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Hardened AISI 422 vs. Hardened SAE-AISI O2

Both hardened AISI 422 and hardened SAE-AISI O2 are iron alloys. Both are furnished in the hardened (H) condition. They have 86% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is hardened AISI 422 and the bottom bar is hardened SAE-AISI O2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Rockwell C Hardness 21
63
Shear Modulus, GPa 76
72
Tensile Strength: Ultimate (UTS), MPa 910
2050

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Melting Completion (Liquidus), °C 1480
1450
Melting Onset (Solidus), °C 1470
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 24
43
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 4.7
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 5.3
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 11
2.4
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 3.1
1.8
Embodied Energy, MJ/kg 44
26
Embodied Water, L/kg 100
50

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32
73
Strength to Weight: Bending, points 26
46
Thermal Diffusivity, mm2/s 6.4
12
Thermal Shock Resistance, points 33
70

Alloy Composition

Carbon (C), % 0.2 to 0.25
0.85 to 1.0
Chromium (Cr), % 11 to 12.5
0 to 0.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 81.9 to 85.8
95 to 97.8
Manganese (Mn), % 0.5 to 1.0
1.4 to 1.8
Molybdenum (Mo), % 0.9 to 1.3
0 to 0.3
Nickel (Ni), % 0.5 to 1.0
0 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.030
Tungsten (W), % 0.9 to 1.3
0
Vanadium (V), % 0.2 to 0.3
0 to 0.3