Tool made from alloy steel for severe cold forming

Details Tool made from alloy steel for severe cold forming Tool made from alloy steel for severe cold forming

1980-06-18

1982-03-30

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

C22C 3844, C22C 3854

Patent

active

043222560

ABSTRACT:
An alloy steel having superior ductility and a low rate of work hardening for use in severe cold forming processes to provide products with high static and dynamic strength, the alloy steel consisting essentially of from about 0.28% to about 0.33% by weight carbon, from about 0.25% to about 0.65% by weight manganese, up to about 0.15% by weight silicon, from about 0.0005% to about 0.0035% by weight boron, from about 0.4% to about 0.7% by weight nickel, from about 0.4% to about 0.6% by weight chromium, from about 0.15% to about 0.25% by weight molybdenum, and the remainder being iron with minor amounts of impurities and additional alloying elements; a high strength forged tool made from the alloy steel; and the method of forming high strength forged tools including the steps of providing a solid metal slug of the alloy steel, annealing the metal slug for spheroidization to a hardness in the range R.sub.B 70 to R.sub.B 76, cold forming the annealed metal slug into the final shape of the tool, and thereafter heat hardening the formed tool to a hardness in the range R.sub.C 48 to R.sub.C 52, the annealed yield strength of the alloy steel being about 41,290 PSI and the reduction of area of the alloy steel being about 72%.

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patent: 4061013 (1977-12-01), Kuc

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