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SAE-AISI 8740 Steel vs. ACI-ASTM CA6NM Steel

Both SAE-AISI 8740 steel and ACI-ASTM CA6NM steel are iron alloys. They have 84% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is ACI-ASTM CA6NM steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 200
250
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 23
17
Fatigue Strength, MPa 270 to 350
380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 580 to 670
850
Tensile Strength: Yield (Proof), MPa 380 to 570
620

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 410
770
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
10
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.5
Embodied Energy, MJ/kg 20
34
Embodied Water, L/kg 50
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
130
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
1000
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 20 to 24
30
Strength to Weight: Bending, points 20 to 22
26
Thermal Diffusivity, mm2/s 10
6.7
Thermal Shock Resistance, points 17 to 20
31

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.060
Chromium (Cr), % 0.4 to 0.6
11.5 to 14
Iron (Fe), % 96.5 to 97.7
78.4 to 84.6
Manganese (Mn), % 0.75 to 1.0
0 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
0.4 to 1.0
Nickel (Ni), % 0.4 to 0.7
3.5 to 4.5
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030