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Nickel 685 vs. AISI 321 Stainless Steel

Nickel 685 belongs to the nickel alloys classification, while AISI 321 stainless steel belongs to the iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 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 321 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 350
170 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
34 to 50
Fatigue Strength, MPa 470
220 to 270
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 770
420 to 460
Tensile Strength: Ultimate (UTS), MPa 1250
590 to 690
Tensile Strength: Yield (Proof), MPa 850
220 to 350

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1000
870
Melting Completion (Liquidus), °C 1380
1430
Melting Onset (Solidus), °C 1330
1400
Specific Heat Capacity, J/kg-K 460
480
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 75
16
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 10
3.2
Embodied Energy, MJ/kg 140
45
Embodied Water, L/kg 340
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
190 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 1820
130 to 310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 42
21 to 25
Strength to Weight: Bending, points 31
20 to 22
Thermal Diffusivity, mm2/s 3.3
4.1
Thermal Shock Resistance, points 37
13 to 15

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 to 0.080
Chromium (Cr), % 18 to 21
17 to 19
Cobalt (Co), % 12 to 15
0
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 0 to 2.0
65.3 to 74
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
9.0 to 12
Nitrogen (N), % 0
0 to 0.1
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 to 0.7
Zinc (Zn), % 0.020 to 0.12
0