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ASTM B685 Alloy vs. S21640 Stainless Steel

ASTM B685 alloy belongs to the otherwise unclassified metals classification, while S21640 stainless steel belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is ASTM B685 alloy and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
200
Poisson's Ratio 0.37
0.28
Shear Modulus, GPa 43
78
Tensile Strength: Ultimate (UTS), MPa 660 to 1060
740

Thermal Properties

Latent Heat of Fusion, J/g 180
290
Melting Completion (Liquidus), °C 1230
1430
Melting Onset (Solidus), °C 1200
1380
Specific Heat Capacity, J/kg-K 300
480
Thermal Expansion, µm/m-K 14
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 5.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 4.1
2.8

Otherwise Unclassified Properties

Density, g/cm3 11
7.7

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
27
Strength to Weight: Bending, points 16 to 21
23
Thermal Shock Resistance, points 28 to 46
16

Alloy Composition

Aluminum (Al), % 0 to 0.0050
0
Cadmium (Cd), % 0 to 0.050
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0
17.5 to 19.5
Copper (Cu), % 39.5 to 40.5
0
Iron (Fe), % 0 to 0.050
63 to 74.3
Lead (Pb), % 0 to 0.030
0
Manganese (Mn), % 0
3.5 to 6.5
Molybdenum (Mo), % 0
0.5 to 2.0
Nickel (Ni), % 0
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0
0.080 to 0.3
Palladium (Pd), % 59 to 60.5
0
Phosphorus (P), % 0
0 to 0.060
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