Abstract
1. Heat treatment of steel 45 (austenitizing at 900°, cooling at 30–40 deg/sec to 600–550°, then in air) leads to formation of a dispersed ferritic-pearlitic structure and improvement of the mechanical properties in comparison with the normalized condition. 2. The mechanical properties of steel 45 subjected to cooling interrupted at 600° hardly differ from the properties obtained after quenching and tempering at 600°: σb=74–76 kgf/mm2, σT=46–48 kgf/mm2, σ5=18–21%,a= n +20 =8–10 kgf-m/cm2. 3. Replacing steel "D" with steel 45 having a controlled chemical composition in combination with heat treatment including interrupted cooling makes it possible to increase the yield strength, reduce the safety factor, and thus reduce the weight of tanks.
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