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Nickel 684 vs. S17400 Stainless Steel

Nickel 684 belongs to the nickel alloys classification, while S17400 stainless steel belongs to the iron alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 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 S17400 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
280 to 440
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11
11 to 21
Fatigue Strength, MPa 390
380 to 670
Poisson's Ratio 0.29
0.28
Reduction in Area, % 17
40 to 62
Shear Modulus, GPa 76
75
Shear Strength, MPa 710
570 to 830
Tensile Strength: Ultimate (UTS), MPa 1190
910 to 1390
Tensile Strength: Yield (Proof), MPa 800
580 to 1250

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Maximum Temperature: Mechanical, °C 1000
850
Melting Completion (Liquidus), °C 1370
1440
Melting Onset (Solidus), °C 1320
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Base Metal Price, % relative 75
14
Density, g/cm3 8.3
7.8
Embodied Carbon, kg CO2/kg material 10
2.7
Embodied Energy, MJ/kg 140
39
Embodied Water, L/kg 360
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 1610
880 to 4060
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 40
32 to 49
Strength to Weight: Bending, points 30
27 to 35
Thermal Shock Resistance, points 34
30 to 46

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 0.070
Chromium (Cr), % 15 to 20
15 to 17
Cobalt (Co), % 13 to 20
0
Copper (Cu), % 0 to 0.15
3.0 to 5.0
Iron (Fe), % 0 to 4.0
70.4 to 78.9
Manganese (Mn), % 0 to 0.75
0 to 1.0
Molybdenum (Mo), % 3.0 to 5.0
0
Nickel (Ni), % 42.7 to 64
3.0 to 5.0
Niobium (Nb), % 0
0.15 to 0.45
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 2.5 to 3.3
0