3N5 Pure Molybdenum Round Bar
- High purity Mo ≥ 99.95% (3N5 grade) for minimal contamination in critical applications
- High melting point of 2610°C–2620°C for extreme high-temperature service
- Density 10.2 g/cm³ with excellent dimensional stability
- Low coefficient of thermal expansion (5.1×10⁻⁶/K) for high-precision parts
- Excellent thermal conductivity (~138 W/m·K) for efficient heat dissipation
- Good electrical conductivity for electrode and heating element applications
- Available in sintered or forged condition, black or polished surface
Description Of 3N5 Pure Molybdenum Round Bar
3N5 Pure Molybdenum Round Bar is a high-purity refractory metal product manufactured from molybdenum powder through powder metallurgy, sintering, and subsequent thermo-mechanical processing such as forging, swaging, or rolling. The “3N5” designation indicates a purity level of 99.95% minimum (3N = three nines, 5 = fifth nine), making it one of the highest purity grades available for commercial molybdenum rod products. The material is also designated as Grade Mo1 per ASTM B387 and GB/T 4188-2017 standards.
Molybdenum possesses a unique combination of properties that make it indispensable in high-temperature industrial applications. With a melting point of 2610°C–2620°C, a density of 10.2 g/cm³, excellent thermal conductivity (~138 W/m·K), and a low coefficient of thermal expansion (5.1×10⁻⁶/K), molybdenum round bars deliver reliable performance in the most demanding thermal environments. Unlike tungsten, which is significantly denser (19.3 g/cm³) and more expensive, molybdenum offers a favorable balance of high-temperature performance, machinability, and cost-effectiveness.
The manufacturing process begins with high-purity molybdenum powder (Mo ≥ 99.95%), which is pressed into bar blanks and sintered at high temperatures. The sintered bars are then processed through forging, swaging, or rolling to achieve the desired density and mechanical properties. The bars are available in black (as-sintered or as-swaged) or polished/ground surface conditions, with diameters ranging from 0.8mm to 150mm and lengths up to 1500mm.
3N5 pure molybdenum round bars are primarily used in high-temperature furnace heating elements and support rods, semiconductor ion implantation components, glass melting electrodes, and aerospace structural parts.
Features Of 3N5 Pure Molybdenum Round Bar
High Purity (Mo ≥ 99.95%): Ensures minimal contamination in critical applications such as semiconductor manufacturing and medical equipment. Impurity limits are strictly controlled per ASTM B387.
High Melting Point: With a melting point of 2610°C–2620°C, molybdenum round bars maintain stability in extreme high-temperature environments without melting or deformation.
Excellent Thermal Conductivity: Thermal conductivity of approximately 138 W/m·K at 20°C enables efficient heat transfer, making molybdenum ideal for heating elements and heat dissipation applications.
Low Coefficient of Thermal Expansion: With a coefficient of thermal expansion of 5.1×10⁻⁶/K, molybdenum round bars exhibit excellent dimensional stability under thermal cycling.
Good Electrical Conductivity: Molybdenum offers good electrical conductivity (resistivity ~5.7 µΩ·cm at 20°C), suitable for electrode and heating element applications.
High Strength at Elevated Temperatures: Molybdenum maintains good mechanical strength and creep resistance at high temperatures, ensuring structural integrity under sustained thermal loads.
Corrosion Resistance: Molybdenum resists corrosion from most chemical media including acids, alkalis, and salts, and offers excellent resistance to molten glass and many molten metals.
Good Machinability: Molybdenum can be machined using carbide tooling, and is easier to machine than tungsten, enabling precise dimensions and surface finishes.
Available in Multiple Surface Conditions: Black (as-sintered or as-swaged), polished, ground, or chemically cleaned surfaces are available to suit different application requirements.
Specifications Of 3N5 Pure Molybdenum Round Bar
| Parameter | Specification |
|---|---|
| Material | Pure molybdenum (Mo) |
| Grade | Mo1 (3N5) |
| Purity | Mo ≥ 99.95% |
| Density | 10.2 g/cm³ (typical 10.20–10.28 g/cm³) |
| Melting Point | 2610°C – 2620°C |
| Boiling Point | ~5560°C |
| Operating Temperature | 1100°C – 2000°C |
| Thermal Conductivity | ~138 W/(m·K) at 20°C |
| Coefficient of Thermal Expansion | 5.1×10⁻⁶/K |
| Electrical Resistivity | ~5.7 µΩ·cm at 20°C |
| Tensile Strength | 485 – 690 MPa (depending on condition) |
| Yield Strength | 415 – 550 MPa (depending on condition) |
| Hardness (Vickers) | 200 – 250 kgf/mm² |
| Elastic Modulus | ~325 GPa |
| Production Process | Powder metallurgy, sintering, forging/swaging, machining |
| Surface Conditions | Black, polished, ground, chemically cleaned |