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ACI-ASTM CN7M Steel vs. SAE-AISI T8 Steel

Both ACI-ASTM CN7M steel and SAE-AISI T8 steel are iron alloys. They have 49% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7M steel and the bottom bar is SAE-AISI T8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 480
780 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Melting Completion (Liquidus), °C 1410
1730
Melting Onset (Solidus), °C 1450
1670
Specific Heat Capacity, J/kg-K 470
420
Thermal Conductivity, W/m-K 21
18
Thermal Expansion, µm/m-K 15
12

Otherwise Unclassified Properties

Base Metal Price, % relative 32
45
Density, g/cm3 8.1
9.0
Embodied Carbon, kg CO2/kg material 5.6
10
Embodied Energy, MJ/kg 78
160
Embodied Water, L/kg 210
120

Common Calculations

PREN (Pitting Resistance) 29
30
Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 17
24 to 66
Strength to Weight: Bending, points 17
21 to 41
Thermal Diffusivity, mm2/s 5.6
4.8
Thermal Shock Resistance, points 12
24 to 66

Alloy Composition

Carbon (C), % 0 to 0.070
0.75 to 0.85
Chromium (Cr), % 19 to 22
3.8 to 4.5
Cobalt (Co), % 0
4.3 to 5.8
Copper (Cu), % 3.0 to 4.0
0 to 0.25
Iron (Fe), % 37.4 to 48.5
69.3 to 75.4
Manganese (Mn), % 0 to 1.5
0.2 to 0.4
Molybdenum (Mo), % 2.0 to 3.0
0.4 to 1.0
Nickel (Ni), % 27.5 to 30.5
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.5
0.2 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.030
Tungsten (W), % 0
13.3 to 14.8
Vanadium (V), % 0
1.8 to 2.4