Global Patent Index - EP 1956100 A4

EP 1956100 A4 20111109 - STEEL FOR WARM WORKING, METHOD OF WARM WORKING OF THE STEEL, AND STEEL MATERIAL AND STEEL PART OBTAINED BY THE SAME

Title (en)

STEEL FOR WARM WORKING, METHOD OF WARM WORKING OF THE STEEL, AND STEEL MATERIAL AND STEEL PART OBTAINED BY THE SAME

Title (de)

STAHL ZUM WARMUMFORMEN, VERFAHREN ZUM WARMUMFORMEN DES STAHLS UND DADURCH ERHALTENES STAHLMATERIAL UND STAHLTEIL

Title (fr)

ACIER POUR ÉCROUISSAGE A CHAUD, PROCEDE D'ÉCROUISSAGE A CHAUD DE L'ACIER, ET MATERIAU D'ACIER ET PIECE EN ACIER OBTENUS AVEC LE PROCEDE

Publication

EP 1956100 A4 20111109 (EN)

Application

EP 06833094 A 20061121

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 9/46 (2006.01); C21D 9/52 (2006.01); C22C 38/00 (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 (search report)

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