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SAE-AISI A2 Steel vs. SAE-AISI 81B45 Steel

Both SAE-AISI A2 steel and SAE-AISI 81B45 steel are iron alloys. They have a moderately high 93% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A2 steel and the bottom bar is SAE-AISI 81B45 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Tensile Strength: Ultimate (UTS), MPa 710 to 2040
540 to 670

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 38
40
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.2
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 5.5
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.7
1.5
Embodied Energy, MJ/kg 38
20
Embodied Water, L/kg 73
49

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25 to 73
19 to 24
Strength to Weight: Bending, points 23 to 46
19 to 22
Thermal Diffusivity, mm2/s 10
11
Thermal Shock Resistance, points 25 to 71
17 to 21

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 1.0 to 1.1
0.43 to 0.48
Chromium (Cr), % 4.8 to 5.5
0.35 to 0.55
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 89.4 to 93.3
97 to 98
Manganese (Mn), % 0 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0.9 to 1.4
0.080 to 0.15
Nickel (Ni), % 0 to 0.3
0.2 to 0.4
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 0.15 to 0.5
0

Comparable Variants