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SAE-AISI 81B45 Steel vs. SAE-AISI M1 Steel

Both SAE-AISI 81B45 steel and SAE-AISI M1 steel are iron alloys. They have 85% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 81B45 steel and the bottom bar is SAE-AISI M1 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 540 to 670
730 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1460
1560
Melting Onset (Solidus), °C 1420
1510
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 40
29
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
18
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.5
7.0
Embodied Energy, MJ/kg 20
99
Embodied Water, L/kg 49
98

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19 to 24
25 to 73
Strength to Weight: Bending, points 19 to 22
22 to 45
Thermal Diffusivity, mm2/s 11
8.0
Thermal Shock Resistance, points 17 to 21
23 to 66

Alloy Composition

Boron (B), % 0.00050 to 0.0030
0
Carbon (C), % 0.43 to 0.48
0.78 to 0.88
Chromium (Cr), % 0.35 to 0.55
3.5 to 4.0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 97 to 98
81 to 84.8
Manganese (Mn), % 0.75 to 1.0
0.15 to 0.4
Molybdenum (Mo), % 0.080 to 0.15
8.2 to 9.2
Nickel (Ni), % 0.2 to 0.4
0 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0.2 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.030
Tungsten (W), % 0
1.4 to 2.1
Vanadium (V), % 0
1.0 to 1.4

Comparable Variants