EP 2048257 A4 20121128 - FREE-CUTTING STAINLESS STEEL AND PROCESS FOR PRODUCING THE SAME
Title (en)
FREE-CUTTING STAINLESS STEEL AND PROCESS FOR PRODUCING THE SAME
Title (de)
NICHTROSTENDER AUTOMATENSTAHL UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
ACIER INOXYDABLE DE DECOUPE LIBRE ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- JP 2007065314 W 20070730
- JP 2006208017 A 20060731
Abstract (en)
[origin: EP2048257A1] The present invention relates the free-cutting stainless steel that have not only of excellent machinability but also environment-friendliness and corrosion resistance and excellent mechanical property and methods of manufacturing free-cutting stainless steel. Free-cutting stainless steel produced by adding a free-cutting additive is characterized in that the free-cutting additive thereof is h-BN (hexagonal boron nitride) particles dispersed and precipitated homogeneously in the stainless steel. A method of manufacturing free-cutting stainless steel produced by adding a free-cutting additive is characterized in that free-cutting stainless steel where h-BN particles are precipitated is heated to dissolve the h-BN particles into steel matrix, quenched and subsequently tempered to disperse and precipitate h-BN particles homogeneously again as free-cutting additive or in that free-cutting stainless steel where h-BN particles are precipitated is heated to dissolve the h-BN particles into steel matrix and subsequently subjected to slow cooling to disperse and precipitate h-BN particles homogeneously again.
IPC 8 full level
C22C 38/00 (2006.01); C21C 7/00 (2006.01); C21C 7/04 (2006.01); C21D 1/18 (2006.01); C21D 6/00 (2006.01); C21D 8/00 (2006.01)
CPC (source: EP)
C21D 6/00 (2013.01); C22C 1/1068 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/40 (2013.01); C21D 2211/004 (2013.01)
Citation (search report)
- [A] JP 2003129191 A 20030508 - NISSHIN STEEL CO LTD
- [A] JP 2001329335 A 20011127 - KOBE STEEL LTD
- [A] JP H06145889 A 19940527 - DAIDO STEEL CO LTD
- [A] JP H04365835 A 19921217 - NIPPON STEEL CORP
- See references of WO 2008016158A1
Designated contracting state (EPC)
DE FR SE
DOCDB simple family (publication)
EP 2048257 A1 20090415; EP 2048257 A4 20121128; EP 2048257 B1 20140219; JP 5142289 B2 20130213; JP WO2008016158 A1 20091224; WO 2008016158 A1 20080207
DOCDB simple family (application)
EP 07791987 A 20070730; JP 2007065314 W 20070730; JP 2008527817 A 20070730