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S45000 Stainless Steel vs. ZK51A Magnesium

S45000 stainless steel belongs to the iron alloys classification, while ZK51A magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (6, 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 S45000 stainless steel and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 6.8 to 14
4.7
Fatigue Strength, MPa 330 to 650
62
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
18
Shear Strength, MPa 590 to 830
160
Tensile Strength: Ultimate (UTS), MPa 980 to 1410
240
Tensile Strength: Yield (Proof), MPa 580 to 1310
150

Thermal Properties

Latent Heat of Fusion, J/g 280
340
Maximum Temperature: Mechanical, °C 840
120
Melting Completion (Liquidus), °C 1440
640
Melting Onset (Solidus), °C 1390
550
Specific Heat Capacity, J/kg-K 480
970
Thermal Conductivity, W/m-K 17
110
Thermal Expansion, µm/m-K 11
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
28
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
140

Otherwise Unclassified Properties

Base Metal Price, % relative 13
13
Density, g/cm3 7.8
1.8
Embodied Carbon, kg CO2/kg material 2.8
24
Embodied Energy, MJ/kg 39
160
Embodied Water, L/kg 130
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 94 to 160
10
Resilience: Unit (Modulus of Resilience), kJ/m3 850 to 4400
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
64
Strength to Weight: Axial, points 35 to 50
36
Strength to Weight: Bending, points 28 to 36
47
Thermal Diffusivity, mm2/s 4.5
61
Thermal Shock Resistance, points 33 to 47
15

Alloy Composition

Carbon (C), % 0 to 0.050
0
Chromium (Cr), % 14 to 16
0
Copper (Cu), % 1.3 to 1.8
0 to 0.1
Iron (Fe), % 72.1 to 79.3
0
Magnesium (Mg), % 0
93.1 to 95.9
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0.5 to 1.0
0
Nickel (Ni), % 5.0 to 7.0
0 to 0.010
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3