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85-platinum 15-iridium vs. AISI 309HCb Stainless Steel

85-platinum 15-iridium belongs to the otherwise unclassified metals classification, while AISI 309HCb stainless steel belongs to the iron alloys. 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 85-platinum 15-iridium and the bottom bar is AISI 309HCb stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 5.5 to 34
46
Poisson's Ratio 0.38
0.28
Shear Modulus, GPa 81
78
Shear Strength, MPa 370 to 420
410
Tensile Strength: Ultimate (UTS), MPa 560 to 730
590

Thermal Properties

Latent Heat of Fusion, J/g 110
300
Melting Completion (Liquidus), °C 1820
1420
Melting Onset (Solidus), °C 1790
1380
Specific Heat Capacity, J/kg-K 130
480
Thermal Expansion, µm/m-K 8.4
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.2
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.5

Otherwise Unclassified Properties

Density, g/cm3 22
7.8

Common Calculations

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

Alloy Composition

Carbon (C), % 0
0.040 to 0.1
Chromium (Cr), % 0
22 to 24
Iridium (Ir), % 14.5 to 15.5
0
Iron (Fe), % 0
56 to 66
Manganese (Mn), % 0
0 to 2.0
Nickel (Ni), % 0
12 to 16
Niobium (Nb), % 0
0 to 1.1
Phosphorus (P), % 0
0 to 0.045
Platinum (Pt), % 84.3 to 85.5
0
Silicon (Si), % 0
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Residuals, % 0 to 0.2
0