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SAE-AISI 1070 Steel vs. SAE-AISI 1055 Steel

Both SAE-AISI 1070 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 1070 steel and the bottom bar is SAE-AISI 1055 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 230
220
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 10 to 13
11 to 14
Fatigue Strength, MPa 270 to 350
260 to 390
Poisson's Ratio 0.29
0.29
Reduction in Area, % 34 to 51
34 to 45
Shear Modulus, GPa 72
72
Shear Strength, MPa 380 to 460
440 to 450
Tensile Strength: Ultimate (UTS), MPa 640 to 760
730 to 750
Tensile Strength: Yield (Proof), MPa 420 to 560
400 to 630

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
400
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 50
51
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
11
Electrical Conductivity: Equal Weight (Specific), % IACS 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 19
18
Embodied Water, L/kg 46
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 59 to 86
80 to 85
Resilience: Unit (Modulus of Resilience), kJ/m3 470 to 850
440 to 1070
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23 to 27
26
Strength to Weight: Bending, points 21 to 24
23
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 21 to 25
23 to 24

Alloy Composition

Carbon (C), % 0.65 to 0.75
0.5 to 0.6
Iron (Fe), % 98.3 to 98.8
98.4 to 98.9
Manganese (Mn), % 0.6 to 0.9
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