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R60705 Alloy vs. ASTM A232 Spring Steel

R60705 alloy belongs to the otherwise unclassified metals classification, while ASTM A232 spring steel belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R60705 alloy and the bottom bar is ASTM A232 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 98
190
Elongation at Break, % 18
14
Fatigue Strength, MPa 290
1040
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 37
73
Tensile Strength: Ultimate (UTS), MPa 540
1790
Tensile Strength: Yield (Proof), MPa 430
1610

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Specific Heat Capacity, J/kg-K 270
470
Thermal Conductivity, W/m-K 17
52
Thermal Expansion, µm/m-K 6.3
13

Otherwise Unclassified Properties

Density, g/cm3 6.7
7.8
Embodied Water, L/kg 450
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 90
250
Stiffness to Weight: Axial, points 8.1
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 22
64
Strength to Weight: Bending, points 22
42
Thermal Diffusivity, mm2/s 9.5
14
Thermal Shock Resistance, points 63
53

Alloy Composition

Carbon (C), % 0 to 0.050
0.48 to 0.53
Chromium (Cr), % 0 to 0.2
0.8 to 1.1
Hafnium (Hf), % 0 to 4.5
0
Hydrogen (H), % 0 to 0.0050
0
Iron (Fe), % 0 to 0.2
96.8 to 97.7
Manganese (Mn), % 0
0.7 to 0.9
Niobium (Nb), % 2.0 to 3.0
0
Nitrogen (N), % 0 to 0.025
0
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.035
Vanadium (V), % 0
0.15 to 0.3
Zirconium (Zr), % 91 to 98
0