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AZ91A Magnesium vs. S31730 Stainless Steel

AZ91A magnesium belongs to the magnesium alloys classification, while S31730 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (9, 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 AZ91A magnesium and the bottom bar is S31730 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
180
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
40
Fatigue Strength, MPa 99
170
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
77
Shear Strength, MPa 140
370
Tensile Strength: Ultimate (UTS), MPa 240
540
Tensile Strength: Yield (Proof), MPa 160
200

Thermal Properties

Latent Heat of Fusion, J/g 360
290
Maximum Temperature: Mechanical, °C 130
990
Melting Completion (Liquidus), °C 600
1430
Melting Onset (Solidus), °C 470
1390
Specific Heat Capacity, J/kg-K 990
470
Thermal Expansion, µm/m-K 26
16

Otherwise Unclassified Properties

Base Metal Price, % relative 12
24
Density, g/cm3 1.7
8.0
Embodied Carbon, kg CO2/kg material 22
4.6
Embodied Energy, MJ/kg 160
63
Embodied Water, L/kg 990
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
170
Resilience: Unit (Modulus of Resilience), kJ/m3 280
99
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
19
Strength to Weight: Bending, points 49
18
Thermal Shock Resistance, points 14
12

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
17 to 19
Copper (Cu), % 0 to 0.1
4.0 to 5.0
Iron (Fe), % 0
52.4 to 61
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 2.0
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 0 to 0.030
15 to 16.5
Nitrogen (N), % 0
0 to 0.045
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Zinc (Zn), % 0.35 to 1.0
0