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ASTM A227 Spring Steel vs. Nuclear Grade Hafnium

ASTM A227 spring steel belongs to the iron alloys classification, while nuclear grade hafnium belongs to the otherwise unclassified metals. There are 16 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is ASTM A227 spring steel and the bottom bar is nuclear grade hafnium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
78
Elongation at Break, % 12
25
Poisson's Ratio 0.29
0.26
Shear Modulus, GPa 72
31
Tensile Strength: Ultimate (UTS), MPa 1720 to 2220
350
Tensile Strength: Yield (Proof), MPa 1430 to 1850
170

Thermal Properties

Latent Heat of Fusion, J/g 250
130
Specific Heat Capacity, J/kg-K 470
140
Thermal Expansion, µm/m-K 12
5.9

Otherwise Unclassified Properties

Density, g/cm3 7.8
13

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 260
73
Stiffness to Weight: Axial, points 13
3.3
Stiffness to Weight: Bending, points 24
11
Strength to Weight: Axial, points 61 to 79
7.4
Strength to Weight: Bending, points 41 to 48
8.4
Thermal Shock Resistance, points 55 to 71
55

Alloy Composition

Carbon (C), % 0.45 to 0.85
0
Hafnium (Hf), % 0
99.8 to 100
Iron (Fe), % 97.4 to 99.1
0
Manganese (Mn), % 0.3 to 1.3
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.050
0
Residuals, % 0
0 to 0.23