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ACI-ASTM CA15M Steel vs. ASTM B477 Au-Ni-Ag

ACI-ASTM CA15M steel belongs to the iron alloys classification, while ASTM B477 Au-Ni-Ag belongs to the otherwise unclassified metals. There are 18 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is ACI-ASTM CA15M steel and the bottom bar is ASTM B477 Au-Ni-Ag.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
95
Elongation at Break, % 20
5.5 to 11
Poisson's Ratio 0.28
0.41
Shear Modulus, GPa 76
34
Tensile Strength: Ultimate (UTS), MPa 690
310 to 550

Thermal Properties

Latent Heat of Fusion, J/g 270
80
Melting Completion (Liquidus), °C 1450
1010
Melting Onset (Solidus), °C 1410
930
Specific Heat Capacity, J/kg-K 480
160
Thermal Expansion, µm/m-K 10
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
14
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
7.5

Otherwise Unclassified Properties

Density, g/cm3 7.8
17

Common Calculations

Stiffness to Weight: Axial, points 14
3.1
Stiffness to Weight: Bending, points 25
8.9
Strength to Weight: Axial, points 25
5.0 to 9.0
Strength to Weight: Bending, points 22
6.0 to 8.8
Thermal Shock Resistance, points 25
16 to 28

Alloy Composition

Carbon (C), % 0 to 0.15
0
Chromium (Cr), % 11.5 to 14
0
Gold (Au), % 0
74.2 to 75.8
Iron (Fe), % 82.1 to 88.4
0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0.15 to 1.0
0
Nickel (Ni), % 0 to 1.0
2.6 to 3.4
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.65
0
Silver (Ag), % 0
21.4 to 22.6
Sulfur (S), % 0 to 0.040
0
Residuals, % 0
0 to 0.3