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SAE-AISI O7 Steel vs. SAE-AISI A6 Steel

Both SAE-AISI O7 steel and SAE-AISI A6 steel are iron alloys. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI O7 steel and the bottom bar is SAE-AISI A6 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 680 to 2110
750 to 1990

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1480
1460
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 41
41
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 6.0
3.7
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.3
1.8
Embodied Energy, MJ/kg 33
24
Embodied Water, L/kg 52
57

Common Calculations

PREN (Pitting Resistance) 3.6
4.8
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 74
27 to 71
Strength to Weight: Bending, points 22 to 46
23 to 45
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 23 to 70
25 to 65

Alloy Composition

Carbon (C), % 1.1 to 1.3
0.65 to 0.75
Chromium (Cr), % 0.35 to 0.85
0.9 to 1.2
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 92.9 to 97.6
93 to 95.8
Manganese (Mn), % 0 to 1.0
1.8 to 2.5
Molybdenum (Mo), % 0 to 0.3
0.9 to 1.4
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.6
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.0 to 2.0
0
Vanadium (V), % 0 to 0.4
0

Comparable Variants