BRIEF-Severstal buys remaining 20.2 pct of Lucchini

MOSCOW, March 4 (Reuters) - Severstal:

* Severstal acquires Lucchini family's 20.2 stake in Lucchini SpA

* Russian steel company and Alexei Mordashov acquired majority stake in 2005

* Price of 20.2 pct stake not disclosed

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