Furnace Parts High Temp Resistance Molybdenum Bolts
- High-purity Mo ≥ 99.95% or TZM alloy for extreme high-temperature service
- Melting point 2623°C; continuous operating temperature up to 1800°C in vacuum/inert gas
- Excellent high-temperature strength and creep resistance
- Low coefficient of thermal expansion for dimensional stability
- Good corrosion resistance against molten metals, acids, and alkalis
- Non-magnetic and non-toxic
- Available as hex bolts, socket head cap screws, studs, nuts, washers, and custom shapes
Description Of Furnace Parts High Temp Resistance Molybdenum Bolts
Furnace Parts High Temp Resistance Molybdenum Bolts are precision fasteners manufactured from high-purity molybdenum (Mo1 grade, purity ≥99.95%) or molybdenum alloys such as TZM (Mo-0.5Ti-0.1Zr-0.02C) and MoLa (lanthanum-doped molybdenum). These bolts are specifically designed for use in high-temperature furnace environments, including vacuum furnaces, hydrogen furnaces, sintering furnaces, and sapphire crystal growth furnaces, where conventional steel or stainless steel fasteners would fail due to softening, oxidation, or creep.
Molybdenum offers a unique combination of properties that make it indispensable for high-temperature fastening applications. With a melting point of 2623°C (the third-highest among all elements, after tungsten and tantalum), molybdenum bolts maintain their mechanical strength and dimensional stability at operating temperatures up to 1800°C in vacuum or inert gas atmospheres. The material also offers a low coefficient of thermal expansion (5.1×10⁻⁶/K), excellent thermal conductivity, and good corrosion resistance against many molten metals, acids, and alkalis.
The manufacturing process begins with high-purity molybdenum powder, which is pressed, sintered, and then processed through forging, swaging, or rolling to achieve the desired density and mechanical properties. The bolts are then precision-machined to the required thread form, head style, and dimensions. TZM and MoLa alloys are available for applications requiring higher creep resistance or improved high-temperature strength.
Molybdenum bolts are available in a wide range of sizes and configurations, including hex bolts, socket head cap screws, studs, nuts, washers, and custom-shaped fasteners. They can be manufactured to metric (M3–M30) or inch (UNC/UNF) thread standards, with custom dimensions available upon request.
Features Of Furnace Parts High Temp Resistance Molybdenum Bolts
High Purity: Manufactured from Mo1 grade molybdenum with purity ≥99.95%, ensuring minimal contamination in critical high-temperature applications.
High Melting Point: Melting point of 2623°C enables continuous operation at temperatures up to 1800°C in vacuum or inert gas atmospheres.
Excellent High-Temperature Strength: Molybdenum bolts maintain high tensile strength and creep resistance at elevated temperatures, ensuring reliable clamping force and structural integrity.
Low Coefficient of Thermal Expansion: With a coefficient of thermal expansion of 5.1×10⁻⁶/K, molybdenum bolts exhibit excellent dimensional stability under thermal cycling.
Good Thermal Conductivity: Thermal conductivity of approximately 138 W/(m·K) enables efficient heat transfer, reducing thermal gradients and thermal stress.
Corrosion Resistance: Molybdenum resists corrosion from most chemical media and offers excellent resistance to molten glass and many molten metals.
Non-Magnetic: Molybdenum is non-magnetic, making it suitable for applications where magnetic interference must be avoided.
Good Machinability: Molybdenum can be machined using carbide tooling, enabling precise thread forms, head styles, and dimensions.
Available in Multiple Alloys: Available in pure Mo (Mo1), TZM, and MoLa alloys to suit different high-temperature and creep-resistance requirements.
Customizable: Available in various head styles, thread forms, and sizes. OEM & ODM services available.
Specifications Of Furnace Parts High Temp Resistance Molybdenum Bolts
| Parameter | Specification |
|---|---|
| Material | Pure molybdenum (Mo1), TZM alloy, MoLa alloy |
| Purity | Mo ≥ 99.95% |
| Density | 10.2 g/cm³ |
| Melting Point | 2623°C |
| Operating Temperature | Up to 1800°C (vacuum/inert gas); up to 2000°C short-term |
| Tensile Strength | 600 – 800 MPa |
| Yield Strength | 500 – 700 MPa |
| Hardness (HRB) | 300 – 350 |
| Coefficient of Thermal Expansion | 5.1×10⁻⁶/K |
| Thermal Conductivity | ~138 W/(m·K) at 20°C |
| Thread Standards | Metric (M3–M30), UNC, UNF, BSP, custom |
| Head Styles | Hex, socket head, button head, flat head, custom |
| Bolt Types | Hex bolts, socket head cap screws, studs, nuts, washers |
| Surface Finish | Bright, polished, pickled |
| Standard Compliance | ASTM B387 |