ASTM B708 Tantalum Alloy Plate

1. annealed material, n - plate, sheet, or strip that has been annealed.

2. annealed, noun--The act of heat treatment to soften plate, sheet, or strip.

3. sheet, n--a flat product more than 0.1853 inches (4.7 mm) thick.

4. sheet, n-a flat product 6 inches (152.4 mm) or more in width and 0.005 inches (0.13 mm) to 0.1875 inches (4.76 mm) thick.

5. strip, n-flat product, which may be supplied in rolls, in widths of 6 inches (152.4 mm) or less and in thicknesses of 0.005 inches (0.13 mm) to 0.1875 inches (4.76 mm).

This specification covers the standard requirements for tantalum and tantalum alloy plate, sheet, and strip in the following grades: R05200, R05400, R05255, R05252, and R05240. The various tantalum mill products covered by this specification shall be formed with the conventional extrusion, forging, and rolling equipment normally available in metal working plants. Materials shall be made from vacuum-arc or electron-beam melted ingots or powder metallurgy consolidated unalloyed tantalum and shall be supplied in the annealed condition. Chemical analysis shall be conducted to determine the chemical composition of the materials which shall conform to the requirements for carbon, oxygen, nitrogen, hydrogen, iron, molybdenum, niobium, nickel, silicon, titanium, tungsten, and tantalum. The mechanical properties of the materials shall also meet the specified tensile strength, yield strength, and elongation limits as shall be determined by a longitudinal or transverse tension test method.

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