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ASTM A387 Grade 21 Steel vs. N06920 Nickel

ASTM A387 grade 21 steel belongs to the iron alloys classification, while N06920 nickel belongs to the nickel alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 21 steel and the bottom bar is N06920 nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 21
39
Fatigue Strength, MPa 160 to 250
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
82
Shear Strength, MPa 310 to 370
500
Tensile Strength: Ultimate (UTS), MPa 500 to 590
730
Tensile Strength: Yield (Proof), MPa 230 to 350
270

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Maximum Temperature: Mechanical, °C 480
990
Melting Completion (Liquidus), °C 1470
1500
Melting Onset (Solidus), °C 1430
1440
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 41
11
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
1.6

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
55
Density, g/cm3 7.9
8.6
Embodied Carbon, kg CO2/kg material 1.8
9.4
Embodied Energy, MJ/kg 23
130
Embodied Water, L/kg 62
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
230
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
180
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 18 to 21
24
Strength to Weight: Bending, points 18 to 20
21
Thermal Diffusivity, mm2/s 11
2.8
Thermal Shock Resistance, points 14 to 17
19

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.030
Chromium (Cr), % 2.8 to 3.3
20.5 to 23
Cobalt (Co), % 0
0 to 5.0
Iron (Fe), % 94.4 to 96
17 to 20
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
8.0 to 10
Nickel (Ni), % 0
36.9 to 53.5
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030
Tungsten (W), % 0
1.0 to 3.0