Invar 36

Material

Alloy 36, Invar 36, FeNi36, 1.3912, K93600, K93601, K93602, K93603, K93050, 1J36, 4J36

Overview

Alloy 36 is a binary iron-nickel alloy with a particularly low heat expansion coefficient, whereby the levels of carbon and manganese as well as freedom of impurities are significant. Cold forming also reduces the heat expansion. Artificial aging with gradual heat treatment stabilizes the expansion coefficients in a selected temperature range.

Characteristics

  • ◇ An extremely low expansion coefficient between -250°C (-418°F) and +260°C (500°F)
  • ◇ Good ductility and toughness.

Typical applications

  • ◇ Piping for storage and transport of liquefied gases
  • ◇ Components for OLED screens
  • ◇ Measuring and control devices for temperatures below 200°C (392°F), e.g. for thermostats
  • ◇ Bushings for screw or rivet joints between various metals
  • ◇ Bi-metal components and thermostatic bi-metals, where Alloy 36 is the passive component
  • ◇ Forms for the production of carbon-fiber reinforced plastic (CFP), especially for the aerospace industry
  • ◇ Frameworks for electronic control units in satellites and space travel down to -200°C (-328°F)
  • ◇ Support elements for electro-magnetic lenses in laser control units
  • ◇ Pendulum
  • ◇ Components for the automotive industry
  • ◇ Overhead power lines in an alloyed, age-hardenable variant

Chemical composition (wt%)

Material Ni Fe Co Mn Si C Al
Alloy 36 35.0~37.0 balance ≤0.50 ≤0.60 ≤0.40 ≤0.05 ≤0.10
Material Mg Zr Ti Cr P S
Alloy 36 ≤0.10 ≤0.10 ≤0.10 ≤0.25 ≤0.015 ≤0.015

Typical Mechanical Properties

Soft annealed condition

Temperature Tensile Strength Yield Strength
(0.2% Offset)
 Elongation on 50 mm
(2 inch)
 Reduction of Area
°C °F MPa ksi MPa ksi % %
20 68 490 71 240 35 42 70
100 212 430 62 180 26 43 70
200 392 430 62 110 16 45 70
300 572 410 59 93 13 48 70
400 752 350 51 93 13 53 70
500 932 290 42 93 13 59 69
600 1112 210 30 77 11 68 67

Corrosion resistance

In a dry atmosphere, Alloy 36 is corrosion resistant at room temperature. In unfavorable conditions, for example a humid atmosphere, corrosion may occur on the surface.

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.