Low-Alloy, High-Impact-Toughness Steel

USAF-96 Steel is a low-alloy steel that, when thermally processed with the method described here, has the following typical values: an ultimate tensile strength of 245 ksi, yield strength at 0.2% offset of 187 ksi, elongation to failure of 13%, and an impact toughness as measured with a Charpy V-notch test at -40 °C of 30 ft-lb. Of particular benefit is the through hardenability and toughness, which has demonstrated strength and toughness at -40 °C, even with sections up to 4” thick.