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Nickel 684 vs. AISI 309 Stainless Steel

Nickel 684 belongs to the nickel alloys classification, while AISI 309 stainless steel belongs to the iron alloys. They have a modest 34% 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 (8, in this case) are not shown.

For each property being compared, the top bar is nickel 684 and the bottom bar is AISI 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
180 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 11
34 to 47
Fatigue Strength, MPa 390
250 to 280
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 76
78
Shear Strength, MPa 710
420 to 470
Tensile Strength: Ultimate (UTS), MPa 1190
600 to 710
Tensile Strength: Yield (Proof), MPa 800
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1000
980
Melting Completion (Liquidus), °C 1370
1450
Melting Onset (Solidus), °C 1320
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 13
15

Otherwise Unclassified Properties

Base Metal Price, % relative 75
19
Density, g/cm3 8.3
7.8
Embodied Carbon, kg CO2/kg material 10
3.6
Embodied Energy, MJ/kg 140
51
Embodied Water, L/kg 360
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 1610
170 to 310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 40
21 to 25
Strength to Weight: Bending, points 30
20 to 23
Thermal Shock Resistance, points 34
14 to 16

Alloy Composition

Aluminum (Al), % 2.5 to 3.3
0
Boron (B), % 0.0030 to 0.010
0
Carbon (C), % 0 to 0.15
0 to 0.2
Chromium (Cr), % 15 to 20
22 to 24
Cobalt (Co), % 13 to 20
0
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 4.0
58 to 66
Manganese (Mn), % 0 to 0.75
0 to 2.0
Molybdenum (Mo), % 3.0 to 5.0
0
Nickel (Ni), % 42.7 to 64
12 to 15
Phosphorus (P), % 0 to 0.015
0 to 0.045
Silicon (Si), % 0 to 0.75
0 to 0.75
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 2.5 to 3.3
0