INVAR 36 per MIL-S-16598v
MIL-S-16598 is a U.S. Military Specification covering INVAR 36, a nickel-iron low-expansion alloy designed for aerospace, defense, energy, and precision manufacturing.
This standard applies to bars and forgings used in high-performance systems where dimensional stability and thermal control are essential.
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.
Product Forms & Size Range of MILS-S-16598
INVAR 36 Round Bar diameters range from 0.125″ to 8.00″ diameter.
Applications of INVAR 36 Per MILS-S-16598
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