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S31277 Stainless Steel vs. ZK61A Magnesium

S31277 stainless steel belongs to the iron alloys classification, while ZK61A magnesium belongs to the magnesium alloys. There are 26 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 S31277 stainless steel and the bottom bar is ZK61A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
46
Elongation at Break, % 45
5.8 to 7.1
Fatigue Strength, MPa 380
120 to 140
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
18
Shear Strength, MPa 600
170 to 180
Tensile Strength: Ultimate (UTS), MPa 860
290 to 310
Tensile Strength: Yield (Proof), MPa 410
180 to 200

Thermal Properties

Latent Heat of Fusion, J/g 310
330
Maximum Temperature: Mechanical, °C 1100
120
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1410
530
Specific Heat Capacity, J/kg-K 460
960
Thermal Expansion, µm/m-K 16
27

Otherwise Unclassified Properties

Base Metal Price, % relative 36
13
Density, g/cm3 8.1
1.9
Embodied Carbon, kg CO2/kg material 6.7
23
Embodied Energy, MJ/kg 90
160
Embodied Water, L/kg 220
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 320
15 to 19
Resilience: Unit (Modulus of Resilience), kJ/m3 410
370 to 420
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
62
Strength to Weight: Axial, points 29
42 to 45
Strength to Weight: Bending, points 25
50 to 53
Thermal Shock Resistance, points 19
17 to 18

Alloy Composition

Carbon (C), % 0 to 0.020
0
Chromium (Cr), % 20.5 to 23
0
Copper (Cu), % 0.5 to 1.5
0 to 0.1
Iron (Fe), % 35.5 to 46.2
0
Magnesium (Mg), % 0
92.1 to 93.9
Manganese (Mn), % 0 to 3.0
0
Molybdenum (Mo), % 6.5 to 8.0
0
Nickel (Ni), % 26 to 28
0 to 0.010
Nitrogen (N), % 0.3 to 0.4
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0 to 0.010
0
Zinc (Zn), % 0
5.5 to 6.5
Zirconium (Zr), % 0
0.6 to 1.0
Residuals, % 0
0 to 0.3