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ASTM Grade HP Steel vs. ASTM B477 Au-Ni-Ag

ASTM grade HP steel belongs to the iron alloys classification, while ASTM B477 Au-Ni-Ag belongs to the otherwise unclassified metals. There are 16 material properties with values for both materials. Properties with values for just one material (18, 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 ASTM grade HP 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, % 5.1
5.5 to 11
Poisson's Ratio 0.28
0.41
Shear Modulus, GPa 78
34
Tensile Strength: Ultimate (UTS), MPa 490
310 to 550

Thermal Properties

Latent Heat of Fusion, J/g 320
80
Melting Completion (Liquidus), °C 1370
1010
Melting Onset (Solidus), °C 1330
930
Specific Heat Capacity, J/kg-K 480
160
Thermal Expansion, µm/m-K 16
15

Otherwise Unclassified Properties

Density, g/cm3 7.9
17

Common Calculations

Stiffness to Weight: Axial, points 14
3.1
Stiffness to Weight: Bending, points 25
8.9
Strength to Weight: Axial, points 17
5.0 to 9.0
Strength to Weight: Bending, points 17
6.0 to 8.8
Thermal Shock Resistance, points 11
16 to 28

Alloy Composition

Carbon (C), % 0.35 to 0.75
0
Chromium (Cr), % 24 to 28
0
Gold (Au), % 0
74.2 to 75.8
Iron (Fe), % 29.2 to 42.7
0
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 33 to 37
2.6 to 3.4
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.5
0
Silver (Ag), % 0
21.4 to 22.6
Sulfur (S), % 0 to 0.040
0
Residuals, % 0
0 to 0.3