Free-Cut Invar "36"®

UNS #K93601

Free-Cut Invar "36"® is a free-machining 36% nickel-iron alloy possessing a rate of thermal expansion approximately one-tenth that of carbon steel at temperatures up to 400°F (204°C). Developed by adding small additions of selenium, it offers improved machining characteristics over the original alloy. It has been used in conjunction with high expansion alloys in applications where a motion is desired when the temperature changes.

Type Analysis

  • Carbon (Maximum) 0.05
  • Silicon (Maximum) 0.35
  • Nickel (Nominal) 36
  • Manganese (Maximum) 0.9
  • Cobalt (Nominal) 0.2
  • Iron (Nominal) Balance
  • Selenium (Nominal) 0.2

Applications

Radio and electronic devices, aircraft controls, rod and tube assemblies for temperature regulators

Applicable Specifications

  • ASTM F1684

Billet

Flats

Square

Wire

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