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SAE-AISI O2 Steel vs. ASTM Grade HD Steel

Both SAE-AISI O2 steel and ASTM grade HD steel are iron alloys. They have 66% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O2 steel and the bottom bar is ASTM grade HD steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 72
80
Tensile Strength: Ultimate (UTS), MPa 640 to 2050
590

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Melting Completion (Liquidus), °C 1450
1410
Melting Onset (Solidus), °C 1410
1370
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 43
16
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.8
3.1
Embodied Energy, MJ/kg 26
45
Embodied Water, L/kg 50
180

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 23 to 73
21
Strength to Weight: Bending, points 21 to 46
20
Thermal Diffusivity, mm2/s 12
4.3
Thermal Shock Resistance, points 22 to 70
19

Alloy Composition

Carbon (C), % 0.85 to 1.0
0 to 0.5
Chromium (Cr), % 0 to 0.5
26 to 30
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95 to 97.8
58.4 to 70
Manganese (Mn), % 1.4 to 1.8
0 to 1.5
Molybdenum (Mo), % 0 to 0.3
0 to 0.5
Nickel (Ni), % 0 to 0.3
4.0 to 7.0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 0 to 0.3
0