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SAE-AISI O7 Steel vs. SAE-AISI H42 Steel

Both SAE-AISI O7 steel and SAE-AISI H42 steel are iron alloys. They have 85% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O7 steel and the bottom bar is SAE-AISI H42 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 680 to 2110
700 to 1980

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Melting Completion (Liquidus), °C 1480
1620
Melting Onset (Solidus), °C 1430
1570
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 41
24
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 6.0
24
Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 2.3
8.8
Embodied Energy, MJ/kg 33
130
Embodied Water, L/kg 52
98

Common Calculations

PREN (Pitting Resistance) 3.6
31
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 24 to 74
23 to 65
Strength to Weight: Bending, points 22 to 46
21 to 42
Thermal Diffusivity, mm2/s 11
6.5
Thermal Shock Resistance, points 23 to 70
20 to 57

Alloy Composition

Carbon (C), % 1.1 to 1.3
0.55 to 0.7
Chromium (Cr), % 0.35 to 0.85
3.8 to 4.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 92.9 to 97.6
79.3 to 83.8
Manganese (Mn), % 0 to 1.0
0.15 to 0.4
Molybdenum (Mo), % 0 to 0.3
4.5 to 5.5
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
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.0 to 2.0
5.5 to 6.8
Vanadium (V), % 0 to 0.4
1.8 to 2.2

Comparable Variants