EP 1956100 B1 20190424 - METHOD OF WARM WORKING OF A STEEL MATERIAL AND STEEL MATERIAL OBTAINED BY THE SAME
Title (en)
METHOD OF WARM WORKING OF A STEEL MATERIAL AND STEEL MATERIAL OBTAINED BY THE SAME
Title (de)
VERFAHREN ZUM WARMUMFORMEN EINES STAHLMATERIALS UND DADURCH ERHALTENES STAHLMATERIAL
Title (fr)
PROCEDE D'ÉCROUISSAGE A CHAUD D'UN ACIER ET MATERIAU D'ACIER OBTENU AVEC LE PROCEDE
Publication
Application
Priority
- JP 2006323248 W 20061121
- JP 2005336331 A 20051121
Abstract (en)
[origin: EP1956100A1] There are provided a steel for warm working, to be subjected to warm working as various structures, components of cars, and the like, a warm working method thereof, and a steel material and a steel component obtainable from the warm working method. [Solving Means] A steel is to have a particle dispersion type fiber structure formed in the matrix by warm working. The steel is characterized in that the total amount of the dispersed second-phase particles at room temperature is 7 × 10 -3 or more in terms of volume fraction, and the Vickers hardness (HV) is equal to or larger than the hardness H of the following equation (2): H = (5.2 - 1.2 × 10 -4 ») × 10 2 ... (2) when the steel is subjected to any of annealing, tempering, and aging treatments in the as-unworked state under conditions such that a parameter » expressed by the following equation (1): » = T(logt + 20) (T; temperature (K), t; time (hr)) ... (1) is 1.4 × 10 4 or more in a prescribed temperature range of 350°C or more and Ac1 point or less. This steel is taken as the steel for warm working.
IPC 8 full level
C21D 8/06 (2006.01); C21D 8/02 (2006.01); C21D 8/04 (2006.01); C21D 8/10 (2006.01); C21D 9/00 (2006.01); C21D 9/46 (2006.01); C21D 9/52 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/18 (2006.01)
CPC (source: EP US)
C21D 8/0205 (2013.01 - EP US); C21D 8/0231 (2013.01 - EP US); C21D 8/0431 (2013.01 - EP US); C21D 8/065 (2013.01 - EP US); C21D 8/105 (2013.01 - EP US); C21D 9/0075 (2013.01 - EP US); C21D 9/0093 (2013.01 - EP US); C21D 9/46 (2013.01 - EP US); C21D 9/525 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/18 (2013.01 - EP US)
Citation (examination)
- JP 2003129178 A 20030508 - NIPPON STEEL CORP, et al
- US 6338763 B1 20020115 - HASHIMURA MASAYUKI [JP], et al
- YUUJI KIMURA ET AL: "Influence of Warm Tempforming on Microstructure and Mechanical Properties in an Ultrahigh-Strength Medium-Carbon Low-Alloy Steel", METALLURGICAL AND MATERIALS TRANSACTIONS A, SPRINGER-VERLAG, NEW YORK, vol. 44, no. 1, 7 September 2012 (2012-09-07), pages 560 - 576, XP035152734, ISSN: 1543-1940, DOI: 10.1007/S11661-012-1391-2
Designated contracting state (EPC)
DE
DOCDB simple family (publication)
EP 1956100 A1 20080813; EP 1956100 A4 20111109; EP 1956100 B1 20190424; JP 5344454 B2 20131120; JP WO2007058364 A1 20090507; US 2009277539 A1 20091112; WO 2007058364 A1 20070524
DOCDB simple family (application)
EP 06833094 A 20061121; JP 2006323248 W 20061121; JP 2007545344 A 20061121; US 8530406 A 20061121