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Abstract
Behaviours of Zirconium in steel are studied, the follwing effects are recognized: (1) Acm points of high carbon steel are depressed by addition of Zr and Al points are inva-riable by being of Zr. (2) Zr produces the secondary hardening in steel and its effects are accerelated by being togethei of silicon and chromium. (3) Zr makes the austenite grains finer. (4) Zr have ability spheroidizing the cementite in pearlite. (5) Zr makes slow the softening speed on tempering of quenched steel, e.g. Zr have ability in-creasing the retarding effect to tempering.
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