EP 2065483 A1 20090603 - HOT-WORKING TOOL STEEL HAVING EXCELLENT STIFFNESS AND HIGH-TEMPERATURE STRENGTH AND METHOD FOR PRODUCTION THEREOF
Title (en)
HOT-WORKING TOOL STEEL HAVING EXCELLENT STIFFNESS AND HIGH-TEMPERATURE STRENGTH AND METHOD FOR PRODUCTION THEREOF
Title (de)
WARMARBEITSSTAHL MIT HERVORRAGENDER STEIFIGKEIT UND HOCHTEMPERATURFESTIGKEIT UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
ACIER À OUTILS POUR FORMAGE À CHAUD PRÉSENTANT D'EXCELLENTES QUALITÉS DE RIGIDITÉ ET DE RÉSISTANCE À DES TEMPÉRATURES ÉLEVÉES, ET SON PROCÉDÉ DE PRODUCTION
Publication
Application
Priority
- JP 2007067915 W 20070914
- JP 2006251003 A 20060915
Abstract (en)
Disclosed is a hot-working tool steel having improved toughness and high-temperature strength. Also disclosed is a method for producing the hot-working tool steel. The hot-working tool steel comprises the following components (by mass): C: 0.34-0.40%, Si: 0.3-0.5%, Mn: 0.45-0.75%, Ni: 0-0.5% (exclusive), Cr: 4.9-5.5%, (Mo+1/2W): 2.5-2.9% (provided that Mo and W are contained singly or in combination), and V: 0.5-0.7%, with the remainder being Fe and unavoidable impurities. Preferably, the cross-sectional structure of the hot-working tool steel upon quenching contains a granular structure and an acicular structure, wherein the granular structure (A%) accounts for 45 area% or less, the acicular structure (B%) accounts for 40 area% or less, and the remaining austenite (C%) accounts for 5 to 20 volume%.; Also disclosed is a method for producing a hot-working tool steel, which comprises tempering the above-mentioned hot-working tool steel so that a value X determined by the following relational expression between a tempered hardness (HRC) and the percentages of the tissues becomes 40 or greater. X = - 0.36 × HRC - 1.47 × A % - 1.67 × B % + 6.55 × C % + 72.91
IPC 8 full level
C22C 38/00 (2006.01); C21D 1/25 (2006.01); C21D 6/00 (2006.01); C21D 6/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/46 (2006.01)
CPC (source: EP KR US)
C21D 1/25 (2013.01 - EP KR US); C21D 6/002 (2013.01 - EP KR US); C21D 6/02 (2013.01 - KR); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/22 (2013.01 - EP KR US); C22C 38/24 (2013.01 - EP KR US); C22C 38/44 (2013.01 - KR); C22C 38/46 (2013.01 - KR); C21D 6/02 (2013.01 - EP US); C21D 2211/001 (2013.01 - EP KR US); C21D 2211/002 (2013.01 - EP KR US); C21D 2211/004 (2013.01 - EP KR US); C21D 2211/005 (2013.01 - EP KR US); C21D 2211/008 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
EP 2065483 A1 20090603; EP 2065483 A4 20160323; CN 101517114 A 20090826; CN 102994902 A 20130327; KR 20090043556 A 20090506; KR 20120006091 A 20120117; KR 20130036076 A 20130409; US 2010193089 A1 20100805; WO 2008032816 A1 20080320
DOCDB simple family (application)
EP 07807322 A 20070914; CN 200780034059 A 20070914; CN 201210316378 A 20070914; JP 2007067915 W 20070914; KR 20097005031 A 20090311; KR 20117031362 A 20070914; KR 20137006463 A 20070914; US 44040607 A 20070914