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ACI-ASTM CF8M Steel vs. SAE-AISI 81B45 Steel

Both ACI-ASTM CF8M steel and SAE-AISI 81B45 steel are iron alloys. They have 68% 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 CF8M steel and the bottom bar is SAE-AISI 81B45 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
160 to 200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 50
12 to 24
Fatigue Strength, MPa 280
250 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 540
540 to 670
Tensile Strength: Yield (Proof), MPa 290
350 to 560

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1000
410
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
40
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 19
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.8
1.5
Embodied Energy, MJ/kg 53
20
Embodied Water, L/kg 160
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
77 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 210
320 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
19 to 24
Strength to Weight: Bending, points 19
19 to 22
Thermal Diffusivity, mm2/s 4.3
11
Thermal Shock Resistance, points 12
17 to 21

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0 to 0.080
0.43 to 0.48
Chromium (Cr), % 18 to 21
0.35 to 0.55
Iron (Fe), % 60.3 to 71
97 to 98
Manganese (Mn), % 0 to 1.5
0.75 to 1.0
Molybdenum (Mo), % 2.0 to 3.0
0.080 to 0.15
Nickel (Ni), % 9.0 to 12
0.2 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 2.0
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.040