MakeItFrom.com
Menu (ESC)

SAE-AISI 4150 Steel vs. SAE-AISI 8640 Steel

Both SAE-AISI 4150 steel and SAE-AISI 8640 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI 4150 steel and the bottom bar is SAE-AISI 8640 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 380
170
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 20
23
Fatigue Strength, MPa 260 to 780
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 410 to 800
360
Tensile Strength: Ultimate (UTS), MPa 660 to 1310
570
Tensile Strength: Yield (Proof), MPa 380 to 1220
380

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 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 42
39
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 2.4
2.6
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 51
50

Common Calculations

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

Alloy Composition

Carbon (C), % 0.48 to 0.53
0.38 to 0.43
Chromium (Cr), % 0.8 to 1.1
0.4 to 0.6
Iron (Fe), % 96.7 to 97.7
96.6 to 97.8
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
0.4 to 0.7
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