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ACI-ASTM CN7MS Steel vs. SAE-AISI P21 Steel

Both ACI-ASTM CN7MS steel and SAE-AISI P21 steel are iron alloys. They have 55% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7MS steel and the bottom bar is SAE-AISI P21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 540
1130

Thermal Properties

Latent Heat of Fusion, J/g 340
250
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1350
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 12
41
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 28
6.5
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 5.1
2.3
Embodied Energy, MJ/kg 71
32
Embodied Water, L/kg 180
62

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
40
Strength to Weight: Bending, points 19
31
Thermal Diffusivity, mm2/s 3.2
11
Thermal Shock Resistance, points 13
37

Alloy Composition

Carbon (C), % 0 to 0.070
0.18 to 0.22
Chromium (Cr), % 18 to 20
0 to 0.5
Cobalt (Co), % 0
1.1 to 1.3
Copper (Cu), % 1.5 to 2.0
0 to 0.25
Iron (Fe), % 45.4 to 53.5
92.1 to 94.2
Manganese (Mn), % 0 to 1.0
0.35 to 0.72
Molybdenum (Mo), % 2.5 to 3.0
0
Nickel (Ni), % 22 to 25
3.9 to 4.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 2.5 to 3.5
0.2 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0
0.15 to 0.25