발간논문

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Vol.29, No.8, 853 ~ 861, 1991
Title
Improvements of Impact toughness and Castability of Steel by the Addition of Calcium - Silicon
이종수Jong Soo Lee, 이경섭Kyung Sub Lee, 김성만Sung Man Kim, 소찬영Chan Young So
Abstract
Effects of CaSi wire feeding on the impact toughness and the castability of Al-killed steel have been studied in full-scale industrial trials. The steel samples taken from a 40ton VAD vessel were subjected to the tensile and the Charpy impact tests for determining mechanical properties. In addition, the tundish nozzles through which Al-killed and Al-killed and Ca-treated steels had been cast were Xray diffractometrically examined. Calcium treatment of Al-killed steel remarkably increases the impact toughness of steel, which is considered to be due to uniformly distributed globular and small inclusions. In the Ca-added steel, the conversion of alumina into molten calcium aluminate inclusions substantially improves the steel castability. Since the aluminum retention is extremely small, it deems necessary to determine if an improved aluminum deoxidation could be obtained with the A1 wire feeding practice.
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