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ASTM A372 Grade K Steel vs. Nickel 718

ASTM A372 grade K steel belongs to the iron alloys classification, while nickel 718 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 (6, in this case) are not shown.

For each property being compared, the top bar is ASTM A372 grade K steel and the bottom bar is nickel 718.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 23
12 to 50
Fatigue Strength, MPa 440
460 to 760
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
75
Shear Strength, MPa 490
660 to 950
Tensile Strength: Ultimate (UTS), MPa 780
930 to 1530
Tensile Strength: Yield (Proof), MPa 620
510 to 1330

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 440
980
Melting Completion (Liquidus), °C 1460
1340
Melting Onset (Solidus), °C 1420
1260
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 48
11
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
1.5

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
75
Density, g/cm3 7.9
8.3
Embodied Carbon, kg CO2/kg material 1.8
13
Embodied Energy, MJ/kg 24
190
Embodied Water, L/kg 57
250

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
140 to 390
Resilience: Unit (Modulus of Resilience), kJ/m3 1010
660 to 4560
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 27
31 to 51
Strength to Weight: Bending, points 24
25 to 35
Thermal Diffusivity, mm2/s 13
3.0
Thermal Shock Resistance, points 23
27 to 44

Alloy Composition

Aluminum (Al), % 0
0.2 to 0.8
Boron (B), % 0
0 to 0.0060
Carbon (C), % 0 to 0.18
0 to 0.080
Chromium (Cr), % 1.0 to 1.8
17 to 21
Cobalt (Co), % 0
0 to 1.0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 93.4 to 96.6
11.1 to 24.6
Manganese (Mn), % 0.1 to 0.4
0 to 0.35
Molybdenum (Mo), % 0.2 to 0.6
2.8 to 3.3
Nickel (Ni), % 2.0 to 3.3
50 to 55
Niobium (Nb), % 0
4.8 to 5.5
Phosphorus (P), % 0 to 0.015
0 to 0.015
Silicon (Si), % 0.15 to 0.35
0 to 0.35
Sulfur (S), % 0 to 0.010
0 to 0.015
Titanium (Ti), % 0
0.65 to 1.2