STX Heavy Industries Co., one of South Korea’s leading shipbuilders, said Tuesday that it has obtained a 105.7 billion won (US$99.5 million) order to build a gas treatment plant in eastern Iraq.STX Heavy will complete the plant in the Garraf oil fields by November 2015 in a deal with Petronas Carigali Iraq Holding B.V., it said, according to South Korea’s new agency Yonhap.