Cobalt karfe ne mai wuya, mai kyalli, launin toka mai tsayi mai tsayi (1493°C). Ana amfani da Cobalt musamman wajen samar da sinadarai (kashi 58), superalloys don injin turbin gas da injunan jirgin jet, ƙarfe na musamman, carbides, kayan aikin lu'u-lu'u, da maganadiso. Ya zuwa yanzu, babban mai samar da cobalt shine ...
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