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UNS K93500 Low Expansion Alloy

K93500 alloy is an iron alloy formulated for controlled thermal expansion.

The properties of K93500 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 K93500 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.

Temper A (Annealed) K93500 Alloy Temper B (Half-Hard) K93500 Alloy

Temper C (Full-Hard) K93500 Alloy

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

30 % relative

Density

8.2 g/cm³ 510 lb/ft³

Embodied Carbon

4.7 kg CO₂/kg material

Embodied Energy

65 MJ/kg 28 x 10³ BTU/lb

Embodied Water

130 L/kg 16 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 23 points

Thermal Shock Resistance

15 to 25 points

Alloy Composition

Iron (Fe)Fe		61.4 to 63
Nickel (Ni)Ni		32 to 32
Cobalt (Co)Co		5.0 to 5.0
Manganese (Mn)Mn		0 to 0.6
Silicon (Si)Si		0 to 0.25
Chromium (Cr)Cr		0 to 0.25
Aluminum (Al)Al		0 to 0.1
Titanium (Ti)Ti		0 to 0.1
Zirconium (Zr)Zr		0 to 0.1
Magnesium (Mg)Mg		0 to 0.1
Carbon (C)C		0 to 0.050
Phosphorus (P)P		0 to 0.015
Sulfur (S)S		0 to 0.015