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ASTM B685 Alloy vs. S32550 Stainless Steel

ASTM B685 alloy belongs to the otherwise unclassified metals classification, while S32550 stainless steel belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.

For each property being compared, the top bar is ASTM B685 alloy and the bottom bar is S32550 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
200
Poisson's Ratio 0.37
0.27
Shear Modulus, GPa 43
80
Tensile Strength: Ultimate (UTS), MPa 660 to 1060
860

Thermal Properties

Latent Heat of Fusion, J/g 180
300
Melting Completion (Liquidus), °C 1230
1440
Melting Onset (Solidus), °C 1200
1390
Specific Heat Capacity, J/kg-K 300
480
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 5.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 4.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 11
7.8

Common Calculations

Stiffness to Weight: Axial, points 6.1
14
Stiffness to Weight: Bending, points 15
25
Strength to Weight: Axial, points 17 to 27
31
Strength to Weight: Bending, points 16 to 21
26
Thermal Shock Resistance, points 28 to 46
23

Alloy Composition

Aluminum (Al), % 0 to 0.0050
0
Cadmium (Cd), % 0 to 0.050
0
Carbon (C), % 0
0 to 0.040
Chromium (Cr), % 0
24 to 27
Copper (Cu), % 39.5 to 40.5
1.5 to 2.5
Iron (Fe), % 0 to 0.050
57.2 to 67
Lead (Pb), % 0 to 0.030
0
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0
2.9 to 3.9
Nickel (Ni), % 0
4.5 to 6.5
Nitrogen (N), % 0
0.1 to 0.25
Palladium (Pd), % 59 to 60.5
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Silver (Ag), % 0 to 0.1
0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.060
0
Residuals, % 0 to 0.2
0