Houston-based USA company George Metals is an established producer and supplier of Nilo Alloy 48 rods and bars, providing high-quality nickel–iron products for stringent thermal control needs. Made according to global standards like ASTM F30, the bars and rods are renowned for their accurate thermal expansion characteristics and superb dimensional stability. George Metals offers Nilo 48 in a range of sizes, tolerances, and finishes to match the exact requirements of electronics, aerospace, instrumentation, and industrial sealing industries. With top-quality processing, rigorous quality inspection, and prompt delivery, George Metals is a reliable supplier of high-performance alloy solutions.
Nilo Alloy 48 rods and bars are made of about 48% nickel and the balance iron with slight additions of manganese (≤0.80%), silicon (≤0.30%), carbon (≤0.05%), and trace impurities such as chromium, aluminum, phosphorus, and sulfur. This material has a low, consistent coefficient of thermal expansion of about 8.3–9.3 µm/m·°C (20–300 °C) that is ideal for glass-to-metal sealing and parts where dimensional stability is necessary. Mechanical properties in the as-annealed state are tensile strength ~520 MPa, yield strength ~260 MPa, and elongation ~43%. Nilo 48 has a stable structure over temperature fluctuations and provides adequate workability and machinability.
| Grade | C | Mn | P | S | Si | Ni | Cr | Fe |
| Nilo Alloy 48 | 0.05 max | 0.80 max | 0.025 max | 0.025 max | 0.030 max | 48 | 0.250 max | Bal |
| Material | Condition | Tensile Strength | Yield Strength (0.2% Offset) | Elongation (%) | ||
| psi | MPa | psi | MPa | |||
| Alloy 48 | Annealed | 71,000 | 520 | 38,000 | 250 | 43 |
| STANDARD | WERKSTOFF NR. | UNS |
| Nilo Alloy 48 | – | K94800 |






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George Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Houston, USA
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