Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD FOR STRENGTHENING ALLOY STEEL FOR HOT-WORKING DIE, AND ALLOY STEEL OF HOT-WORKING DIE FOR RESTRAINING GENERATION OF HEAT-FATIGUE CRACK WITH THIS METHOD
Document Type and Number:
Japanese Patent JP2008223122
Kind Code:
A
Abstract:

To provide a method for strengthening an alloy steel for hot-working die, preventing the generation of a heat-fatigue crack.

The alloy steel for hot-working die (e.g. SKD61 steel) using a steel containing 0.32-0.42% C, 0.80-1.20% Si, 0.50% Mn, 0.030% P, 0.020% S, 4.50-5.50% Cr, 1.00-1.50% Mo, 0.30-1.15% V and the balance Fe with inevitable impurities and having 450-520 HV is used to a material to be heated and on this material to be treated, grinding powders having 550-1100 HV, are spouted together with compressed air and thus, a nano-crystallizing structure accompanied with non-lamellar formed structure, is generated on the surface layer near the surface of the material to be treated. Successively, if necessary, nitrogen is diffused on the lower part of the surface layer with a plasma-nitriding.


Inventors:
TAKAGI SHINICHI
KUMAGAI MASAO
SHIMODAIRA EIJI
MIYASAKA YOSHIO
Application Number:
JP2007067387A
Publication Date:
September 25, 2008
Filing Date:
March 15, 2007
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
FUJI WPC KK
KANAGAWA PREFECTURE
FUJI KIHAN KK
International Classes:
C21D7/06; B24C1/10; C21D1/06; C22C38/00; C22C38/24; C23C8/02; C23C8/38; C23C14/06; C23C28/04
Domestic Patent References:
JP2002060845A2002-02-28
JP2007297651A2007-11-15
JPH11152583A1999-06-08
JP2005113161A2005-04-28
JPH10100069A1998-04-21
JPH10217122A1998-08-18
JP2003039398A2003-02-13
JP2004148362A2004-05-27
JP2004219323A2004-08-05
JP2004339532A2004-12-02
JP2000129349A2000-05-09
JP2008207279A2008-09-11
JPH0853711A1996-02-27
JP2001150098A2001-06-05
JP2004202512A2004-07-22
JP2000129349A2000-05-09
JP2001150098A2001-06-05
JP2004202512A2004-07-22
JPH0853711A1996-02-27
JPH10100069A1998-04-21
JPH10217122A1998-08-18
JP2002060845A2002-02-28
JP2007297651A2007-11-15
JPH11152583A1999-06-08
JP2005113161A2005-04-28
JP2003039398A2003-02-13
JP2004148362A2004-05-27
JP2004219323A2004-08-05
JP2004339532A2004-12-02
JP2008207279A2008-09-11
Attorney, Agent or Firm:
Masaaki Ogura



 
Previous Patent: METHOD FOR REPAIRING FURNACE WALL SURFACE AT UPPER PART OF BLAST FURNACE SHAFT

Next Patent: RADICAL GENERATOR