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ASTM A387 Grade 21 Steel vs. R05240 Alloy

ASTM A387 grade 21 steel belongs to the iron alloys classification, while R05240 alloy belongs to the otherwise unclassified metals. 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 ASTM A387 grade 21 steel and the bottom bar is R05240 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
150
Elongation at Break, % 21
25
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 74
57
Tensile Strength: Ultimate (UTS), MPa 500 to 590
270
Tensile Strength: Yield (Proof), MPa 230 to 350
170

Thermal Properties

Latent Heat of Fusion, J/g 260
210
Specific Heat Capacity, J/kg-K 470
190
Thermal Expansion, µm/m-K 13
6.8

Otherwise Unclassified Properties

Density, g/cm3 7.9
14
Embodied Water, L/kg 62
460

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
59
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
90
Stiffness to Weight: Axial, points 13
6.3
Stiffness to Weight: Bending, points 24
13
Strength to Weight: Axial, points 18 to 21
5.4
Strength to Weight: Bending, points 18 to 20
6.8
Thermal Shock Resistance, points 14 to 17
18

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.010
Chromium (Cr), % 2.8 to 3.3
0
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 94.4 to 96
0 to 0.010
Manganese (Mn), % 0.3 to 0.6
0
Molybdenum (Mo), % 0.9 to 1.1
0 to 0.020
Nickel (Ni), % 0
0 to 0.010
Niobium (Nb), % 0
35 to 42
Nitrogen (N), % 0
0 to 0.010
Oxygen (O), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0 to 0.0050
Sulfur (S), % 0 to 0.025
0
Tantalum (Ta), % 0
57.9 to 65
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
0 to 0.050