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SAE-AISI 50B60 Steel vs. SAE-AISI 5150 Steel

Both SAE-AISI 50B60 steel and SAE-AISI 5150 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI 50B60 steel and the bottom bar is SAE-AISI 5150 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 190
170
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 20
21
Fatigue Strength, MPa 240 to 330
240
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 380
360
Tensile Strength: Ultimate (UTS), MPa 610 to 630
580
Tensile Strength: Yield (Proof), MPa 350 to 530
350

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
420
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 45
49
Thermal Expansion, µm/m-K 12
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
2.1
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 19
19
Embodied Water, L/kg 48
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 100
110
Resilience: Unit (Modulus of Resilience), kJ/m3 330 to 750
320
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22 to 23
20
Strength to Weight: Bending, points 20 to 21
20
Thermal Diffusivity, mm2/s 12
13
Thermal Shock Resistance, points 20
17

Alloy Composition

Boron (B), % 0.00050 to 0.0030
0
Carbon (C), % 0.56 to 0.64
0.48 to 0.53
Chromium (Cr), % 0.4 to 0.6
0.7 to 0.9
Iron (Fe), % 97.3 to 98.1
97.2 to 98
Manganese (Mn), % 0.75 to 1.0
0.7 to 0.9
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