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SAE-AISI 1008 Steel vs. SAE-AISI 1078 Steel

Both SAE-AISI 1008 steel and SAE-AISI 1078 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 1078 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 93 to 100
220 to 230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22 to 33
11 to 14
Fatigue Strength, MPa 150 to 220
270 to 350
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 470
Tensile Strength: Ultimate (UTS), MPa 330 to 370
730 to 780
Tensile Strength: Yield (Proof), MPa 190 to 310
430 to 570

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
49
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.9
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.9
8.1

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
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78 to 91
77 to 90
Resilience: Unit (Modulus of Resilience), kJ/m3 92 to 260
490 to 860
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 12 to 13
26 to 28
Strength to Weight: Bending, points 13 to 15
23 to 24
Thermal Diffusivity, mm2/s 17
13
Thermal Shock Resistance, points 10 to 12
25 to 26

Alloy Composition

Carbon (C), % 0 to 0.1
0.72 to 0.85
Iron (Fe), % 99.31 to 99.7
98.5 to 99
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