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SAE-AISI 4718 Steel vs. ACI-ASTM CK20 Steel

Both SAE-AISI 4718 steel and ACI-ASTM CK20 steel are iron alloys. They have 55% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4718 steel and the bottom bar is ACI-ASTM CK20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
150
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 24
37
Fatigue Strength, MPa 270
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 510
530
Tensile Strength: Yield (Proof), MPa 370
260

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 420
1100
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
14
Thermal Expansion, µm/m-K 11
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 3.0
25
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
4.4
Embodied Energy, MJ/kg 21
62
Embodied Water, L/kg 51
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
160
Resilience: Unit (Modulus of Resilience), kJ/m3 360
170
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
19
Strength to Weight: Bending, points 18
19
Thermal Diffusivity, mm2/s 10
3.7
Thermal Shock Resistance, points 17
13

Alloy Composition

Carbon (C), % 0.16 to 0.21
0 to 0.2
Chromium (Cr), % 0.35 to 0.55
23 to 27
Iron (Fe), % 96.3 to 97.4
46.7 to 58
Manganese (Mn), % 0.7 to 0.9
0 to 2.0
Molybdenum (Mo), % 0.3 to 0.4
0 to 0.5
Nickel (Ni), % 0.9 to 1.2
19 to 22
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 2.0
Sulfur (S), % 0 to 0.040
0 to 0.040