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S38815 Stainless Steel vs. Nickel 685

S38815 stainless steel belongs to the iron alloys classification, while nickel 685 belongs to the nickel alloys. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is S38815 stainless steel and the bottom bar is nickel 685.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
350
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 34
17
Fatigue Strength, MPa 230
470
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
77
Shear Strength, MPa 410
770
Tensile Strength: Ultimate (UTS), MPa 610
1250
Tensile Strength: Yield (Proof), MPa 290
850

Thermal Properties

Latent Heat of Fusion, J/g 370
320
Maximum Temperature: Mechanical, °C 860
1000
Melting Completion (Liquidus), °C 1360
1380
Melting Onset (Solidus), °C 1310
1330
Specific Heat Capacity, J/kg-K 500
460
Thermal Expansion, µm/m-K 15
12

Otherwise Unclassified Properties

Base Metal Price, % relative 19
75
Density, g/cm3 7.5
8.4
Embodied Carbon, kg CO2/kg material 3.8
10
Embodied Energy, MJ/kg 54
140
Embodied Water, L/kg 140
340

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
190
Resilience: Unit (Modulus of Resilience), kJ/m3 220
1820
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 22
42
Strength to Weight: Bending, points 21
31
Thermal Shock Resistance, points 15
37

Alloy Composition

Aluminum (Al), % 0 to 0.3
1.2 to 1.6
Boron (B), % 0
0.0030 to 0.010
Carbon (C), % 0 to 0.030
0.030 to 0.1
Chromium (Cr), % 13 to 15
18 to 21
Cobalt (Co), % 0
12 to 15
Copper (Cu), % 0.75 to 1.5
0 to 0.5
Iron (Fe), % 56.1 to 67
0 to 2.0
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0.75 to 1.5
3.5 to 5.0
Nickel (Ni), % 13 to 17
49.6 to 62.5
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 5.5 to 6.5
0 to 0.75
Sulfur (S), % 0 to 0.020
0 to 0.030
Titanium (Ti), % 0
2.8 to 3.3
Zinc (Zn), % 0
0.020 to 0.12