NILO 48 Alloys

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication
     Cold working
     Annealing
Applications

Introduction

NILO is a binary alloy of nickel-iron, in which the amount if nickel is varied. NILO alloys are categorized as controlled-expansion alloys.

Controlled expansion alloys are those alloys that exhibit a low expansion coefficient (in low and high temperature ranges), good ductility and toughness. These alloys also exhibit good mechanical properties.

NILO alloys are classified as NILO 36, NILO 42, NILO 48 and NILO alloy K, based on the amount of nickel content. NILO 48 alloy consists of 48% nickel and has a coefficient of thermal expansion similar to that of soft lead and soda-lime glasses. The inflection point of this alloy is very high. NILO 48 alloy is available in the form of round, flats, tube, strip and wire.

This datasheet will look into the chemical composition, properties and applications of NILO 48 alloy.

Chemical Composition

The chemical composition of NILO 48 alloy is given in the following table.

Element Content (%)
Iron, Fe 49
Nickel, Ni 48
Others Remainder

Physical Properties

The following table discusses the physical properties of NILO 48 alloy.

Properties Metric Imperial
Density 8.20 gm/cm3 0.296 lb/in3

Mechanical Properties

The mechanical properties of NILO 48 alloy after annealing are tabulated below.

Properties Metric Imperial
Tensile strength 520MPa 75.4 ksi
Yield strength 260 MPa 37.7 ksi
Modulus of elasticity 160 GPa 23200 ksi

Other Designations

Some of the other designations that are used to denote NILO 48 alloy are as below:-

  • UNS K94800
  • ASTM F30
  • DIN 17745
  • AFNOR NF A54-301.

Fabrication

Cold working

Cold working is not suitable for this alloy as it tends to distort the coefficients of thermal expansion.

Annealing

NILO 48 alloy may be annealed at 850 - 1000°C (1560 - 1830°F).

Applications

The NILO 48 alloy is used in the following applications:

  • Industrial Thermostat rods that operate up to 450°C (840°F)
  • Glass-to-metal seals for radio valves, incandescent electric lamps.

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