High-hardness powder metallurgy tool steel and article made...

Details High-hardness powder metallurgy tool steel and article made... High-hardness powder metallurgy tool steel and article made...

C - Chemistry, Metallurgy

22

C

C22C 38/36 (2006.01) C22C 33/02 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/22 (2006.01) C22C 38/24 (2006.01) C22C 38/30 (2006.01)

Patent

CA 2359188

A tool steel alloy having a unique combination of hardness and toughness is disclosed. The alloy contains, in weight percent, about: wt.% C 1.85-2.30, Mn 0.15-1.0, Si 0.15-1.0, P 0.030 max., S 0-0.30, Cr 3.7-5.0, Ni+Cu 0.75 max., Mo 1.0 max., Co 6-12, W 12.0-13.5, V 4.5-7.5. The balance is essentially iron and usual impurities. The elements C, Cr, Mo, W, and V are balanced in this alloy such that -0.05 >= .DELTA.C >= -0.42 where .DELTA.C=((0.033W) + (0.063Mo) + ( 0.06Cr) + (0.2V)) - C. A powder metallurgy tool steel article made from consolidated alloy powder having the aforesaid weight percent composition provides a Rockwell C hardness of at least about 69.5 when heat treated.

Cette invention concerne un alliage d'acier à outils, possédant une combinaison unique de dureté et ténacité. L'alliage contient, en pourcentage de poids, environ: <u> % en poids </u> C 1,85-2,30; Mn 0,15-1,0; Si 0,15-1,0; P 0,030 max.; S 0-0,30; Cr 3,7-5,0; Ni+Cu 0,75 max.; Mo 1,0 max.; Co 6-12; W 12,0-13,5; V 4,5-7,5. Le reste correspond essentiellement à du fer et à des impuretés usuelles. La proportion des éléments C, Cr, Mo, W, et V est telle que 0,05 </= DELTA C </= 0,42 où DELTA C=((0,033W) + (0,063Mo) + (0,06Cr) + (0,2V)) - C. Un produit en acier à outils de métallurgie des poudres, fabriqué à partir d'une poudre d'alliage consolidé, de composition en pourcentage de poids mentionnée précédemment, possède une dureté Rockwell C d'au moins environ 69,5 lorsqu'il est traité à chaud.

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