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ACI-ASTM CA6NM Steel vs. SAE-AISI 8645 Steel

Both ACI-ASTM CA6NM steel and SAE-AISI 8645 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 ACI-ASTM CA6NM steel and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
180 to 200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
12 to 23
Fatigue Strength, MPa 380
280 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 850
600 to 670
Tensile Strength: Yield (Proof), MPa 620
390 to 560

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 770
410
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1400
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 2.8
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
8.4

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
77 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 1000
420 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 30
21 to 24
Strength to Weight: Bending, points 26
20 to 22
Thermal Diffusivity, mm2/s 6.7
10
Thermal Shock Resistance, points 31
18 to 20

Alloy Composition

Carbon (C), % 0 to 0.060
0.43 to 0.48
Chromium (Cr), % 11.5 to 14
0.4 to 0.6
Iron (Fe), % 78.4 to 84.6
96.5 to 97.7
Manganese (Mn), % 0 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0.4 to 1.0
0.15 to 0.25
Nickel (Ni), % 3.5 to 4.5
0.4 to 0.7
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040