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SAE-AISI 8740 Steel vs. SAE-AISI 50B60 Steel

Both SAE-AISI 8740 steel and SAE-AISI 50B60 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is SAE-AISI 50B60 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 200
180 to 190
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 23
12 to 20
Fatigue Strength, MPa 270 to 350
240 to 330
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Shear Strength, MPa 370 to 400
380
Tensile Strength: Ultimate (UTS), MPa 580 to 670
610 to 630
Tensile Strength: Yield (Proof), MPa 380 to 570
350 to 530

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
410
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
45
Thermal Expansion, µm/m-K 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 2.6
2.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 20
19
Embodied Water, L/kg 50
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
71 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
330 to 750
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20 to 24
22 to 23
Strength to Weight: Bending, points 20 to 22
20 to 21
Thermal Diffusivity, mm2/s 10
12
Thermal Shock Resistance, points 17 to 20
20

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0.38 to 0.43
0.56 to 0.64
Chromium (Cr), % 0.4 to 0.6
0.4 to 0.6
Iron (Fe), % 96.5 to 97.7
97.3 to 98.1
Manganese (Mn), % 0.75 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 0.4 to 0.7
0
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

Comparable Variants