1. Scope
1.1.1 Molybdenum 360ÐUnalloyed vacuum arc-cast molybdenum.
1.1.2 Molybdenum 361ÐUnalloyed powder metallurgy molybdenum.
1.1.3 Molybdenum Alloy 363ÐVacuum arc-cast molybdenum±0.5 % titanium±0.1 % zirconium (TZM) alloy.
1.1.4 Molybdenum Alloy 364ÐPowder metallurgy molybdenum±0.5 % titanium±0.1 % zirconium (TZM) alloy.
1.1.5 Molybdenum 365ÐUnalloyed vacuum arc-cast molybdenum, low carbon.
1.1.6 Molybdenum Alloy 366ÐVacuum arc-cast molybdenum, 30 % tungsten alloy.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information purposes only.
2. Referenced Documents
2.1 ASTM Standards:
E 8 Test Methods for Tension Testing of Metallic Materials2 F 289 Speci®cation for Molybdenum Wire and Rod for Electronic Applications3
3. Terminology
3.1 De®nitions of Terms Speci®c to This Standard:
3.1.1 bar and rodÐany straight product with a round, rectangular, hexagonal, or octagonal solid cross section, 4 in. (101.6 mm) in diameter or less, or of equivalent cross- sectional area.
3.1.2 wireÐany product furnished in coils or on spools or reels. NOTE 1ÐThis speci®cation covers wire no smaller than 0.020 in. (0.51 mm) in diameter or of equivalent cross-sectional area. Speci®cation F 289 covers diameters up to 0.020 in.
4. Ordering Information
4.1 Orders for material under this speci®cation shall include the following information as applicable:
4.1.1 Material number and temper designation (Section 1 and Table 3 ),
4.1.2 Product form (Section 3),
4.1.3 Chemical requirements (Table 1 and Table 2),
4.1.4 Mechanical requirements (Section 7),
4.1.5 Softening temperature (Section 8),
4.1.6 Tolerances (Section 9 and Table 4),
4.1.7 Workmanship and quality level requirements (Section 10),
4.1.8 Packaging (Section 16),
4.1.9 Marking (Section 15),
4.1.10 Certi®cation and reports (Section 14), and
4.1.11 Disposition of rejected material (Section 13).
5. Materials and Manufacture
5.1 The various molybdenum mill products covered by this speci®cation shall be manufactured with the conventional extrusion, forging, swaging, rolling, and drawing equipment normally found in primary ferrous and nonferrous plants. The ingot metal for Molybdenum 360 and 365 and Molybdenum Alloys 363 and 366 is vacuum arc-melted in furnaces of a type suitable for reactive, refractory metals, and for Molybdenum 361 and 364 the metal is consolidated by powder metallurgy methods.
6. Chemical Composition
6.1 The molybdenum and molybdenum alloy ingots and billets for conversion to ®nished products covered by this speci®cation shall conform to the requirements of the chemical composition prescribed in Table 1.
6.2 Check Analysis:
6.2.1 Check analysis is an analysis made by the purchaser or the manufacturer of the metal after it has been processed into ®nished mill forms, and is either for the purpose of verifying the composition of a heat or lot or to determine variations in the composition within a heat or lot.
6.2.2 Check analysis tolerances do not broaden the speci®ed heat analysis requirements but cover variations
between labo-ratories in the measurement of chemical content.
6.2.3 The manufacturer shall not ship material that is outside the limits speci®ed in Table 1 for the applicable type,with the exception of oxygen and nitrogen, whose percentage may vary with the method of fabrication.
7. Mechanical Properties
7.1 Material supplied under this speci®cation shall conform to the mechanical property requirements given in Table 3 when tested in the longitudinal direction of working at test tempera-tures between 65 and 85°F (18.3 and 29.4°C).
7.2 Tension test specimens shall be prepared and tested in accordance with Test Methods E 8. Tensile properties shall be determined using a strain rate of 0.002 to 0.005 in./in.´min (or mm/mm´min) through 0.6 % offset and 0.02 to 0.05 in./in.´min to fracture.
8. Softening Temperature
8.1 If speci®ed, the material supplied under this speci®cation shall have mechanical properties not lower than those shown in Table 3 after reheating in a protective atmosphere to the following temperatures for a period of 30 min;
9. Permissible Variations in Dimensions
9.1 Diameter, and out-of-round tolerances on molybdenum
and molybdenum alloy products covered by this speci®cation
shall be as speci®ed in Table 4.
9.2 Length and straightness tolerances and limitations shall
be as follows:
9.2.1 Cut lengths, 6 1¤4 in. (6.35 mm).
9.2.2 Straightness, maximum deviation of 0.050 in./ft (1.27 mm/305 mm) in any length.
9.3 Permissible variations in dimensions for wire, square,
or rectangular bars, and hexagonal or octagonal rods, shall be as agreed upon between the manufacturer and the purchaser.
10. Workmanship, Finish, and Appearance
10.1 Molybdenum and molybdenum alloy bar, rod, and wire shall be free of injurious external and internal
imperfections of a nature that will interfere with the purpose for which it is intended.
10.2 Material may be ®nished as forged, rolled, swaged, or drawn (black), as cleaned, as machined, or as ground.
10.3 The manufacturer shall be permitted to remove surface imperfections provided such removal does not reduce the dimension below the minimum permitted by the tolerance for
the dimension speci®ed.
11. Sampling
11.1 Care shall be exercised to ensure that the sample selected for testing is representative of the material and form and is not contaminated by the sampling procedure.
12. Methods of Chemical Analysis
12.1 The chemical composition enumerated in this speci®- cation shall, in case of disagreement, be determined in accor- dance with the test methods approved for referee purposes by ASTM.4 Where such test methods are not available, methods of analysis as mutually agreed upon between the manufacturer and the purchaser shall be employed.
