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ACI-ASTM CA6N Steel vs. SAE-AISI 4718 Steel

Both ACI-ASTM CA6N steel and SAE-AISI 4718 steel are iron alloys. They have 83% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CA6N steel and the bottom bar is SAE-AISI 4718 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17
24
Fatigue Strength, MPa 640
270
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Tensile Strength: Ultimate (UTS), MPa 1080
510
Tensile Strength: Yield (Proof), MPa 1060
370

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 740
420
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 23
39
Thermal Expansion, µm/m-K 9.9
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 11
3.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.5
1.6
Embodied Energy, MJ/kg 35
21
Embodied Water, L/kg 110
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
110
Resilience: Unit (Modulus of Resilience), kJ/m3 2900
360
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 38
18
Strength to Weight: Bending, points 30
18
Thermal Diffusivity, mm2/s 6.1
10
Thermal Shock Resistance, points 40
17

Alloy Composition

Carbon (C), % 0 to 0.060
0.16 to 0.21
Chromium (Cr), % 10.5 to 12.5
0.35 to 0.55
Iron (Fe), % 77.9 to 83.5
96.3 to 97.4
Manganese (Mn), % 0 to 0.5
0.7 to 0.9
Molybdenum (Mo), % 0
0.3 to 0.4
Nickel (Ni), % 6.0 to 8.0
0.9 to 1.2
Phosphorus (P), % 0 to 0.020
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040