ASTM B387 Specification

This specification covers unalloyed molybdenum and molybdenum alloy bar, rod, and wire as follows: Molybdenum 360—Unalloyed vacuum arc-cast molybdenum. Molybdenum 361—Unalloyed powder metallurgy molybdenum. Molybdenum Alloy 363—Vacuum arc-cast molybdenum–0.5 % titanium–0.1 % zirconium (TZM) alloy. Molybdenum Alloy 364—Powder metallurgy molybdenum–0.5 % titanium–0.1 % zirconium (TZM) alloy. Molybdenum 365—Unalloyed vacuum arc-cast molybdenum, low carbon. Molybdenum Alloy 366—Vacuum arc-cast molybdenum, 30 % tungsten alloy. 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.

Chemical Composition


Element
Composition, %
Material Number
360 361 363 364 365 366
C 0.030 max 0.010 max 0.010 – 0.030 0.010 – 0.040 0.010 max 0.030 max
O, maxA 0.0015 0.0070 0.0030 0.030 0.0015 0.0025
N, maxA 0.002 0.002 0.002 0.002 0.002 0.002
Fe, max 0.010 0.010 0.010 0.010 0.010 0.010
Ni, max 0.002 0.005 0.002 0.005 0.002 0.002
Si, max 0.010 0.010 0.010 0.010 0.010 0.010
Ti ... ... 0.40–0.55 0.40–0.55 ... ...
W ... ... ... ... ... 27–33
Zr ... ... 0.06–0.12 0.06–0.12 ... ...
Mo balance balance balance balance balance balance
Note:

A. Pending approved methods of analysis, deviations from these limits alone shall not be cause for rejection.

Mechanical Properties for Round Bars and RodsA

Type TemperB Diameter, in. (mm) Tensile Strength, min, ksi (MPa) Yield Strength, 0.2 % Offset, min, ksi (MPa) Elongation in 1 in. (50 mm) min, % Diamond Pyramid Hardness (DPH), Vickers-10 kg
360,361, 365 SR 0.020 to 1⁄8 (0.51 to 3.18),incl 85 (585) 65 (450) 15C ...
over 1⁄8 to 13⁄32 (3.18 to 10.32) 75 (515) 55 (380) 15 ...
over 13⁄32 to 7⁄8 (10.32 to 22.2) 90 (620) 75 (515) 18 230 to 280
over 7⁄8 to 1 1⁄8 (22.2 to 28.6) 85 (585) 70 (480) 15 225 to 270
over 1 1⁄8 to 1 7⁄8 (28.6 to 47.6) 75 (515) 65 (450) 10 215 to 260
over 1 7⁄8 to 2 7⁄8 (47.6 to 73.0) 70 (480) 60 (415) 10 210 to 250
over 2 7⁄8 to 3 1⁄2 (73.0 to 88.9) 65 (450) 55 (380) 10 205 to 240
363, 364 SR 3/16 to 7⁄8 (4.76 to 22.2),incl 115 (790) 100 (690) 18 260 to 320
over 7⁄8 to 1 1⁄8 (22.2 to 28.6) 110 (760) 95 (655) 15 250 to 310
over 1 1⁄8 & to 1 7⁄8 (28.6 to 47.6) 100 (690) 85 (585) 10 245 to 300
over 1 7⁄8 to 2 7⁄8 (47.6 to 73.0) 90 (620) 80 (550) 10 240 to 290
over 2 7⁄8 to 3 1⁄2 (73.0 to 88.9) 85 (585) 75 (515) 5 235 to 285
366 SR 3⁄16 to 7⁄8 (4.76 to 22.2),incl 95 (655) 80 (550) 5 240 to 300
over 7⁄8 to 1 1⁄8(22.2 to 28.6) 90 (620) 75 (515) 4 235 to 300
over 1 1⁄8 & to 1 7⁄8 (28.6 to 47.6) 85 (585) 70 (480) 3 230 to 290
over 1 7⁄8 to 2 7⁄8 (47.6 to 73.0) 80 (550) 65 (450) 3 230 to 290
over 2 7⁄8 to 3 1/2 (73.0 to 88.9) 75 (515) 60 (415) 2 225 to 290
360 RX Under 2 (50.8) 60 (415) 35 (240) 20 200 max
2 to 3 1/2 (50.8 to 88.9) 55 (380) 25 (170) 20 200 max
363, 364 RX Under 2 (50.8) 80 (550) 55 (380) 20 215 max
2 to 3 1/2 (50.8 to 88.9) 75 (515) 45 (310) 10 215 max
Note:

A. Mechanical properties of all bars, and rods other than round, shall be as agreed upon between the manufacturer and the purchaser.
B. SR = stress-relieved; RX = essentially fully recrystallized.
C. The gage length is 10 in. (254 mm) for rods 0.020 to 1⁄8 in. (0.51 to 3.18 min) in diameter only. All other elongation values are for 1-in. (25-mm) gage lengths.