ASTM B387 Molybdenum and Molybdenum Alloy Bar and Wire
- Type: Bar and Wire
- Mo 360—Unalloyed VAC Mo
- Mo 361—Unalloyed P/M Mo
- Mo Alloy 363—VAC Mo-0.5Ti-0.1Zr (TZM) alloy
- Mo Alloy 364—P/M Mo-0.5Ti-0.1Zr (TZM) alloy
- Mo 365—Unalloyed VAC Mo, Low carbon
- Mo Alloy 366—VAC Mo-30W alloy
ASTM B387/B387M Molybdenum and Molybdenum Alloy Bar and Wire
Golden Sunbird Metals proudly supplies premium ASTM B387 Molybdenum Bar, Rod & Wire in Grades 360–366, engineered to deliver unmatched performance in the most demanding high-temperature and corrosive environments. Manufactured in full compliance with ASTM B387/B387M, our molybdenum products combine exceptional purity, high melting point (>2,600°C), superior high-temperature strength, excellent creep resistance, and outstanding thermal conductivity. Available in both unalloyed and advanced alloy formulations—including Grade 360 and 361 (unalloyed molybdenum), Grade 365 (low-carbon unalloyed), TZM Alloys 363 and 364 (titanium-zirconium strengthened), and Grade 366 (30% tungsten alloy)—these bars, rods, and wires are offered in stress-relieved or recrystallized conditions, with black or chemically cleaned surface finishes. Supplied in straight lengths or coils (wire ≥0.020 in. diameter), they provide excellent machinability and fabrication versatility for precision components. Ideal for critical applications such as glass melting electrodes, high-temperature furnace heaters and structural parts, vacuum device supports, thermal spray coatings, lighting electrodes, and aerospace or nuclear components, our ASTM B387 molybdenum bar, rod, and wire ensure long service life and reliable performance where other metals fail. Backed by Mill Test Certificates (EN 10204 3.1/3.2) and optional third-party inspection, Golden Sunbird Metals delivers consistent quality, competitive pricing, and fast global delivery. Request a quote today for custom sizes, tolerances, or full traceability on your next molybdenum project.
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.
ASTM B387/B387M Molybdenum and Molybdenum Alloy Bar and Wire Chemical Composition (wt.%)
| Element | 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 | 0.0015 | 0.007 | 0.003 | 0.03 | 0.0015 | 0.0025 |
| N | 0.002 | 0.002 | 0.002 | 0.002 | 0.002 | 0.002 |
| Fe | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| Ni | 0.002 | 0.005 | 0.002 | 0.005 | 0.002 | 0.002 |
| Si | 0.01 | 0.01 | 0.01 | 0.005 | 0.01 | 0.01 |
| 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 |
ASTM B387 Molybdenum and Molybdenum Alloy Bar and Wire Mechanical Properties
| Type | Temper | Diameter Range (in.) | Tensile Strength (min ksi) | Yield Strength 0.2% Offset (min ksi) | Elongation in 1 in. (50 mm) min % | Hardness (Vickers-10 kg) |
| 360, 361, 365 | SR | Various | 65-85 | 55-65 | 10-18 | 205-280 |
| 363, 364 | SR | 3/16 to 3 1/2 | 85-115 | 75-100 | 5-18 | 235-320 |
| 366 | SR | 3/16 to 3 1/2 | 75-95 | 60-80 | 2-5 | 225-300 |
| 360 | RX | Under 2 to 3 1/2 | 55-60 | 25-35 | 20 | 200 max |
| 363, 364 | RX | Under 2 to 3 1/2 | 75-80 | 45-55 | 10-20 | 215 max |
SR = Stress-relieved, RX = Essentially fully recrystallized.
Features
- ASTM B387/B387M molybdenum and molybdenum alloy bar, rod, and wire, supplied in straight lengths or coil form depending on product type.
- Available grades include Mo 360, Mo 361, Mo 363 (TZM), Mo 364 (TZM), Mo 365, and Mo 366 (Mo-30W).
- High melting point, excellent high-temperature strength, and good creep resistance for demanding furnace service.
- Suitable for stress-relieved or recrystallized conditions, depending on size and grade requirements.
- Good machinability and fabrication performance for precision components and custom processing.
- Available with black or chemically cleaned surface finish, with Mill Test Certificate and third-party inspection options.
Technical Specifications
| Specification | Value |
| Standard | ASTM B387 Molybdenum and Molybdenum Alloy Bar, Rod, and Wire |
| Grade | Molybdenum 360, Molybdenum 361, Molybdenum Alloy 363, Molybdenum Alloy 364, Molybdenum 365, Molybdenum Alloy 366 |
| Condition & Finish | Furnished in the wrought and stress-relieved condition; Black, chemical cleaned |
| Type | Bar, Rod, Wire |
| Bar and Rod | Any 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. |
| Wire | Any product furnished in coils or on spools or reels. This specification covers wire no smaller than 0.020 in. (0.51mm) in diameter or equivalent cross-sectional area. Specification F289 covers diameters up to 0.020 in. |
| Inspection Certificate | EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection) |
| Test | Tensile Test |
Applications
- Glass melting electrodes and other molten-glass contact components.
- High-temperature furnace parts such as heaters, supports, structural fixtures, and hot-zone components.
- Molybdenum wire for lighting, electrodes, probe pins, and high-temperature furnace assemblies.
- Thermal spray wire and rod for wear-resistant and friction-control coatings.
- Mandrels, cores, and other metal-forming tools that require strength at elevated temperature.
- High-temperature electronic and vacuum-device supports, grids, and related precision parts.
