ASTM B777 CLASS 4 Powder
Elmet Technologies specializes in producing ASTM B777 Class 4 Powder, the densest of the four classes defined by ASTM B777. This high-density material offers a significant advantage over pure tungsten, which is easier to produce and machine, making it an ideal choice for manufacturers. Class 4 powder is commonly used in demanding applications, such as X-ray and radiation shielding, due to its superior density and performance characteristics.
Our Class 4 products are composed of pure tungsten (W) combined with a binder of nickel (Ni) and iron (Fe). Manufacturers typically press and sinter the powder to create high-quality tungsten heavy alloy blocks, rods, or custom-shaped parts, with additional machining as needed. Class 4 powder delivers exceptional density, twice that of steel and greater than most nickel-based superalloys, making it perfect for projects demanding strength and precision.
Benefits of ASTM B777 Class 4 Powder
- Superior density and environmental benefits compared to lead, making it ideal for radiation shielding.
- Outstanding vibration dampening and balance weight capabilities.
- Exceptional suitability for applications requiring ultra-high density.
- Widely utilized in defense industries, due to its unique combination of yield strength, elongation, and density.
- Excellent absorption of gamma rays and X-rays, ensuring reliability in shielding applications.
Technical Data: Material SPecifications
| Grade | Units | K1850 | ET97 |
| Tungsten content, Nominal | % | 97 |
| Density, Nominal | (g/cm3) | 18.5 |
| (lb/in3) | 0.67 | |
| Hardness | (Rc) | ≤ 35 |
| Ultimate Tensile Strength | (ksi) | ≥ 100 |
| (N/mm2) = Mpa | ≥ 689 | |
| Yield Strength | (ksi) | ≥ 75 |
| (N/mm2) = Mpa | ≥ 517 | |
| Elongation | (%) | ≥ 2 |
| Modulus of Elasticity | (psi x 106) | 50 |
| (kN/mm2) | 345 | |
| Magnetic Properties | slight | |
| Magnetic Permeability | (µ) | > 1.05 |
| Thermal Expansion Coefficient | (x10-6/K)(20°C-500°C) | 4.8 |
| Thermal Conductivity | (cgs) | 0.26 |
| Electrical Conductivity | (% IACS) | 16 |
| AMS-T-21014, MIL-T-210014 | Class 4 | |
| ASTM B777 | Class 4 | |
| AMS 7725 | Class 4 Type 2 | |
| Nominal Chemical Composition | Ni content % Fe content % Cu content % Co content % W content % | 1.25 | 2.1 1.25 | 0.9 – | – – | – 97.5 | 97.0 |
Custom Solutions for Your Needs
At Elmet Technologies, we understand that every application is unique. That’s why we offer customizable solutions for our tungsten heavy alloy products. Whether you need specific formulations, tailored geometries, or unique performance characteristics, our team works closely with you to develop the exact solution your project requires.