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R05240 Alloy vs. ASTM A387 Grade 12 Steel

R05240 alloy belongs to the otherwise unclassified metals classification, while ASTM A387 grade 12 steel belongs to the iron alloys. There are 18 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is R05240 alloy and the bottom bar is ASTM A387 grade 12 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 150
190
Elongation at Break, % 25
25
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 57
73
Tensile Strength: Ultimate (UTS), MPa 270
470 to 520
Tensile Strength: Yield (Proof), MPa 170
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 210
250
Specific Heat Capacity, J/kg-K 190
470
Thermal Expansion, µm/m-K 6.8
13

Otherwise Unclassified Properties

Density, g/cm3 14
7.8
Embodied Water, L/kg 460
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 59
98 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 90
180 to 250
Stiffness to Weight: Axial, points 6.3
13
Stiffness to Weight: Bending, points 13
24
Strength to Weight: Axial, points 5.4
16 to 18
Strength to Weight: Bending, points 6.8
17 to 18
Thermal Shock Resistance, points 18
14 to 15

Alloy Composition

Carbon (C), % 0 to 0.010
0.050 to 0.17
Chromium (Cr), % 0
0.8 to 1.2
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
97 to 98.2
Manganese (Mn), % 0
0.4 to 0.65
Molybdenum (Mo), % 0 to 0.020
0.45 to 0.6
Nickel (Ni), % 0 to 0.010
0
Niobium (Nb), % 35 to 42
0
Nitrogen (N), % 0 to 0.010
0
Oxygen (O), % 0 to 0.020
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.0050
0.15 to 0.4
Sulfur (S), % 0
0 to 0.025
Tantalum (Ta), % 57.9 to 65
0
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 0 to 0.050
0