Florin Zalomir, ranked only 39th, was Romania's hero as they defeated favourites Russia 45-43 in the last four.
He was up against world number two Alexey Yakimenko in the final three-minute bout and secured a 5-4 win.
In the other semi-final, the Koreans overcame Italy, bronze medallists in Beijing and runners-up in Athens, 45-37.
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