HONG KONG, Oct 20 (Reuters) - China has finalised its U.S. dollar bond issuance to raise $4 billion, according to a term sheet seen by Reuters. The pricing for the deal was set at Treasuries plus 6 basis points for the three-year tranche, 12 basis points for five years, 23 basis points for 10 years and 53 basis points for the 30-year tranche. (Reporting by Scott Murdoch in Hong Kong; Editing by Jacqueline Wong) Our Standards: The Thomson Reuters Trust Principles.