Alloy 32-5

Material

Alloy 32-5, Super Invar® 32-5, UNS K93500, 64Fe32Ni5Co, 4J32

Overview

Alloy 32-5, a magnetic, austenitic, solid solution alloy containing iron, nickel and cobalt, is designed to provide minimum thermal expansion at room temperatures. This alloy also exhibits austenite stability to service temperatures at least -67°F (-55°C).

Characteristics

Alloy 32-5 is a ultra low expansion alloy consisting of 32% Nickel, 5% Cobalt, and balance Iron. Alloy 32-5 exhibits near zero thermal expansion at room temperatures (one half of Invar Alloy 36), as well as thermal expansion properties less than that of Invar Alloy in the 67 to 203°F (-55 to 95°C) temperature range.

Application

The minimal expansion of Alloy 32-5 over this range of temperatures, makes this alloy useful in many applications including structural components and substrates in instrument systems requiring precision measurements.

Chemical composition (wt%)

Material Ni Fe Co Mn Si C Al
Alloy 32-5 31.5~33.0 balance 5.0 ≤0.60 ≤0.25 ≤0.05 ≤0.10
Material Mg Zr Ti Cr P S
Alloy 32-5 ≤0.10 ≤0.10 ≤0.10 ≤0.25 ≤0.015 ≤0.015

Typical Mechanical Properties

Condition Tensile strength Yield strength Elongation
N/mm² ksi N/mm² ksi % in 2”
Annealed ≥483 ≥70 ≥276 ≥40 ≥40

Available Process

Cold worked and bright annealed

Cold worked, bright annealed, polished (MP, EP etc.)

Common Tests

  • ◎ Chemical composition
  • ◎ Tension
  • ◎ Hardness
  • ◎ Flaring
  • ◎ Flange
  • ◎ Flattening
  • ◎ Micro structure
  • ◎ Hydrostatic
  • ◎ NDT
  • ◎ Intergranular Corrosion
  • ◎ Surface condition
  • ◎ Shape and dimension
  • ◎ Positive Material Identification

Product forms

Capillary tube

  • ◎ OD 0.30 ~ 3.0 mm
  • ◎ WT 0.05 ~ 0.5 mm

Precision seamless tube

  • ◎ OD 3.0 ~ 89 mm
  • ◎ WT 0.10 ~ 10.0 mm

HP / UHP BA+ tube

  • ◎ OD 3.0 ~ 76 mm
  • ◎ WT 0.10 ~ 10.0 mm

Service

  • ◎ Precision cutting
  • ◎ Tube surface treatment, like ID surface super mirror polishing, best level could reach Ra0.0015um
  • ◎ Tube deep processing, like coiling, bending, end forming, body forming, laser processing, various needles processing, built to drawing and sample, etc.