The company expects to clinch the deal after a consortium led by a German firm Krauss-Maffei Wegmann failed to participate in final tender negotiations with the Australian Government.
The German firm, in association with BAE Systems Australia , was seeking to supply its PZH-2000 guns.
The Samsung-Raytheon team is offering a modified version of the K-9 weapon.
The K-9, an indigenous all-welded steel armour construction rated to withstand impact by 14.5mm armour piercing shells, has been developed jointly with the state-funded Agency for Defence Development.
The self-propelled artillery system carries a 155mm/52 calibre gun with a maximum firing range of 40km and includes a 1,000-horsepower engine and a hydropneumatic suspension unit.
The government is expected to announce a final bidder as early as September, an official of the Defence Acquisition Programme Administration said.