Abstract
Compositional modifications have been made to the existing Cr−Mo−Co stainless steels to produce a steel (alloy B) which combines the high strength of AFC 77 with the toughness of AFC 260. This has been achieved by utilizing both the strengthening effect of grain refinement and the crack stopping ability of retained austenite. After tempering at 800° to 900°F alloy B possesses higher elongation than other high strength stainless steels due to the ease with which its retained austenite transforms under stress to martensite to delay necking. An explanation has been advanced for the anomalously low tensile yield strength that occurs in both alloy B and AFC 77 after tempering at 1000°F.
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