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29,000 hits on Google for 'powder metallurgy', but only 29 for 'powder metallurgy plant' plus 173 for 'powder metallurgy factory.' This compares to 21 for 'metal powder plant' and nine for 'metal powder factory.' It seems that both versions are possible. I personally prefer Oleg's version for the plant/factory, and 'powder metallurgy' for the branch of industry.