Deep hardening steel article having improved fracture toughness

Details Deep hardening steel article having improved fracture toughness Deep hardening steel article having improved fracture toughness

1991-07-02

1992-07-21

Yee, Deborah

Metal treatment

Stock

Ferrous

420110, C22C 3822, C22C 3828

Patent

active

051319659

ABSTRACT:
A deep hardening steel has a composition comprising, by weight, about 0.26% to 0.37% carbon, about 0.5% to 1.0% manganese, about 1.0% to 3.0% silicon, about 1.5% to 2.5% chromium, about 0.3% to 1.0% molybdenum, from 0.05% to 0.2% vanadium, from 0.03% to 0.1% titanium, from 0.01% to 0.03% aluminum and at least 0.005% nitrogen. Also, the composition preferably contains less than about 0.025% each of phosphorus and sulfur. After quenching and tempering, articles made of this material are substantially free of aluminum nitrides, have a fine grained microstructure, and a combination of high hardness and fracture toughness.
The deep hardening steel article embodying the present invention is particularly useful for ground engaging tools that are subject to breakage and abrasive wear at high temperature.

REFERENCES:
patent: 3431101 (1969-03-01), Kunitake et al.
patent: 4790977 (1988-12-01), Daniels et al.

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