George Metals, based in Houston, USA, is a well-known supplier and manufacturer of Nilo Alloy K bars and rods, or Kovar (UNS K94610). They are precision-crafted for controlled thermal expansion and glass-to-metal sealing applications. Produced to ASTM F15 standards, George Metals can provide the products in varying lengths, diameters, and finishes to meet industry requirements. George Metals, with emphasis on quality, close tolerances, and quick turnaround, supplies critical industries including aerospace, electronics, medical devices, and telecommunications throughout North America with reliable delivery and technical assistance.
Nilo K alloy bars and rods contain around 29% nickel, 17% cobalt, and iron in balance, trace amounts of manganese (≤0.50%), silicon (≤0.20%), and carbon (≤0.04%). This novel combination makes the thermal expansion of the alloy closely comparable to that of ceramics and borosilicate glass. Mechanical properties in the as-annealed state are tensile strength of approximately 520 MPa, yield strength of approximately 340 MPa, and elongation ≥42%. Nilo K has a very low coefficient of thermal expansion (≈4.6–5.2 µm/m·°C within 20–400 °C) and superior dimensional stability, and therefore it is particularly suited for high-reliability thermal applications and precision sealing.
| Grade | C | Mn | Co | Ti | Si | Ni | Cr | Fe | Cu | Mo |
| Nilo Alloy K | 0.04 max | 0.50 max | 17.0 | 0.10 max | 0.20 | 29.0 | 0.20 max | 53.0 | 0.20 max | 0.20 max |
|
Properties |
Metric |
Imperial |
|---|---|---|
|
Tensile strength |
520MPa |
75.4 ksi |
|
Yield strength |
340 MPa |
49.3 ksi |
|
Modulus of elasticity |
130 GPa |
18900 ksi |
| STANDARD | WERKSTOFF NR. | UNS |
| Nilo Alloy K | – | K94610 |






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