Nilo 48 Round Bars, also known as UNS K94800 or Alloy 48, is a nickel-iron controlled-expansion alloy containing roughly 48 percent nickel by weight. Its low coefficient of thermal expansion is engineered to align with that of soft lead and soda-lime glass. It is specified under ASTM F30 (or ASME SF30) and conforms to other international standards such as DIN 17745 and AFNOR NF A54-301. The typical chemical composition includes up to 0.05 % carbon, up to 0.8 % manganese, up to 0.3 % silicon, and a balance of iron, with nickel around 48 %. In the annealed condition, Nilo 48 Round Bars deliver a tensile strength near 520 MPa and yield strength around 250 MPa, with elongation around 43 %.

The alloy also exhibits a linear thermal expansion coefficient in the range of 8.3–9.3 × 10⁻⁶ /°C between 20 °C and 400 °C. Additionally, SMM Industries LLP’s Nilo 48 Round Bars conform to NACE MR0175 / ISO 15156, making them suitable for corrosion-sensitive and sour-service environments.

One of the greatest strengths of Nilo 48 Round Bars is their highly stable thermal expansion behavior, enabling them to match expansion with soda-lime glass or soft lead sealing glasses. This makes it ideal for glass-to-metal sealing applications. Their mechanical strength, combined with good ductility and a high inflection point, allows them to operate under thermal stress and elevated temperature up to about 450 °C.

The alloy also shows excellent dimensional stability across temperature cycles, which is essential for precision engineering. Its magnetic permeability and elastic modulus (~180–190 GPa) make it useful in applications where both expansion control and mechanical stiffness are required. Corrosion resistance is moderate, offering durability in atmospheric and mild chemical environments.

Nilo 48 Round Bars find utility in a range of critical applications where thermal stability and mechanical strength are vital:

• Glass-to-metal sealing: Ideal for creating hermetic seals between glass (especially soda-lime or soft lead types) and metal in electronic devices, sensors, vacuum tubes, or tubes in lighting systems, due to its matching coefficient of expansion.

• Industrial thermostats: Used in thermostat rods and other precision temperature-control components that operate at high temperatures (up to 450 °C), leveraging its stable expansion characteristics.

• Precision instrumentation: In instruments where dimensional stability over temperature cycles is critical, Nilo 48 round bars help maintain calibration and tight tolerances.

• Structural components in glass processing: In glass-processing machinery and fixtures, the alloy helps reduce thermal mismatch stress between supports and the glass being shaped or heated.

• Electronic packaging: Used in packages, feedthroughs, and connectors that require a thermal expansion match to glass or ceramics, ensuring integrity in high-reliability electronics.

In different countries and industry standards, Nilo 48 Round Bars are referred to by a variety of names and designations: in the U.S. as UNS K94800 under ASTM F30, in Europe under DIN 17745 (Werkstoff No. 1.3922 or 1.3926), and under the AFNOR standard NF A54-301. In some markets, it is sold under trade names like Invar 48 or Magnifer 50.

As a leading Nilo 48 Round Bars Manufacturer, SMM Industries LLP ensures precise control over chemical composition, mechanical properties, and dimensional tolerances. We also act as trusted Nilo 48 Round Bars Suppliers and Stockists, maintaining a wide inventory with sizes ranging from 4 mm up to 500 mm in diameter and lengths up to 6 meters or customized. Our global reach qualifies us among prominent Nilo 48 Round Bars Exporters, ensuring consistent quality and on-time delivery.

Under ASTM F30 / ASME SF30, the alloy is designated UNS K94800. In DIN, it corresponds to Werkstoff number 1.3922 / 1.3926 / 1.3927. In AFNOR, it is NF A54-301. Trade names include Nilo 48, Invar 48, and Magnifer 50. SMM Industries LLP’s Nilo 48 Round Bars offer a unique combination of controlled thermal expansion, mechanical reliability, and versatility across critical industrial applications.

With deep expertise in precision alloys, SMM Industries LLP delivers superior quality Nilo 48 Round Bars tailored for demanding industries. Our adherence to international ASTM F30 / UNS K94100 / EN 1.3917 standards ensures that your components perform reliably in high-precision thermal environments. We combine strong inventory, global reach, and responsive service to serve as a comprehensive partner in every step—from manufacturing and stocking to exporting.