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ASTM A229 Spring Steel vs. Nuclear Grade Hafnium

ASTM A229 spring steel belongs to the iron alloys classification, while nuclear grade hafnium belongs to the otherwise unclassified metals. There are 17 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 A229 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, % 14
25
Poisson's Ratio 0.29
0.26
Shear Modulus, GPa 72
31
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
350
Tensile Strength: Yield (Proof), MPa 1100 to 1230
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 230
73
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
180
Stiffness to Weight: Axial, points 13
3.3
Stiffness to Weight: Bending, points 24
11
Strength to Weight: Axial, points 60 to 67
7.4
Strength to Weight: Bending, points 40 to 43
8.4
Thermal Shock Resistance, points 54 to 60
55

Alloy Composition

Carbon (C), % 0.55 to 0.85
0
Hafnium (Hf), % 0
99.8 to 100
Iron (Fe), % 97.5 to 99
0
Manganese (Mn), % 0.3 to 1.2
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