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SAE-AISI M4 Steel vs. ACI-ASTM CA40F Steel

Both SAE-AISI M4 steel and ACI-ASTM CA40F steel are iron alloys. They have 84% 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 M4 steel and the bottom bar is ACI-ASTM CA40F steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 76
76
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
770

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1610
1430
Melting Onset (Solidus), °C 1560
1390
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 25
27
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 25
7.5
Density, g/cm3 8.3
7.7
Embodied Carbon, kg CO2/kg material 14
2.0
Embodied Energy, MJ/kg 210
28
Embodied Water, L/kg 110
100

Common Calculations

PREN (Pitting Resistance) 30
14
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 72
28
Strength to Weight: Bending, points 23 to 45
24
Thermal Diffusivity, mm2/s 6.9
7.2
Thermal Shock Resistance, points 24 to 68
28

Alloy Composition

Carbon (C), % 1.3 to 1.4
0.2 to 0.4
Chromium (Cr), % 3.8 to 4.8
11.5 to 14
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
81.6 to 88.3
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 4.3 to 5.5
0 to 0.5
Nickel (Ni), % 0 to 0.3
0 to 1.0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.45
0 to 1.5
Sulfur (S), % 0 to 0.030
0.2 to 0.4
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0