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SAE-AISI 1008 Steel vs. SAE-AISI 1055 Steel

Both SAE-AISI 1008 steel and SAE-AISI 1055 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 1055 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 93 to 100
220
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22 to 33
11 to 14
Fatigue Strength, MPa 150 to 220
260 to 390
Poisson's Ratio 0.29
0.29
Reduction in Area, % 50 to 63
34 to 45
Shear Modulus, GPa 73
72
Shear Strength, MPa 220 to 230
440 to 450
Tensile Strength: Ultimate (UTS), MPa 330 to 370
730 to 750
Tensile Strength: Yield (Proof), MPa 190 to 310
400 to 630

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
51
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
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 18
18
Embodied Water, L/kg 45
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78 to 91
80 to 85
Resilience: Unit (Modulus of Resilience), kJ/m3 92 to 260
440 to 1070
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 12 to 13
26
Strength to Weight: Bending, points 13 to 15
23
Thermal Diffusivity, mm2/s 17
14
Thermal Shock Resistance, points 10 to 12
23 to 24

Alloy Composition

Carbon (C), % 0 to 0.1
0.5 to 0.6
Iron (Fe), % 99.31 to 99.7
98.4 to 98.9
Manganese (Mn), % 0.3 to 0.5
0.6 to 0.9
Phosphorus (P), % 0 to 0.040
0 to 0.040
Sulfur (S), % 0 to 0.050
0 to 0.050

Comparable Variants