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AISI 305 Stainless Steel vs. 85-platinum 15-iridium

AISI 305 stainless steel belongs to the iron alloys classification, while 85-platinum 15-iridium belongs to the otherwise unclassified metals. There are 19 material properties with values for both materials. Properties with values for just one material (15, 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 85-platinum 15-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 34 to 45
5.5 to 34
Poisson's Ratio 0.28
0.38
Shear Modulus, GPa 77
81
Shear Strength, MPa 400 to 470
370 to 420
Tensile Strength: Ultimate (UTS), MPa 580 to 710
560 to 730

Thermal Properties

Latent Heat of Fusion, J/g 290
110
Melting Completion (Liquidus), °C 1450
1820
Melting Onset (Solidus), °C 1400
1790
Specific Heat Capacity, J/kg-K 480
130
Thermal Expansion, µm/m-K 17
8.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
6.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.6

Otherwise Unclassified Properties

Density, g/cm3 7.8
22

Common Calculations

Stiffness to Weight: Axial, points 14
5.7
Stiffness to Weight: Bending, points 25
9.3
Strength to Weight: Axial, points 20 to 25
7.1 to 9.3
Strength to Weight: Bending, points 20 to 23
6.9 to 8.3
Thermal Shock Resistance, points 13 to 15
21 to 28

Alloy Composition

Carbon (C), % 0 to 0.12
0
Chromium (Cr), % 17 to 19
0
Iridium (Ir), % 0
14.5 to 15.5
Iron (Fe), % 65.1 to 72.5
0
Manganese (Mn), % 0 to 2.0
0
Nickel (Ni), % 10.5 to 13
0
Phosphorus (P), % 0 to 0.045
0
Platinum (Pt), % 0
84.3 to 85.5
Silicon (Si), % 0 to 0.75
0
Sulfur (S), % 0 to 0.030
0
Residuals, % 0
0 to 0.2

Comparable Variants