INVAR 36 per D33028
D33028 is a Boeing specification for INVAR 36, a low-expansion nickel-iron alloy engineered for aerospace and defense applications.
This specification ensures the material’s dimensional stability, mechanical performance, and corrosion resistance, critical for use in precision aerospace components.
INVAR 36 (Also known as NILO 36, Pernifer 36) is an alloy made up of 36% nickel and 64% iron. It has a low coefficient of thermal expansion, making it useful for applications where dimensional stability is required, such as in precision instruments and optical devices. It is also known for its high strength and corrosion resistance. Invar 36 is commonly used in electronic, aerospace and other high-tech industry.
Product Forms & Size Range
INVAR 36 Round Bar diameters range from 0.125″ to 8.00″ diameter.
INVAR 36 Plate Thickness ranges from 0.1875″ to 5.00″ Thick.
INVAR 36 Sheet Thickness ranges from 0.015″ to 0.1560″ Thick. Some of our Coil stock can be converted to thinner material on demand
Applications of INVAR 36 per D33028
INVAR 36 is highly resistant to corrosion, making it suitable for use in aerospace applications such as aircraft and spacecraft.
NILO 36 is used in the electrical and electronic industry as a substrate material for multilayer ceramic capacitors, lead frames for semiconductors, and as a material for microwave devices.
NILO 36 is also used in cryogenic applications as it maintains its dimensional stability at low temperatures.
NILO 36 is used in nuclear industry as well, for applications such as fuel rod cladding, and control rod drive mechanisms.
NILO 36 is used in the optical industry, particularly for the manufacturing of mirrors and lenses, due to its low coefficient of thermal expansion.
NICKEL X-750 SPECIFICATIONS
SHEET & PLATE
Sheets and plates for high-temperature aerospace and industrial applications.
BARS & FORGINGS
Bars and forgings designed for high-strength, creep, and fatigue-resistant components.
ROCKWELL INTERNATIONAL
Specifications and standards issued by Rockwell International for NILO 36 components.
UNS NUMBERS
Unified Numbering System (UNS) identifiers for NILO 36 alloys.
Certified Material for Critical Service
INVAR 36 is fully compliant with aerospace and high-tech standards, making it suitable for critical service applications. All material is:
- Certified to ASTM and MIL standards, including MIL-S-16598, ASTM F-1684, and MIL-I-23011
- Supplied with full Material Test Reports (MTRs), confirming chemical composition, mechanical properties, and heat treatment
- Traceable to UNS numbers K93600 and K93601 for full quality assurance
- Manufactured under strict quality control procedures to ensure consistency, reliability, and safety