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90-platinum 10-iridium vs. EN 1.5511 Steel

90-platinum 10-iridium belongs to the otherwise unclassified metals classification, while EN 1.5511 steel belongs to the iron alloys. There are 13 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 90-platinum 10-iridium and the bottom bar is EN 1.5511 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.38
0.29
Shear Modulus, GPa 74
72
Tensile Strength: Ultimate (UTS), MPa 330 to 550
490 to 580

Thermal Properties

Latent Heat of Fusion, J/g 100
250
Specific Heat Capacity, J/kg-K 130
470
Thermal Expansion, µm/m-K 8.6
13

Otherwise Unclassified Properties

Density, g/cm3 22
7.8

Common Calculations

Stiffness to Weight: Axial, points 5.3
13
Stiffness to Weight: Bending, points 9.1
24
Strength to Weight: Axial, points 4.2 to 7.1
17 to 20
Strength to Weight: Bending, points 4.9 to 6.9
18 to 20
Thermal Shock Resistance, points 13 to 22
15 to 17

Alloy Composition

Aluminum (Al), % 0
0.020 to 0.060
Boron (B), % 0
0.00080 to 0.0050
Carbon (C), % 0
0.32 to 0.39
Iridium (Ir), % 9.5 to 10.5
0
Iron (Fe), % 0
98.3 to 99.159
Manganese (Mn), % 0
0.5 to 0.8
Phosphorus (P), % 0
0 to 0.030
Platinum (Pt), % 89.3 to 90.5
0
Silicon (Si), % 0
0 to 0.4
Sulfur (S), % 0
0 to 0.015
Residuals, % 0 to 0.2
0