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ACI-ASTM CN3MN Steel vs. R05255 Alloy

ACI-ASTM CN3MN steel belongs to the iron alloys classification, while R05255 alloy belongs to the otherwise unclassified metals. There are 20 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 ACI-ASTM CN3MN steel and the bottom bar is R05255 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 39
20
Poisson's Ratio 0.28
0.34
Shear Modulus, GPa 80
70
Tensile Strength: Ultimate (UTS), MPa 620
540
Tensile Strength: Yield (Proof), MPa 300
450

Thermal Properties

Latent Heat of Fusion, J/g 310
140
Specific Heat Capacity, J/kg-K 460
140
Thermal Conductivity, W/m-K 13
59
Thermal Expansion, µm/m-K 16
6.6

Otherwise Unclassified Properties

Density, g/cm3 8.1
17
Embodied Water, L/kg 200
630

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
100
Resilience: Unit (Modulus of Resilience), kJ/m3 210
530
Stiffness to Weight: Axial, points 14
6.3
Stiffness to Weight: Bending, points 24
11
Strength to Weight: Axial, points 21
9.1
Strength to Weight: Bending, points 20
8.9
Thermal Diffusivity, mm2/s 3.4
25
Thermal Shock Resistance, points 14
31

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.010
Chromium (Cr), % 20 to 22
0
Copper (Cu), % 0 to 0.75
0
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 41.4 to 50.3
0 to 0.010
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 6.0 to 7.0
0 to 0.020
Nickel (Ni), % 23.5 to 25.5
0 to 0.010
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0.18 to 0.26
0 to 0.010
Oxygen (O), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.0050
Sulfur (S), % 0 to 0.010
0
Tantalum (Ta), % 0
95.9 to 98
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
2.0 to 3.5