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SAE-AISI P21 Steel vs. Nickel 684

SAE-AISI P21 steel belongs to the iron alloys classification, while nickel 684 belongs to the nickel alloys. There are 19 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI P21 steel and the bottom bar is nickel 684.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 1130
1190

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1450
1370
Melting Onset (Solidus), °C 1410
1320
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
75
Density, g/cm3 7.9
8.3
Embodied Carbon, kg CO2/kg material 2.3
10
Embodied Energy, MJ/kg 32
140
Embodied Water, L/kg 62
360

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 40
40
Strength to Weight: Bending, points 31
30
Thermal Shock Resistance, points 37
34

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.3
Boron (B), % 0
0.0030 to 0.010
Carbon (C), % 0.18 to 0.22
0 to 0.15
Chromium (Cr), % 0 to 0.5
15 to 20
Cobalt (Co), % 1.1 to 1.3
13 to 20
Copper (Cu), % 0 to 0.25
0 to 0.15
Iron (Fe), % 92.1 to 94.2
0 to 4.0
Manganese (Mn), % 0.35 to 0.72
0 to 0.75
Molybdenum (Mo), % 0
3.0 to 5.0
Nickel (Ni), % 3.9 to 4.3
42.7 to 64
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0.2 to 0.4
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
2.5 to 3.3
Vanadium (V), % 0.15 to 0.25
0