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EN 1.3956 Stainless Steel vs. ZK40A Magnesium

EN 1.3956 stainless steel belongs to the iron alloys classification, while ZK40A magnesium belongs to the magnesium alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, 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 EN 1.3956 stainless steel and the bottom bar is ZK40A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 27
4.2
Fatigue Strength, MPa 240
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
17
Tensile Strength: Ultimate (UTS), MPa 650
280
Tensile Strength: Yield (Proof), MPa 330
260

Thermal Properties

Latent Heat of Fusion, J/g 300
340
Maximum Temperature: Mechanical, °C 1080
120
Melting Completion (Liquidus), °C 1420
600
Melting Onset (Solidus), °C 1380
540
Specific Heat Capacity, J/kg-K 480
970
Thermal Expansion, µm/m-K 13
26

Otherwise Unclassified Properties

Base Metal Price, % relative 22
13
Density, g/cm3 7.8
1.8
Embodied Carbon, kg CO2/kg material 4.8
24
Embodied Energy, MJ/kg 68
160
Embodied Water, L/kg 180
950

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
12
Resilience: Unit (Modulus of Resilience), kJ/m3 270
740
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
65
Strength to Weight: Axial, points 23
43
Strength to Weight: Bending, points 21
53
Thermal Shock Resistance, points 18
17

Alloy Composition

Carbon (C), % 0 to 0.060
0
Chromium (Cr), % 20.5 to 23.5
0
Iron (Fe), % 51.9 to 62.1
0
Magnesium (Mg), % 0
94.2 to 96.1
Manganese (Mn), % 4.0 to 6.0
0
Molybdenum (Mo), % 1.5 to 3.0
0
Nickel (Ni), % 11.5 to 13.5
0
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 0.1 to 0.3
0
Zinc (Zn), % 0
3.5 to 4.5
Zirconium (Zr), % 0
0.45 to 1.0
Residuals, % 0
0 to 0.3