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ACI-ASTM CN7M Steel vs. SAE-AISI P20 Steel

Both ACI-ASTM CN7M steel and SAE-AISI P20 steel are iron alloys. They have 46% 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 ACI-ASTM CN7M steel and the bottom bar is SAE-AISI P20 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 480
540 to 1050

Thermal Properties

Latent Heat of Fusion, J/g 310
260
Melting Completion (Liquidus), °C 1410
1460
Melting Onset (Solidus), °C 1450
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 21
45
Thermal Expansion, µm/m-K 15
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 32
2.8
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 5.6
1.6
Embodied Energy, MJ/kg 78
21
Embodied Water, L/kg 210
52

Common Calculations

PREN (Pitting Resistance) 29
2.6
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
19 to 37
Strength to Weight: Bending, points 17
19 to 29
Thermal Diffusivity, mm2/s 5.6
12
Thermal Shock Resistance, points 12
18 to 35

Alloy Composition

Carbon (C), % 0 to 0.070
0.28 to 0.4
Chromium (Cr), % 19 to 22
0.4 to 2.0
Copper (Cu), % 3.0 to 4.0
0 to 0.25
Iron (Fe), % 37.4 to 48.5
95.2 to 98.5
Manganese (Mn), % 0 to 1.5
0.35 to 0.71
Molybdenum (Mo), % 2.0 to 3.0
0.3 to 0.55
Nickel (Ni), % 27.5 to 30.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.5
0.2 to 0.8
Sulfur (S), % 0 to 0.040
0 to 0.030