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AWS BCo-1 vs. ASTM B628 Ag-Cu

AWS BCo-1 belongs to the cobalt alloys classification, while ASTM B628 Ag-Cu belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is AWS BCo-1 and the bottom bar is ASTM B628 Ag-Cu.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
83
Poisson's Ratio 0.3
0.36
Shear Modulus, GPa 78
31
Tensile Strength: Ultimate (UTS), MPa 700
350 to 760

Thermal Properties

Latent Heat of Fusion, J/g 420
140
Melting Completion (Liquidus), °C 1150
780
Melting Onset (Solidus), °C 1120
780
Specific Heat Capacity, J/kg-K 480
280
Thermal Expansion, µm/m-K 12
19

Otherwise Unclassified Properties

Density, g/cm3 8.1
10

Common Calculations

Stiffness to Weight: Axial, points 14
4.6
Stiffness to Weight: Bending, points 24
14
Strength to Weight: Axial, points 24
9.5 to 21
Strength to Weight: Bending, points 22
11 to 18
Thermal Shock Resistance, points 21
16 to 34

Alloy Composition

Aluminum (Al), % 0 to 0.050
0 to 0.0050
Boron (B), % 0.7 to 0.9
0
Cadmium (Cd), % 0
0 to 0.050
Carbon (C), % 0.35 to 0.45
0
Chromium (Cr), % 18 to 20
0
Cobalt (Co), % 46 to 54
0
Copper (Cu), % 0
26.6 to 29
Iron (Fe), % 0 to 1.0
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Nickel (Ni), % 16 to 18
0 to 0.010
Phosphorus (P), % 0 to 0.020
0 to 0.030
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 7.5 to 8.5
0
Silver (Ag), % 0
71 to 73
Sulfur (S), % 0 to 0.020
0
Titanium (Ti), % 0 to 0.050
0
Tungsten (W), % 3.5 to 4.5
0
Zinc (Zn), % 0
0 to 0.060
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0
0 to 0.21