Standard Specification for Hafnium and Hafnium Alloy Strip, Sheet, and Plate
This specification covers the standard requirements for two grades of wrought hafnium and hafnium alloy strip, sheet, and plate: Grade R1 for nuclear applications and Grade R3 for commercial applications. The materials shall be made from ingots that are produced in a furnace by vacuum or plasma arc melting, vacuum electron-beam melting, a combination of these three methods, or other melting process conventionally used for reactive metals. The various mill products shall be formed with the conventional extrusion, forging, or rolling equipment normally found in primary ferrous and nonferrous plants. The sheet, strip, and plate shall either be hot-rolled or cold-rolled and shall be supplied in the recrystallized annealed condition. Grades R1 and R3 metal shall conform to the chemical composition requirements for aluminum, carbon, chromium, copper, hydrogen, iron, molybdenum, nickel, niobium, nitrogen, oxygen, silicon, tantalum, tin, titanium, tungsten, uranium, vanadium, zirconium, and hafnium as shall be determined by chemical analysis. Mechanical properties, which shall be determined by tension tests both in longitudinal and transverse direction, shall meet the prescribed tensile strength, yield strength, and elongation requirements. Corrosion testing in water shall also be performed to determine the corrosion resistance of the materials.
1.1 This specification covers two grades of wrought hafnium and hafnium alloy strip, sheet, and plate as follows:
1.1.1 Grade R1 for nuclear applications, and
1.1.2 Grade R3 for commercial applications.
1.2 Unless a single unit is used, for example corrosion mass gain in mg/dm2, the values stated in either inch-pound or SI units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. SI values cannot be mixed with inch-pound values.
1.3 The following precautionary caveat pertains only to the test method portions of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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