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Temper D (Unannealed) K93050 Alloy

Unannealed K93050 alloy is K93050 alloy in the as-fabricated (no temper or treatment) condition. The graph bars on the material properties cards below compare unannealed K93050 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)

670 MPa 98 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

26 % 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

120 L/kg 14 gal/lb

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

23 points

Strength to Weight: Bending

21 points

Thermal Shock Resistance

21 points

Alloy Composition

Iron (Fe)Fe 61.4 to 63.9
Nickel (Ni)Ni 36 to 36
Manganese (Mn)Mn 0 to 1.0
Cobalt (Co)Co 0 to 0.5
Selenium (Se)Se 0.15 to 0.3
Silicon (Si)Si 0 to 0.35
Chromium (Cr)Cr 0 to 0.25
Carbon (C)C 0 to 0.15
Phosphorus (P)P 0 to 0.020
Sulfur (S)S 0 to 0.020

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

Followup Questions

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