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S38815 Stainless Steel vs. ASTM B685 Alloy

S38815 stainless steel belongs to the iron alloys classification, while ASTM B685 alloy belongs to the otherwise unclassified metals. There are 15 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 S38815 stainless steel and the bottom bar is ASTM B685 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
120
Poisson's Ratio 0.29
0.37
Shear Modulus, GPa 74
43
Tensile Strength: Ultimate (UTS), MPa 610
660 to 1060

Thermal Properties

Latent Heat of Fusion, J/g 370
180
Melting Completion (Liquidus), °C 1360
1230
Melting Onset (Solidus), °C 1310
1200
Specific Heat Capacity, J/kg-K 500
300
Thermal Expansion, µm/m-K 15
14

Otherwise Unclassified Properties

Density, g/cm3 7.5
11

Common Calculations

Stiffness to Weight: Axial, points 14
6.1
Stiffness to Weight: Bending, points 25
15
Strength to Weight: Axial, points 22
17 to 27
Strength to Weight: Bending, points 21
16 to 21
Thermal Shock Resistance, points 15
28 to 46

Alloy Composition

Aluminum (Al), % 0 to 0.3
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 13 to 15
0
Copper (Cu), % 0.75 to 1.5
39.5 to 40.5
Iron (Fe), % 56.1 to 67
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 0.75 to 1.5
0
Nickel (Ni), % 13 to 17
0
Palladium (Pd), % 0
59 to 60.5
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 5.5 to 6.5
0
Silver (Ag), % 0
0 to 0.1
Sulfur (S), % 0 to 0.020
0
Zinc (Zn), % 0
0 to 0.060
Residuals, % 0
0 to 0.2