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SAE-AISI H12 Steel vs. ACI-ASTM CN7M Steel

Both SAE-AISI H12 steel and ACI-ASTM CN7M steel are iron alloys. They have 51% of their average alloy composition in common. There are 24 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 H12 steel and the bottom bar is ACI-ASTM CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 75
77
Tensile Strength: Ultimate (UTS), MPa 690 to 1850
480

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Melting Completion (Liquidus), °C 1480
1410
Melting Onset (Solidus), °C 1440
1450
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 36
21
Thermal Expansion, µm/m-K 12
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
32
Density, g/cm3 7.9
8.1
Embodied Carbon, kg CO2/kg material 2.9
5.6
Embodied Energy, MJ/kg 41
78
Embodied Water, L/kg 76
210

Common Calculations

PREN (Pitting Resistance) 12
29
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 65
17
Strength to Weight: Bending, points 22 to 42
17
Thermal Diffusivity, mm2/s 9.8
5.6
Thermal Shock Resistance, points 22 to 60
12

Alloy Composition

Carbon (C), % 0.3 to 0.4
0 to 0.070
Chromium (Cr), % 4.8 to 5.5
19 to 22
Copper (Cu), % 0 to 0.25
3.0 to 4.0
Iron (Fe), % 87.8 to 91.7
37.4 to 48.5
Manganese (Mn), % 0.2 to 0.5
0 to 1.5
Molybdenum (Mo), % 1.3 to 1.8
2.0 to 3.0
Nickel (Ni), % 0 to 0.3
27.5 to 30.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.8 to 1.2
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 1.0 to 1.7
0
Vanadium (V), % 0 to 0.5
0