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SAE-AISI 1008 Steel vs. SAE-AISI 4140 Steel

Both SAE-AISI 1008 steel and SAE-AISI 4140 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1008 steel and the bottom bar is SAE-AISI 4140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 93 to 100
200 to 310
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22 to 33
11 to 26
Fatigue Strength, MPa 150 to 220
360 to 650
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 220 to 230
410 to 660
Tensile Strength: Ultimate (UTS), MPa 330 to 370
690 to 1080
Tensile Strength: Yield (Proof), MPa 190 to 310
590 to 990

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
420
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 62
43
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.9
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 7.9
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.4
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 18
20
Embodied Water, L/kg 45
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78 to 91
74 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 92 to 260
920 to 2590
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 12 to 13
25 to 38
Strength to Weight: Bending, points 13 to 15
22 to 30
Thermal Diffusivity, mm2/s 17
12
Thermal Shock Resistance, points 10 to 12
20 to 32

Alloy Composition

Carbon (C), % 0 to 0.1
0.38 to 0.43
Chromium (Cr), % 0
0.8 to 1.1
Iron (Fe), % 99.31 to 99.7
96.8 to 97.8
Manganese (Mn), % 0.3 to 0.5
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0 to 0.050
0 to 0.040

Comparable Variants