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This is something I am interested in applying in my timeline down the road... perhaps by 1500 BCE or even earlier. However, I’m not as versed in metallurgy as I would like to be, as the linguistic/anthropological aspects of my timeline take up a LOT of research time.

If I’m not mistaken, cupromanganese is harder than bronze, but is it more ductile and does it corrode? Does it need to be cast or can it be forged?

Also, where are the primary deposits of the specific manganese ores best suited for the production of cupromanganese? I know that there are some in Ukraine and Kazakhstan, and a whole lot more in China and India. What would be the long term economic effects of a switch from bronze to cupromanganese between 1700-1400 BCE?
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