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UNS K93603 Low Expansion Alloy

K93603 alloy is an iron alloy formulated for controlled thermal expansion.

The properties of K93603 alloy include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare K93603 alloy to: low-expansion iron alloys (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Poisson's Ratio

0.3

Shear Modulus

72 GPa 10 x 106 psi

Tensile Strength: Ultimate (UTS)

490 to 810 MPa 72 to 120 x 103 psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Melting Completion (Liquidus)

1430 °C 2600 °F

Melting Onset (Solidus)

1380 °C 2520 °F

Specific Heat Capacity

460 J/kg-K 0.11 BTU/lb-°F

Thermal Expansion

12 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

25 % relative

Density

8.2 g/cm3 510 lb/ft3

Embodied Carbon

4.8 kg CO2/kg material

Embodied Energy

66 MJ/kg 28 x 103 BTU/lb

Embodied Water

120 L/kg 14 gal/lb

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

17 to 27 points

Strength to Weight: Bending

17 to 24 points

Thermal Shock Resistance

15 to 25 points

Alloy Composition

Iron (Fe) 61.8 to 64
Nickel (Ni) 36 to 36
Manganese (Mn) 0 to 0.6
Cobalt (Co) 0 to 0.5
Silicon (Si) 0 to 0.4
Chromium (Cr) 0 to 0.25
Aluminum (Al) 0 to 0.1
Titanium (Ti) 0 to 0.1
Zirconium (Zr) 0 to 0.1
Magnesium (Mg) 0 to 0.1
Carbon (C) 0 to 0.050
Phosphorus (P) 0 to 0.015
Sulfur (S) 0 to 0.015

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM F1684: Standard Specification for Iron-Nickel and Iron-Nickel-Cobalt Alloys for Low Thermal Expansion Applications

Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015