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Nickel 685 vs. AISI 309H Stainless Steel

Nickel 685 belongs to the nickel alloys classification, while AISI 309H stainless steel belongs to the iron alloys. They have a modest 35% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 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 nickel 685 and the bottom bar is AISI 309H stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 350
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
40
Fatigue Strength, MPa 470
200
Poisson's Ratio 0.29
0.27
Reduction in Area, % 20
51
Shear Modulus, GPa 77
78
Shear Strength, MPa 770
400
Tensile Strength: Ultimate (UTS), MPa 1250
580
Tensile Strength: Yield (Proof), MPa 850
230

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1000
1080
Melting Completion (Liquidus), °C 1380
1420
Melting Onset (Solidus), °C 1330
1370
Specific Heat Capacity, J/kg-K 460
480
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 75
19
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 10
3.6
Embodied Energy, MJ/kg 140
51
Embodied Water, L/kg 340
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
190
Resilience: Unit (Modulus of Resilience), kJ/m3 1820
130
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 42
21
Strength to Weight: Bending, points 31
20
Thermal Diffusivity, mm2/s 3.3
4.0
Thermal Shock Resistance, points 37
13

Alloy Composition

Aluminum (Al), % 1.2 to 1.6
0
Boron (B), % 0.0030 to 0.010
0
Carbon (C), % 0.030 to 0.1
0.040 to 0.1
Chromium (Cr), % 18 to 21
22 to 24
Cobalt (Co), % 12 to 15
0
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 0 to 2.0
58.1 to 66
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 3.5 to 5.0
0
Nickel (Ni), % 49.6 to 62.5
12 to 15
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0 to 0.75
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 2.8 to 3.3
0
Zinc (Zn), % 0.020 to 0.12
0