NILO 42 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 and iron, containing varying amounts of nickel. NILO is known as a controlled-expansion alloy. Controlled expansion alloys are characterized by a low expansion coefficient (in low and high temperature ranges), good ductility and toughness. These alloys also exhibit good mechanical properties.

Based on the nickel content of the alloy, the NILO alloys are named as NILO 36, NILO 42, NILO 48 and NILO alloy K. NILO 42 alloy consists of 42% nickel and is characterized by a low and constant co-efficient of thermal expansion from room temperature to about 300°C (570°F). NILO 42 alloy is available in the form of strip, wire, tube and sheet.

This datasheet will look into the chemical composition, properties and applications of NILO 42 alloy.

Chemical Composition

The chemical composition of NILO 42 alloy is given in the following table.

Physical Properties

The following table discusses the physical properties of NILO 42 alloy.

Mechanical Properties

The mechanical properties of NILO 42 alloy after annealing are tabulated below.

Other Designations

Some of the other designations that are used to denote NILO 42 alloy are as below:

• UNS K94100
• ASTM F30
• B 753
• DIN 17745
• S.E.W 385

Fabrication

Cold working

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

Annealing

NILO 42 alloy may be annealed at 850 - 1000°C (1560 - 1830°F).

Applications

The NILO 42 alloy is used in the following applications:

• Semiconductor lead frames in integrated circuits
• Bi-metal thermostat strip
• Thermostat rods
• Ceramic-to-metal seals
• Glass-to-metal seals for television tubes, fluorescent lights.