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Nickel 685 vs. AISI 304 Stainless Steel

Nickel 685 belongs to the nickel alloys classification, while AISI 304 stainless steel belongs to the iron alloys. They have a modest 30% 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 (6, in this case) are not shown.

For each property being compared, the top bar is nickel 685 and the bottom bar is AISI 304 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 350
170 to 360
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
8.0 to 43
Fatigue Strength, MPa 470
210 to 440
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 770
400 to 690
Tensile Strength: Ultimate (UTS), MPa 1250
580 to 1180
Tensile Strength: Yield (Proof), MPa 850
230 to 860

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1000
710
Melting Completion (Liquidus), °C 1380
1450
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
15
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 10
3.0
Embodied Energy, MJ/kg 140
43
Embodied Water, L/kg 340
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
86 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 1820
140 to 1870
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 42
21 to 42
Strength to Weight: Bending, points 31
20 to 32
Thermal Diffusivity, mm2/s 3.3
4.2
Thermal Shock Resistance, points 37
12 to 25

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
18 to 20
Cobalt (Co), % 12 to 15
0
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 0 to 2.0
66.5 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
8.0 to 10.5
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
Zinc (Zn), % 0.020 to 0.12
0