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AISI 305 Stainless Steel vs. ZK51A Magnesium

AISI 305 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 (5, 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 AISI 305 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, % 34 to 45
4.7
Fatigue Strength, MPa 210 to 280
62
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Shear Strength, MPa 400 to 470
160
Tensile Strength: Ultimate (UTS), MPa 580 to 710
240
Tensile Strength: Yield (Proof), MPa 230 to 350
150

Thermal Properties

Latent Heat of Fusion, J/g 290
340
Maximum Temperature: Mechanical, °C 540
120
Melting Completion (Liquidus), °C 1450
640
Melting Onset (Solidus), °C 1400
550
Specific Heat Capacity, J/kg-K 480
970
Thermal Conductivity, W/m-K 16
110
Thermal Expansion, µm/m-K 17
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
28
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
140

Otherwise Unclassified Properties

Base Metal Price, % relative 16
13
Density, g/cm3 7.8
1.8
Embodied Carbon, kg CO2/kg material 3.2
24
Embodied Energy, MJ/kg 45
160
Embodied Water, L/kg 150
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 210
10
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 320
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
64
Strength to Weight: Axial, points 20 to 25
36
Strength to Weight: Bending, points 20 to 23
47
Thermal Diffusivity, mm2/s 4.2
61
Thermal Shock Resistance, points 13 to 15
15

Alloy Composition

Carbon (C), % 0 to 0.12
0
Chromium (Cr), % 17 to 19
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 65.1 to 72.5
0
Magnesium (Mg), % 0
93.1 to 95.9
Manganese (Mn), % 0 to 2.0
0
Nickel (Ni), % 10.5 to 13
0 to 0.010
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
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