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ASTM Grade HN Steel vs. R05255 Alloy

ASTM grade HN steel belongs to the iron alloys classification, while R05255 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (12, 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 ASTM grade HN steel and the bottom bar is R05255 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 9.0
20
Poisson's Ratio 0.28
0.34
Shear Modulus, GPa 77
70
Tensile Strength: Ultimate (UTS), MPa 500
540

Thermal Properties

Latent Heat of Fusion, J/g 310
140
Specific Heat Capacity, J/kg-K 480
140
Thermal Conductivity, W/m-K 13
59
Thermal Expansion, µm/m-K 16
6.6

Otherwise Unclassified Properties

Density, g/cm3 7.9
17
Embodied Water, L/kg 180
630

Common Calculations

Stiffness to Weight: Axial, points 14
6.3
Stiffness to Weight: Bending, points 25
11
Strength to Weight: Axial, points 17
9.1
Strength to Weight: Bending, points 18
8.9
Thermal Diffusivity, mm2/s 3.5
25
Thermal Shock Resistance, points 11
31

Alloy Composition

Carbon (C), % 0.2 to 0.5
0 to 0.010
Chromium (Cr), % 19 to 23
0
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 44.9 to 57.8
0 to 0.010
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 0 to 0.5
0 to 0.020
Nickel (Ni), % 23 to 27
0 to 0.010
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0
0 to 0.010
Oxygen (O), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 0.0050
Sulfur (S), % 0 to 0.040
0
Tantalum (Ta), % 0
95.9 to 98
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
2.0 to 3.5