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@Timmy No need to discuss #alumium or #manganese (if you're not familiar with the latter, it's the most common alloying agent in #steel - it's everywhere).

#Cobalt usage has been steadily declining (a couple decades ago it was as high a % as the #nickel), and there's hope it will be entirely eliminated in the coming years - but as for now it's still in use. Cobalt is the most expensive of the metals (offset by its low percentage), which is a major factor driving the work to eliminate it.