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ASTM Grade HH Steel vs. SAE-AISI O2 Steel

Both ASTM grade HH steel and SAE-AISI O2 steel are iron alloys. They have 61% 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 ASTM grade HH steel and the bottom bar is SAE-AISI O2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
72
Tensile Strength: Ultimate (UTS), MPa 580
640 to 2050

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1360
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
43
Thermal Expansion, µm/m-K 17
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 20
2.4
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.7
1.8
Embodied Energy, MJ/kg 53
26
Embodied Water, L/kg 180
50

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
23 to 73
Strength to Weight: Bending, points 20
21 to 46
Thermal Diffusivity, mm2/s 3.8
12
Thermal Shock Resistance, points 12
22 to 70

Alloy Composition

Carbon (C), % 0.2 to 0.5
0.85 to 1.0
Chromium (Cr), % 24 to 28
0 to 0.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 52.9 to 64.8
95 to 97.8
Manganese (Mn), % 0 to 2.0
1.4 to 1.8
Molybdenum (Mo), % 0 to 0.5
0 to 0.3
Nickel (Ni), % 11 to 14
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.030
Vanadium (V), % 0
0 to 0.3