Abstract
1. The introduction of niobium (0.73%) in 0.03% C steel leads to a reduction from 0.034 to 0.003% in carbon solubility at 1150°C, whereas up to 1.13% C may be contained in the steel at the temperature indicated without alloying additives. With the introduction of titanium, the carbon solubility also decreases and amounts to 0.015% at 1150°C with a total carbon content of 0.06% in the steel. 2. The solubility curve is shifted into the region of high carbon concentrations with increasing total carbon content in the steel alloyed with titanium or niobium. 3. According to results of the computation of the solubility products of titanium and niobium carbides in high-chromium ferrite in the 1150...1350°C interval, niobium carbide is more stable than titanium carbide.
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