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The notch properties of 43XX-vanadium modified steel containing 0.21, 0.30, 0.41, 0.50, and 0.60 per cent carbon have been measured for several tempered conditions at temperatures from −320 to 85 F. Five per cent chromium steels containing 0.24 and 0.39 per cent carbon heat treated to hardnesses in the Rockwell hardness C 40 to 50 range were likewise tested. In the 43XX-vanadium modified steels reduced carbon content promoted notch toughness. In the 5 per cent chromium steels the reverse effect was observed. The fracture characteristics of the steels are discussed briefly.
Klier, E. P.
Professor of Metallurgy, The Catholic University of America, Washington, D. C.