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SAE-AISI M4 Steel vs. ACI-ASTM CN7MS Steel

Both SAE-AISI M4 steel and ACI-ASTM CN7MS steel are iron alloys. They have 57% of their average alloy composition in common. There are 22 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 M4 steel and the bottom bar is ACI-ASTM CN7MS 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 76
77
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
540

Thermal Properties

Latent Heat of Fusion, J/g 260
340
Melting Completion (Liquidus), °C 1610
1400
Melting Onset (Solidus), °C 1560
1350
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 25
12
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 25
28
Density, g/cm3 8.3
7.9
Embodied Carbon, kg CO2/kg material 14
5.1
Embodied Energy, MJ/kg 210
71
Embodied Water, L/kg 110
180

Common Calculations

PREN (Pitting Resistance) 30
28
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 72
19
Strength to Weight: Bending, points 23 to 45
19
Thermal Diffusivity, mm2/s 6.9
3.2
Thermal Shock Resistance, points 24 to 68
13

Alloy Composition

Carbon (C), % 1.3 to 1.4
0 to 0.070
Chromium (Cr), % 3.8 to 4.8
18 to 20
Copper (Cu), % 0 to 0.25
1.5 to 2.0
Iron (Fe), % 75.9 to 81.4
45.4 to 53.5
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 4.3 to 5.5
2.5 to 3.0
Nickel (Ni), % 0 to 0.3
22 to 25
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.45
2.5 to 3.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0