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ACI-ASTM CA6NM Steel vs. SAE-AISI 81B45 Steel

Both ACI-ASTM CA6NM steel and SAE-AISI 81B45 steel are iron alloys. They have 83% 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 81B45 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
160 to 200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
12 to 24
Fatigue Strength, MPa 380
250 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 850
540 to 670
Tensile Strength: Yield (Proof), MPa 620
350 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
40
Thermal Expansion, µm/m-K 10
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.3
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
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
77 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 1000
320 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 30
19 to 24
Strength to Weight: Bending, points 26
19 to 22
Thermal Diffusivity, mm2/s 6.7
11
Thermal Shock Resistance, points 31
17 to 21

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0 to 0.060
0.43 to 0.48
Chromium (Cr), % 11.5 to 14
0.35 to 0.55
Iron (Fe), % 78.4 to 84.6
97 to 98
Manganese (Mn), % 0 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0.4 to 1.0
0.080 to 0.15
Nickel (Ni), % 3.5 to 4.5
0.2 to 0.4
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