NILO K Alloys

Topics Covered

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

Introduction

NILO is an alloy of nickel and iron; the amount of nickel varies with each type of alloy. NILO alloys are known as controlled-expansion alloys. All controlled-expansion alloys exhibit a low expansion coefficient (in low and high temperature ranges), good ductility and toughness.

By varying the nickel content of the NILO alloys, different types of NILO alloys are formed. The various types of NILO alloys are NILO 36, NILO 42, NILO 48 and NILO K.

The NILO K alloy consists of 29% nickel and apart from its iron content, it contains 17% of cobalt. The coefficient of expansion of this alloy matches that of borosilicate glass and alumina ceramics. This alloy is available in the form of strips, wires, round and sheets.

The NILO K alloy exhibits magnetic properties that are dictated by the heat treatment and its composition.

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

Chemical Composition

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

Element Content (%)
Iron, Fe 53
Nickel, Ni 29
Cobalt, Co 17
Others Remainder

Physical Properties

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

Properties Metric Imperial
Density 8.16 gm/cm3 0.295 lb/in3

Mechanical Properties

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

Properties Metric Imperial
Tensile strength 520MPa 75.4 ksi
Yield strength 340 MPa 49.3 ksi
Modulus of elasticity 130 GPa 18900 ksi

Other Designations

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

  • UNS K94610
  • ASTM F15
  • 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 K alloy may be annealed at 850 - 1000°C (1560 - 1830°F).

Applications

The NILO K alloy is used in the following applications:

  • Integrated-circuit lead frames
  • Glass-to-metal seals.

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