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ACI-ASTM CA15M Steel vs. Nickel 718

ACI-ASTM CA15M steel belongs to the iron alloys classification, while nickel 718 belongs to the nickel alloys. They have a modest 32% 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 (7, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CA15M steel and the bottom bar is nickel 718.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 20
12 to 50
Fatigue Strength, MPa 330
460 to 760
Poisson's Ratio 0.28
0.29
Reduction in Area, % 34
34 to 64
Shear Modulus, GPa 76
75
Tensile Strength: Ultimate (UTS), MPa 690
930 to 1530
Tensile Strength: Yield (Proof), MPa 510
510 to 1330

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Maximum Temperature: Mechanical, °C 760
980
Melting Completion (Liquidus), °C 1450
1340
Melting Onset (Solidus), °C 1410
1260
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 27
11
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
1.5

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
75
Density, g/cm3 7.8
8.3
Embodied Carbon, kg CO2/kg material 2.1
13
Embodied Energy, MJ/kg 29
190
Embodied Water, L/kg 100
250

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
140 to 390
Resilience: Unit (Modulus of Resilience), kJ/m3 670
660 to 4560
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 25
31 to 51
Strength to Weight: Bending, points 22
25 to 35
Thermal Diffusivity, mm2/s 7.2
3.0
Thermal Shock Resistance, points 25
27 to 44

Alloy Composition

Aluminum (Al), % 0
0.2 to 0.8
Boron (B), % 0
0 to 0.0060
Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 11.5 to 14
17 to 21
Cobalt (Co), % 0
0 to 1.0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 82.1 to 88.4
11.1 to 24.6
Manganese (Mn), % 0 to 1.0
0 to 0.35
Molybdenum (Mo), % 0.15 to 1.0
2.8 to 3.3
Nickel (Ni), % 0 to 1.0
50 to 55
Niobium (Nb), % 0
4.8 to 5.5
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 0.65
0 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.015
Titanium (Ti), % 0
0.65 to 1.2