Australian shipbuilder Austal said on Tuesday that Hanwha Group had offered to buy its U.S. operations for up to $1.20 billion as the South Korean conglomerate seeks to expand in the American defence market.Austal shares rose more than 16%, logging their best intraday jump since mid-February.<p><p>https://www.marinelink.com/news/hanwha-makes-b-offer-austal-usa-541970</p></p>