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SAE-AISI M4 Steel vs. AWS BVAu-4

SAE-AISI M4 steel belongs to the iron alloys classification, while AWS BVAu-4 belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is SAE-AISI M4 steel and the bottom bar is AWS BVAu-4.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
110
Poisson's Ratio 0.29
0.4
Shear Modulus, GPa 76
41
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
190

Thermal Properties

Latent Heat of Fusion, J/g 260
100
Melting Completion (Liquidus), °C 1610
950
Melting Onset (Solidus), °C 1560
950
Specific Heat Capacity, J/kg-K 440
190
Thermal Expansion, µm/m-K 12
14

Otherwise Unclassified Properties

Density, g/cm3 8.3
17

Common Calculations

Stiffness to Weight: Axial, points 13
3.6
Stiffness to Weight: Bending, points 23
9.3
Strength to Weight: Axial, points 26 to 72
3.0
Strength to Weight: Bending, points 23 to 45
4.2
Thermal Shock Resistance, points 24 to 68
8.7

Alloy Composition

Cadmium (Cd), % 0
0 to 0.0010
Carbon (C), % 1.3 to 1.4
0 to 0.0050
Chromium (Cr), % 3.8 to 4.8
0
Copper (Cu), % 0 to 0.25
0
Gold (Au), % 0
81.5 to 82.5
Iron (Fe), % 75.9 to 81.4
0
Lead (Pb), % 0
0 to 0.0020
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 4.3 to 5.5
0
Nickel (Ni), % 0 to 0.3
17.5 to 18.5
Phosphorus (P), % 0 to 0.030
0 to 0.0020
Silicon (Si), % 0.2 to 0.45
0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0
Zinc (Zn), % 0
0 to 0.0010