Cr-Nb-Hf-Ac to Lr

Niobium-hafnium alloys, with tungsten, impart high temperature strength and high heat-resistance. Both hafnium and niobium can be alloyed to chromium, but there is little economic incentive to so do with the latter, an exotic metal. A recently developed chromium-niobium alloy shows simultaneous high-temperature resistance to oxygen and sulfur. Both chromium and niobium have a body-centered cubic (bcc) crystal structure.