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SAE-AISI 6150 Steel vs. SAE-AISI 81B45 Steel

Both SAE-AISI 6150 steel and SAE-AISI 81B45 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI 6150 steel and the bottom bar is SAE-AISI 81B45 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 350
160 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 15 to 23
12 to 24
Fatigue Strength, MPa 300 to 750
250 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 400 to 730
340 to 400
Tensile Strength: Ultimate (UTS), MPa 630 to 1200
540 to 670
Tensile Strength: Yield (Proof), MPa 420 to 1160
350 to 560

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
410
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 46
40
Thermal Expansion, µm/m-K 12 to 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.0
1.5
Embodied Energy, MJ/kg 28
20
Embodied Water, L/kg 51
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 180
77 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 3590
320 to 840
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22 to 43
19 to 24
Strength to Weight: Bending, points 21 to 32
19 to 22
Thermal Diffusivity, mm2/s 13
11
Thermal Shock Resistance, points 20 to 38
17 to 21

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0.48 to 0.53
0.43 to 0.48
Chromium (Cr), % 0.8 to 1.1
0.35 to 0.55
Iron (Fe), % 96.7 to 97.7
97 to 98
Manganese (Mn), % 0.7 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 0.035
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.040
Vanadium (V), % 0.15 to 0.3
0

Comparable Variants