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ACI-ASTM CA40 Steel vs. SAE-AISI 8740 Steel

Both ACI-ASTM CA40 steel and SAE-AISI 8740 steel are iron alloys. They have 87% 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 ACI-ASTM CA40 steel and the bottom bar is SAE-AISI 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
170 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 10
11 to 23
Fatigue Strength, MPa 460
270 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 910
580 to 670
Tensile Strength: Yield (Proof), MPa 860
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 750
410
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1500
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 25
39
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
2.6
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.0
1.5
Embodied Energy, MJ/kg 28
20
Embodied Water, L/kg 100
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 1910
390 to 850
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 33
20 to 24
Strength to Weight: Bending, points 27
20 to 22
Thermal Diffusivity, mm2/s 6.7
10
Thermal Shock Resistance, points 33
17 to 20

Alloy Composition

Carbon (C), % 0.2 to 0.4
0.38 to 0.43
Chromium (Cr), % 11.5 to 14
0.4 to 0.6
Iron (Fe), % 81.5 to 88.3
96.5 to 97.7
Manganese (Mn), % 0 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0 to 0.5
0.2 to 0.3
Nickel (Ni), % 0 to 1.0
0.4 to 0.7
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.5
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.040