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SAE-AISI O2 Steel vs. ASTM Grade HT Steel

Both SAE-AISI O2 steel and ASTM grade HT steel are iron alloys. They have 47% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, 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 HT steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Tensile Strength: Ultimate (UTS), MPa 640 to 2050
500

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Melting Completion (Liquidus), °C 1450
1390
Melting Onset (Solidus), °C 1410
1340
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 43
12
Thermal Expansion, µm/m-K 11
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
31
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.8
5.4
Embodied Energy, MJ/kg 26
76
Embodied Water, L/kg 50
190

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23 to 73
18
Strength to Weight: Bending, points 21 to 46
18
Thermal Diffusivity, mm2/s 12
3.2
Thermal Shock Resistance, points 22 to 70
12

Alloy Composition

Carbon (C), % 0.85 to 1.0
0.35 to 0.75
Chromium (Cr), % 0 to 0.5
15 to 19
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95 to 97.8
38.2 to 51.7
Manganese (Mn), % 1.4 to 1.8
0 to 2.0
Molybdenum (Mo), % 0 to 0.3
0 to 0.5
Nickel (Ni), % 0 to 0.3
33 to 37
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 2.5
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 0 to 0.3
0