Chemical composition Element Weight percent Ni 35.0–37.0 Fe Balance C 0.10 max Mn 0.60 max Si 0.35 max Cr 0.50 max Mo 0.50 max Cu 0.50 max P 0.025 max S 0.025 max Published Rolled Alloys composition range for Invar 36; confirm the ordered UNS and product specification. [5] Product specifications Product form Specification route Qualification Sheet strip ASTM B753 Thermostat component alloy route; confirm grade Sheet strip bar SEW 385 Manufacturer referenced route; agree edition Plate sheet strip bar wire tube ASTM F1684 Withdrawn 2024; legacy route; confirm UNS coverage Tubing Purchaser specification Agree chemistry, dimensions, expansion and testing Wire Purchaser specification Agree temper, dimensions and expansion requirements K93600, K93601 and K93603 appear in different producer literature; they are not automatically interchangeable. Historical F1684 listings do not establish blanket K93600 coverage. [2, 5, 12]

Mechanical properties Property Value Unit Tensile strength 490 MPa Yield strength at 0.2 percent offset 240 MPa Elongation over 50 mm 42 % Reduction of area 70 % Typical hot rolled and annealed NILO 36 bar at 20°C. [2, 5]

Application areas Semiconductor lead frames Glass seals in electronic tubes and lamp components Thermostat rods and bimetal components

Chemical composition Element Weight percent Ni 35.0–37.0 Fe Balance C 0.10 max Mn 0.60 max Si 0.35 max Cr 0.50 max Mo 0.50 max Cu 0.50 max P 0.025 max S 0.025 max Published Rolled Alloys composition range for Invar 36; confirm the ordered UNS and product specification. [5] Product specifications Product form Specification route Qualification Sheet strip ASTM B753 Thermostat component alloy route; confirm grade Sheet strip bar SEW 385 Manufacturer referenced route; agree edition Plate sheet strip bar wire tube ASTM F1684 Withdrawn 2024; legacy route; confirm UNS coverage Tubing Purchaser specification Agree chemistry, dimensions, expansion and testing Wire Purchaser specification Agree temper, dimensions and expansion requirements K93600, K93601 and K93603 appear in different producer literature; they are not automatically interchangeable. Historical F1684 listings do not establish blanket K93600 coverage. [2, 5, 12]

Mechanical properties Property Value Unit Tensile strength 490 MPa Yield strength at 0.2 percent offset 240 MPa Elongation over 50 mm 42 % Reduction of area 70 % Typical hot rolled and annealed NILO 36 bar at 20°C. [2, 5]

Application areas Semiconductor lead frames Glass seals in electronic tubes and lamp components Thermostat rods and bimetal components

Alloy 36/UNS K93600

Grade: Invar 36/Alloy 36/Nilo 36/UNS K93600

Sheet/Plate: 0.3mm-150mm

Strip/Foil: 0.02mm-16mm

Pipe: 6mm*0.5mm-1200mm*100mm

Bar: Ф6mm – Ф600mm

Wire: Ф0.01mm – Ф6mm

Others: Forged Rings, Flanges, Elbows, Tees, Reducers etc.

Standard: ASTM/ASME/AMS

Invar 36 is an iron nickel alloy valued for exceptionally low thermal expansion near room temperature. Its dimensional stability supports precision instruments, composite tooling and cryogenic equipment. The alloy can be formed, machined and welded, while suitable stress relief improves dimensional consistency after fabrication. Expansion behavior depends on composition, temperature range and processing history, so the required thermal performance should accompany the material designation.

Chemical composition

Element	Weight percent
Ni	35.0–37.0
Fe	Balance
C	0.10 max
Mn	0.60 max
Si	0.35 max
Cr	0.50 max
Mo	0.50 max
Cu	0.50 max
P	0.025 max
S	0.025 max

Published Rolled Alloys composition range for Invar 36; confirm the ordered UNS and product specification. [5]

Product specifications

Product form	Specification route	Qualification
Sheet strip	ASTM B753	Thermostat component alloy route; confirm grade
Sheet strip bar	SEW 385	Manufacturer referenced route; agree edition
Plate sheet strip bar wire tube	ASTM F1684	Withdrawn 2024; legacy route; confirm UNS coverage
Tubing	Purchaser specification	Agree chemistry, dimensions, expansion and testing
Wire	Purchaser specification	Agree temper, dimensions and expansion requirements

K93600, K93601 and K93603 appear in different producer literature; they are not automatically interchangeable. Historical F1684 listings do not establish blanket K93600 coverage. [2, 5, 12]

Mechanical properties

Property	Value	Unit
Tensile strength	490	MPa
Yield strength at 0.2 percent offset	240	MPa
Elongation over 50 mm	42	%
Reduction of area	70	%

Typical hot rolled and annealed NILO 36 bar at 20°C. [2, 5]

Application areas

Semiconductor lead frames
Glass seals in electronic tubes and lamp components
Thermostat rods and bimetal components

Introduction

Specification

Chemical composition

Element	Weight percent
Ni	35.0–37.0
Fe	Balance
C	0.10 max
Mn	0.60 max
Si	0.35 max
Cr	0.50 max
Mo	0.50 max
Cu	0.50 max
P	0.025 max
S	0.025 max

Published Rolled Alloys composition range for Invar 36; confirm the ordered UNS and product specification. [5]

Product specifications

Product form	Specification route	Qualification
Sheet strip	ASTM B753	Thermostat component alloy route; confirm grade
Sheet strip bar	SEW 385	Manufacturer referenced route; agree edition
Plate sheet strip bar wire tube	ASTM F1684	Withdrawn 2024; legacy route; confirm UNS coverage
Tubing	Purchaser specification	Agree chemistry, dimensions, expansion and testing
Wire	Purchaser specification	Agree temper, dimensions and expansion requirements

K93600, K93601 and K93603 appear in different producer literature; they are not automatically interchangeable. Historical F1684 listings do not establish blanket K93600 coverage. [2, 5, 12]

Mechanical