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Grade 705C Zirconium vs. ASTM A227 Spring Steel

Grade 705C zirconium belongs to the otherwise unclassified metals classification, while ASTM A227 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 grade 705C zirconium and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
500 to 640
Elastic (Young's, Tensile) Modulus, GPa 98
190
Elongation at Break, % 13
12
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 36
72
Tensile Strength: Ultimate (UTS), MPa 540
1720 to 2220
Tensile Strength: Yield (Proof), MPa 390
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Specific Heat Capacity, J/kg-K 270
470
Thermal Conductivity, W/m-K 18
52
Thermal Expansion, µm/m-K 5.7
12

Otherwise Unclassified Properties

Density, g/cm3 6.7
7.8
Embodied Water, L/kg 450
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 66
200 to 260
Stiffness to Weight: Axial, points 8.1
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 22
61 to 79
Strength to Weight: Bending, points 22
41 to 48
Thermal Diffusivity, mm2/s 9.9
14
Thermal Shock Resistance, points 69
55 to 71

Alloy Composition

Carbon (C), % 0 to 0.1
0.45 to 0.85
Hafnium (Hf), % 0 to 4.5
0
Hydrogen (H), % 0 to 0.0050
0
Iron (Fe), % 0 to 0.3
97.4 to 99.1
Manganese (Mn), % 0
0.3 to 1.3
Niobium (Nb), % 2.0 to 3.0
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.010
0 to 0.040
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.050
Zirconium (Zr), % 91.9 to 98
0