• Proceedings of the KSME Conference
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• 2003.04a
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• pp.72-77
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• 2003

In order to develop ASTM A302 grade C type steel plate with excellent weldability, several steels with different chemistry have been manufactured and evaluated their mechanical properties and weldability. Trial A302-C steels have revealed tensile strength in the range of $61-67kg/mm^2$ and elongation in the range of $27{\sim}32%$, depending on chemical compositions within the ASTM specification range. In case of impact toughness, trial steels showed in the range of 58-70J at $0^{\circ}C$. From the weldability test, the minimum preheat temperature was found to be about $150^{\circ}C$, and automatic welding condition satisfied the requirements of both ASTM specification and users.