BUZZ — Citi maintains 'buy' on shipbuilder Austal, says Hanwha negotiations progressing
* Citi says Austal's extension of the due diligence period for Hanwha Group is incrementally positive for the sale process * The announcement highlights that negotiations with Hanwha have moved beyond due diligence into active commercial negotiations - brokerage * Citi says due diligence appears largely complete, with