4J36
Invar 36 — Fe-Ni alloy with near-zero thermal expansion for precision instruments and cryogenic service.
Introduction
§01 — General4J36 (Invar 36) is an iron-nickel alloy exhibiting exceptionally low thermal expansion coefficient (≈1.3 × 10⁻⁶/°C) from cryogenic temperatures to 230°C. It is the essential material for precision instrument components, optical benches, LNG tank membranes and composite tooling where dimensional stability under temperature variation is critical.
Quick Facts
- Density
- 8.1 g/cm³
- Max Service Temp
- 230°C
- Series
- Precision
Available Product Forms
§02 — FormsKey Characteristics
§03 — FeaturesTypical Uses
§04 — ApplicationsFrequently Asked Questions
4J36 FAQWhat is 4J36 used for?
4J36 is a Precision alloy used in Precision optical benches and mounts and LNG carrier tank membranes. It offers Near-zero thermal expansion (α ≈ 1.3 × 10⁻⁶/°C) and Invar 36 standard.
What is the chemical composition of 4J36?
4J36 is a controlled-composition Precision alloy supplied to ASTM F1684 and GB/T 14986. Contact us for full mill test certificate with heat-specific chemistry.
What forms is 4J36 available in?
4J36 is regularly supplied in Wire, Strip, Bar & Rod, Plate & Sheet. Custom forms and dimensions available on request.
What is the maximum service temperature of 4J36?
4J36 is rated for service up to 230°C. Contact our metallurgy team for specific application recommendations.
Need 4J36 material?
Request a quote with your specification — grade, form, dimensions and quantity.