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Low-silicon stainless steel sheets were rolled 40 per cent at room temperature and heat-treated 24 hr at 800 F. Yield strengths of 240 ksi were obtained in iron-nickel-chromium alloys. Through the use of 7 to 12 per cent cobalt as a supplemental hardener, the yield strengths were increased to 270 ksi. Notch tensile ratios of unity were obtained using NASA-ASTM sheet specimens.
Research associate, International Nickel Co., Sterling Forest, N.Y.
Mayne, C. R.
Product development metallurgist, International Nickel Co., New York, N.Y.