Abstract
Using 18% Chromium steels containing 0.03∼0.27%C and 0∼3.26%Ti, several properties were studied. The self hardening property vanishes with the addition of more than 0.25% of titanium, irrespective of carbon , and with further addition of titanium the hardness gradually increases. The temper-hardening is observable in specimens containing more than 2.5% titanium and 10 times carbon content. The grain size of ferrite is refined and its growth at high temperature is retarded with the addition of about 0.25%Ti. One or two kinds of carbide, Cr4C and TiC, are obsevable, according to titanium and carbon contents. Acid-resistivity with conc. boiling HNO3 solution and corrosibility with 3%NaCl solution were tested, Impact resistance markedly increases with the addition of 0.25∼0.50%Ti, irrespective of carbon content and decreases with further addition of titanium.
