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R05255 Alloy vs. S21640 Stainless Steel

R05255 alloy belongs to the otherwise unclassified metals classification, while S21640 stainless steel belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (13, 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 R05255 alloy and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20
46
Poisson's Ratio 0.34
0.28
Shear Modulus, GPa 70
78
Tensile Strength: Ultimate (UTS), MPa 540
740
Tensile Strength: Yield (Proof), MPa 450
350

Thermal Properties

Latent Heat of Fusion, J/g 140
290
Specific Heat Capacity, J/kg-K 140
480
Thermal Conductivity, W/m-K 59
15
Thermal Expansion, µm/m-K 6.6
17

Otherwise Unclassified Properties

Density, g/cm3 17
7.7
Embodied Water, L/kg 630
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
280
Resilience: Unit (Modulus of Resilience), kJ/m3 530
300
Stiffness to Weight: Axial, points 6.3
14
Stiffness to Weight: Bending, points 11
25
Strength to Weight: Axial, points 9.1
27
Strength to Weight: Bending, points 8.9
23
Thermal Diffusivity, mm2/s 25
4.0
Thermal Shock Resistance, points 31
16

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.080
Chromium (Cr), % 0
17.5 to 19.5
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
63 to 74.3
Manganese (Mn), % 0
3.5 to 6.5
Molybdenum (Mo), % 0 to 0.020
0.5 to 2.0
Nickel (Ni), % 0 to 0.010
4.0 to 6.5
Niobium (Nb), % 0 to 0.5
0.1 to 1.0
Nitrogen (N), % 0 to 0.010
0.080 to 0.3
Oxygen (O), % 0 to 0.015
0
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 0 to 0.0050
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 95.9 to 98
0
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 2.0 to 3.5
0