Alloys or metallic compositions – Ferrous – Chromium containing – but less than 9 percent
Patent
1986-09-10
1988-03-08
Rutledge, L. Dewayne
Alloys or metallic compositions
Ferrous
Chromium containing, but less than 9 percent
420106, 420107, 420108, 420109, 420110, 420112, 420114, C22C 3822
Patent
active
047298723
ABSTRACT:
Isotropic tool steel consisting essentially of necessary elements as tool steel, less than 0.005 weight % of S and less than 30 ppm of O, the balance being substantially Fe. The necessary elements are, by weight, 0.10-0.70% of C, 2.00% or less of Si, 2.00% or less of Mn, 7.00% or less of Cr, 0.20-12.00% of W and/or Mo alone or in combination (1/2W+Mo), 3.00% or less of V. They may further include at least one of 4.00% or less of Ni, 6.50% or less of Co and 0.20% or less of N. The isotropic tool steel has cleanliness with respect to non-metallic inclusions defined by JIS G 0555 of dA60.times.400.ltoreq.0.010% and d(B+C)60.times.400.ltoreq.0.020%, and a ratio of transverse direction toughness to longitudinal direction toughness of more than 0.70. Since it is highly resistant to the generation and propagation of cracks and fracture, dies for hot working made therefrom can enjoy a long life.
REFERENCES:
patent: 3602689 (1971-08-01), Heuschkel
patent: 3656943 (1972-04-01), Heusehkel
patent: 4468249 (1984-08-01), Lehman
Kishida Tamiya
Nakao Atsusuke
Okuno Toshio
Suzuki Mitsuru
Hitachi Metals Ltd.
Rutledge L. Dewayne
Wyszomierski George
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