Resistance of Variously Chemically Balanced 18-8 Stainless Steels in Various Conditions of Hardness to Perforation by Flak-Simulating Projectiles
WATERTOWN ARSENAL LABS MA
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As part of a general program of development of body armor component materials, tests have recently been conducted at this arsenal on three different chemically balanced 18-8 type 302 stainless steels in 14 hard, 12 hard and full hard tempers. Increasing the nickel content from 7 to 9.5 brought about an increase in yield strength and a decrease in elongation whereas the tensile strength remained substantially unaffected. These lower elongation values are reflected in a generally inferior resistance to perforation exhibited by the steels containing greater amounts of nickel. However, the resistance of even the best of these steels is considerably inferior to that of Hadfield manganese steel of equivalent weight.