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SAE-AISI M7 Steel vs. ACI-ASTM CF20 Steel

Both SAE-AISI M7 steel and ACI-ASTM CF20 steel are iron alloys. They have 74% 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 SAE-AISI M7 steel and the bottom bar is ACI-ASTM CF20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
530

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1560
1420
Melting Onset (Solidus), °C 1510
1410
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 28
16
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 18
16
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 8.9
3.1
Embodied Energy, MJ/kg 130
44
Embodied Water, L/kg 100
150

Common Calculations

PREN (Pitting Resistance) 35
20
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 76
19
Strength to Weight: Bending, points 23 to 47
19
Thermal Diffusivity, mm2/s 7.8
4.3
Thermal Shock Resistance, points 24 to 69
11

Alloy Composition

Carbon (C), % 1.0 to 1.1
0 to 0.2
Chromium (Cr), % 3.5 to 4.0
18 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 79.8 to 83.8
64.2 to 74
Manganese (Mn), % 0.15 to 0.4
0 to 1.5
Molybdenum (Mo), % 8.2 to 9.2
0
Nickel (Ni), % 0 to 0.3
8.0 to 11
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.55
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 1.4 to 2.1
0
Vanadium (V), % 1.8 to 2.3
0