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SAE-AISI 8642 Steel vs. SAE-AISI 4150 Steel

Both SAE-AISI 8642 steel and SAE-AISI 4150 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI 8642 steel and the bottom bar is SAE-AISI 4150 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
200 to 380
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 23
12 to 20
Fatigue Strength, MPa 270
260 to 780
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 370
410 to 800
Tensile Strength: Ultimate (UTS), MPa 580
660 to 1310
Tensile Strength: Yield (Proof), MPa 380
380 to 1220

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
42
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 50
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
82 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 390
380 to 3930
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20
24 to 47
Strength to Weight: Bending, points 20
22 to 34
Thermal Diffusivity, mm2/s 10
11
Thermal Shock Resistance, points 17
19 to 39

Alloy Composition

Carbon (C), % 0.4 to 0.45
0.48 to 0.53
Chromium (Cr), % 0.4 to 0.6
0.8 to 1.1
Iron (Fe), % 96.6 to 97.8
96.7 to 97.7
Manganese (Mn), % 0.75 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
0.15 to 0.25
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