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SAE-AISI 1084 Steel vs. SAE-AISI 81B45 Steel

Both SAE-AISI 1084 steel and SAE-AISI 81B45 steel are iron alloys. They have a very high 99% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1084 steel and the bottom bar is SAE-AISI 81B45 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 270
160 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
12 to 24
Fatigue Strength, MPa 320 to 370
250 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 470 to 550
340 to 400
Tensile Strength: Ultimate (UTS), MPa 780 to 930
540 to 670
Tensile Strength: Yield (Proof), MPa 510 to 600
350 to 560

Thermal Properties

Latent Heat of Fusion, J/g 240
250
Maximum Temperature: Mechanical, °C 400
410
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 51
40
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 19
20
Embodied Water, L/kg 46
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 81 to 89
77 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 700 to 960
320 to 840
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 28 to 33
19 to 24
Strength to Weight: Bending, points 24 to 27
19 to 22
Thermal Diffusivity, mm2/s 14
11
Thermal Shock Resistance, points 25 to 30
17 to 21

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0.8 to 0.93
0.43 to 0.48
Chromium (Cr), % 0
0.35 to 0.55
Iron (Fe), % 98.1 to 98.6
97 to 98
Manganese (Mn), % 0.6 to 0.9
0.75 to 1.0
Molybdenum (Mo), % 0
0.080 to 0.15
Nickel (Ni), % 0
0.2 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0 to 0.050
0 to 0.040