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AISI 334 Stainless Steel vs. AZ91B Magnesium

AISI 334 stainless steel belongs to the iron alloys classification, while AZ91B magnesium belongs to the magnesium 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 AISI 334 stainless steel and the bottom bar is AZ91B magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
63
Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 34
5.0
Fatigue Strength, MPa 150
79
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Shear Strength, MPa 360
140
Tensile Strength: Ultimate (UTS), MPa 540
240
Tensile Strength: Yield (Proof), MPa 190
160

Thermal Properties

Latent Heat of Fusion, J/g 290
360
Maximum Temperature: Mechanical, °C 1000
130
Melting Completion (Liquidus), °C 1410
600
Melting Onset (Solidus), °C 1370
470
Specific Heat Capacity, J/kg-K 480
990
Thermal Expansion, µm/m-K 16
26

Otherwise Unclassified Properties

Base Metal Price, % relative 22
12
Density, g/cm3 7.9
1.7
Embodied Carbon, kg CO2/kg material 4.1
22
Embodied Energy, MJ/kg 59
160
Embodied Water, L/kg 170
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
11
Resilience: Unit (Modulus of Resilience), kJ/m3 96
280
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 19
38
Strength to Weight: Bending, points 19
49
Thermal Shock Resistance, points 12
14

Alloy Composition

Aluminum (Al), % 0.15 to 0.6
8.3 to 9.7
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 18 to 20
0
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 55.7 to 62.7
0
Magnesium (Mg), % 0
87.9 to 91.2
Manganese (Mn), % 0 to 1.0
0.13 to 0.5
Nickel (Ni), % 19 to 21
0 to 0.030
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0.15 to 0.6
0
Zinc (Zn), % 0
0.35 to 1.0