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Quarter-Hard ASTM F15 Alloy

Quarter-hard ASTM F15 is ASTM F15 Fe-Ni-Co in the quarter-hard temper. It has the second lowest strength compared to the other variants of ASTM F15 Fe-Ni-Co. The graph bars on the material properties cards below compare quarter-hard ASTM F15 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 28 x 106 psi

Poisson's Ratio

0.3

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

610 MPa 88 x 103 psi

Thermal Properties

Curie Temperature

430 °C 810 °F

Latent Heat of Fusion

270 J/g

Melting Completion (Liquidus)

1410 °C 2570 °F

Melting Onset (Solidus)

1450 °C 2640 °F

Specific Heat Capacity

460 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

17 W/m-K 9.8 BTU/h-ft-°F

Thermal Expansion

6.0 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

3.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

4.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

49 % relative

Density

8.3 g/cm3 520 lb/ft3

Embodied Carbon

5.2 kg CO2/kg material

Embodied Energy

71 MJ/kg 30 x 103 BTU/lb

Embodied Water

190 L/kg 23 gal/lb

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

19 points

Thermal Diffusivity

4.5 mm2/s

Thermal Shock Resistance

38 points

Alloy Composition

Iron (Fe)Fe 50.3 to 56
Nickel (Ni)Ni 28 to 30
Cobalt (Co)Co 16 to 18
Manganese (Mn)Mn 0 to 0.5
Silicon (Si)Si 0 to 0.2
Chromium (Cr)Cr 0 to 0.2
Molybdenum (Mo)Mo 0 to 0.2
Copper (Cu)Cu 0 to 0.2
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 0.040

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

Followup Questions

Further Reading

ASTM F15: Standard Specification for Iron-Nickel-Cobalt Sealing Alloy

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

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005