TOOL STEEL SUITABLE TO DIE FOR ALUMINUM WORKING AND DIE FOR ALUMINUM WORKING

• Main Authors: KATSUMATA KAZUHIKO, SHIMIZU KEISUKE, HARUNA YASUSHI, NOMURA HIROO
• Format: Patent
• Language: English
• Published: 17.12.2009
• Subjects: ALLOYS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

PROBLEM TO BE SOLVED: To provide a tool steel having excellent wear resistance and aluminum erosion resistance in which the coarsening of crystal grains and the precipitation of intergranular carbides caused by carburizing are suppressed, so as to remarkably improve its toughness, and to provide a die for aluminum working. SOLUTION: The tool steel suitable to the die for aluminum working and the die for aluminum working are characterized in that a steel has a composition comprising, by mass, 0.31 to 0.60% C, 0.1 to 0.6% Si, 0.3 to 1.0% Mn, 0.05 to 0.6% Ni, 3.0 to <5.0% Cr, one or two selected from Mo and W so as to satisfy an Mo equivalent (Mo+1/2W): 0.8 to 4.0% and one or two selected from V and Nb so as to satisfy a V equivalent (V+1/2Nb): 0.5 to 1.5%, and the balance Fe with inevitable impurities, and in forging and rolling, end temperature is controlled to 900 to 1,150°C and cooling velocity is controlled to ≥0.05°C/sec. COPYRIGHT: (C)2010,JPO&INPIT