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SAE-AISI 1008 Steel vs. SAE-AISI 1020 Steel

Both SAE-AISI 1008 steel and SAE-AISI 1020 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI 1008 steel and the bottom bar is SAE-AISI 1020 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 93 to 100
120 to 130
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22 to 33
17 to 28
Fatigue Strength, MPa 150 to 220
180 to 250
Poisson's Ratio 0.29
0.29
Reduction in Area, % 50 to 63
45 to 57
Shear Modulus, GPa 73
73
Shear Strength, MPa 220 to 230
280
Tensile Strength: Ultimate (UTS), MPa 330 to 370
430 to 460
Tensile Strength: Yield (Proof), MPa 190 to 310
240 to 380

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
400
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
52
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.9
11
Electrical Conductivity: Equal Weight (Specific), % IACS 7.9
12

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78 to 91
72 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 92 to 260
150 to 380
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 12 to 13
15 to 16
Strength to Weight: Bending, points 13 to 15
16 to 17
Thermal Diffusivity, mm2/s 17
14
Thermal Shock Resistance, points 10 to 12
13 to 14

Alloy Composition

Carbon (C), % 0 to 0.1
0.18 to 0.23
Iron (Fe), % 99.31 to 99.7
99.08 to 99.52
Manganese (Mn), % 0.3 to 0.5
0.3 to 0.6
Phosphorus (P), % 0 to 0.040
0 to 0.040
Sulfur (S), % 0 to 0.050
0 to 0.050

Comparable Variants