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R05240 Alloy vs. SAE-AISI 4340M Steel

R05240 alloy belongs to the otherwise unclassified metals classification, while SAE-AISI 4340M steel belongs to the iron alloys. There are 18 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

For each property being compared, the top bar is R05240 alloy and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 150
190
Elongation at Break, % 25
6.0
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 57
72
Tensile Strength: Ultimate (UTS), MPa 270
2340
Tensile Strength: Yield (Proof), MPa 170
1240

Thermal Properties

Latent Heat of Fusion, J/g 210
280
Specific Heat Capacity, J/kg-K 190
480
Thermal Expansion, µm/m-K 6.8
13

Otherwise Unclassified Properties

Density, g/cm3 14
7.8
Embodied Water, L/kg 460
55

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 59
120
Resilience: Unit (Modulus of Resilience), kJ/m3 90
4120
Stiffness to Weight: Axial, points 6.3
13
Stiffness to Weight: Bending, points 13
25
Strength to Weight: Axial, points 5.4
84
Strength to Weight: Bending, points 6.8
51
Thermal Shock Resistance, points 18
70

Alloy Composition

Carbon (C), % 0 to 0.010
0.38 to 0.43
Chromium (Cr), % 0
0.7 to 1.0
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
93.3 to 94.8
Manganese (Mn), % 0
0.65 to 0.9
Molybdenum (Mo), % 0 to 0.020
0.35 to 0.45
Nickel (Ni), % 0 to 0.010
1.7 to 2.0
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 0.012
Silicon (Si), % 0 to 0.0050
1.5 to 1.8
Sulfur (S), % 0
0 to 0.012
Tantalum (Ta), % 57.9 to 65
0
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 0 to 0.050
0
Vanadium (V), % 0
0.050 to 0.1