POUR OUTILLAGE
Publication
Application
Priority
- EP 12166949 A 20120507
- EP 2013059542 W 20130507
- EP 13720957 A 20130507
Abstract (en)
[origin: EP2662460A1] The invention relates to a method that has been developed to obtain good toughness and homogeneous properties through heavy sections in tool steels or likely highly alloyed steels. The microstructure attained is mostly bainitic. The method is especially good for hot work tool steels in applications demanding heavy sections and very high toughness. The method consists on the application of a low temperature bainitic transformation to tool steels presenting a low enough martensite transformation temperature (Ms). Additionally or alternatively cementite is replaced from the bainite by other finer carbides, mainly mixed carbides containing elements with stronger affinity for carbon than iron. The method is especially simple if applied to steels with high contents of Si or Al (>1.3% and >0.4% respectively) where cementite growth is impaired. The method works also well for low cost plastic injection moulding and structural steels. Even some higher alloyed tool steels can benefit from the present method.
IPC 8 full level
C21D 6/00 (2006.01); C21D 1/00 (2006.01); C21D 1/20 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/38 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP US)
C21D 1/00 (2013.01 - US); C21D 1/20 (2013.01 - EP US); C21D 6/002 (2013.01 - EP US); C21D 6/004 (2013.01 - US); C21D 6/005 (2013.01 - US); C21D 6/008 (2013.01 - US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/24 (2013.01 - EP US); C22C 38/26 (2013.01 - US); C22C 38/28 (2013.01 - US); C22C 38/38 (2013.01 - US); C22C 38/44 (2013.01 - US); C22C 38/46 (2013.01 - US); C22C 38/48 (2013.01 - US); C22C 38/50 (2013.01 - US); C22C 38/54 (2013.01 - US); C22C 38/58 (2013.01 - US); C21D 2211/002 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
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 2662460 A1 20131113; CN 104271775 A 20150107; CN 104271775 B 20180601; EP 2847358 A1 20150318; EP 2847358 B1 20200304; ES 2797627 T3 20201203; HK 1204342 A1 20151113; KR 20150006011 A 20150115; MX 2014013478 A 20150212; PL 2847358 T3 20200810; PT 2847358 T 20200617; SI 2847358 T1 20200831; US 2015114525 A1 20150430; WO 2013167628 A1 20131114
DOCDB simple family (application)
EP 12166949 A 20120507; CN 201380023778 A 20130507; EP 13720957 A 20130507; EP 2013059542 W 20130507; ES 13720957 T 20130507; HK 15104822 A 20150520; KR 20147033127 A 20130507; MX 2014013478 A 20130507; PL 13720957 T 20130507; PT 13720957 T 20130507; SI 201331728 T 20130507; US 201314399239 A 20130507