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Automotive Grey Cast Iron vs. ASTM A227 Spring Steel

Both automotive grey cast iron and ASTM A227 spring steel are iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is automotive grey cast iron and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 280
500 to 640
Elastic (Young's, Tensile) Modulus, GPa 180
190
Elongation at Break, % 9.6 to 14
12
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 69 to 70
72
Tensile Strength: Ultimate (UTS), MPa 140 to 290
1720 to 2220
Tensile Strength: Yield (Proof), MPa 94 to 200
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
250
Melting Completion (Liquidus), °C 1380 to 1390
1450
Melting Onset (Solidus), °C 1340 to 1350
1410
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 41 to 43
52
Thermal Expansion, µm/m-K 12 to 14
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.1
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9 to 3.0
1.8
Density, g/cm3 7.5 to 7.6
7.8
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
1.4
Embodied Energy, MJ/kg 21 to 24
19
Embodied Water, L/kg 44 to 51
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 25
200 to 260
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 5.2 to 11
61 to 79
Strength to Weight: Bending, points 8.0 to 13
41 to 48
Thermal Diffusivity, mm2/s 11 to 12
14
Thermal Shock Resistance, points 4.2 to 8.6
55 to 71

Comparable Variants