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

Both SAE-AISI 81B45 steel and ACI-ASTM CF8M 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 SAE-AISI 81B45 steel and the bottom bar is ACI-ASTM CF8M steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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