This specification covers high strength, cold drawn or cold rolled steel wire with rectangular cross-section and round mill edge. The wire is intended for use in pre-stressed vessel and press frame windings. The steel shall be manufactured by basic oxygen, electric furnace, or vacuum induction processes and produced as ingot cast or continuous cast. Materials shall be tested for contents of carbon, manganese, phosphorus, sulphur, and silicon. A tension tests shall also be performed to evaluate mechanical properties conformance. Guidelines for workmanship, finish, and appearance are stated, as well as the inspection, certification of reports, packaging, marking, and loading for shipment.