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ACI-ASTM CT15C Steel vs. SAE-AISI 81B45 Steel

Both ACI-ASTM CT15C steel and SAE-AISI 81B45 steel are iron alloys. They have 47% 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 CT15C steel and the bottom bar is SAE-AISI 81B45 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
160 to 200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 23
12 to 24
Fatigue Strength, MPa 130
250 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 500
540 to 670
Tensile Strength: Yield (Proof), MPa 190
350 to 560

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Maximum Temperature: Mechanical, °C 1080
410
Melting Completion (Liquidus), °C 1410
1460
Melting Onset (Solidus), °C 1360
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 12
40
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 36
2.3
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 6.1
1.5
Embodied Energy, MJ/kg 88
20
Embodied Water, L/kg 190
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 90
77 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 93
320 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
19 to 24
Strength to Weight: Bending, points 17
19 to 22
Thermal Diffusivity, mm2/s 3.2
11
Thermal Shock Resistance, points 12
17 to 21

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0.050 to 0.15
0.43 to 0.48
Chromium (Cr), % 19 to 21
0.35 to 0.55
Iron (Fe), % 40.3 to 49.2
97 to 98
Manganese (Mn), % 0.15 to 1.5
0.75 to 1.0
Molybdenum (Mo), % 0
0.080 to 0.15
Nickel (Ni), % 31 to 34
0.2 to 0.4
Niobium (Nb), % 0.5 to 1.5
0
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.15 to 1.5
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040