Nilo K Wires

A nickel-iron-cobalt controlled-expansion alloy containing 29% nickel. Its coefficient of expansion, which decreases with rising temperature to the inflection point, matches the expansion rate of borosilicate glasses and alumina ceramics. Used for glass-to-metal seals in applications requiring high reliability or resistance to thermal shock. Examples include: high-power transmitting valves, transistor leads and headers, integrated-circuit lead frames and photography flash bulbs.STANDARD PRODUCT FORMSTube, sheet and round bar.MAJOR SPECIFICATIONSUNS K94800, ASTM F 30, DIN 17745, Werkstoff Nr. 1.3922, 1.3926, 1.3927 LIMITING CHEMICAL COMPOSITION, %Ni ....................29 aFe ....................53 aCo ....................17 aC ..........0.04 max.Mn .......0.50 max.Si .........0.20 max.Al .........0.10 max.Cr .........0.20 max.Mg .......0.10 max.Zr .........0.10 max.Ti..........0.10 max.Cu........0.20 max.Mo .......0.20 max.a Nominal value; adjusted to meet expansion requirements.PHYSICAL CONSTANTS AND THERMAL PROPERTIESDensity, Ib/in3 ........................................................................0.295g/cm3 .........................................................................8.16Melting Temperature (Approximate), °F ........................2640°C ........................1450Inflection Point, °F ..................................................................840°C ..................................................................450Thermal Conductivity, Btu • in/ft2 • h • °F ...........................116W/m • °C ..........................................16.7Coefficient of Expansion, 68 – 212°F, 10-6 in/in • °F........3.320 – 100°C, µm/m • °C ............6.068 – 752°F, 10-6 in/in • °F ..............2.6 – 2.920 – 400°C, µm/m • °C ...................4.6 – 5.2Electrical Resistivity, ohm • circ mil/ft ...............................260µ Ω• m ..............................................0.430TYPICAL MECHANICAL PROPERTIES(Annealed)Tensile Strength, ksi ..................................................................75MPa ............................................................520Yield Strength (0.2% Offset), ksi ...........................................49MPa .....................................340Elongation, % ..............................................................................42