| columbium |
a former name for niobium
출처: wordnet.princeton.edu/perl/webwn
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| columbium |
Chemical symbol Co. Refractory metal used as an alloying agent in steel making; essential for high-strength, low-alloy grades. Has some "worked metal" applications, mostly alloyed with zirconium or titanium for aerospace applications. Called Niobium (Nb) everywhere but the US
출처: www.rollformedshapes.com/termsc-f.htm
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