** Shares of Australian shipbuilder Austal ASB.AX rise 9.7% to A$4.2
** Stock set for strongest trading session since February 21
** Korea's Hanwha 000880.KS has taken a 9.9% stake in ASB, a filing confirms on Tuesday
** Hanwha offers A$4.45 each for 41.2 mln ASB shares
** Offer price represents a 16.2% premium to Austal's closing share price on Monday of A$3.83
** Stock up 31.6% YTD
(Reporting by Rishav Chatterjee in Bengaluru)
((Rishav.Chatterjee@thomsonreuters.com;))