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Automotive Grey Cast Iron vs. S44725 Stainless Steel

Both automotive grey cast iron and S44725 stainless steel are iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is automotive grey cast iron and the bottom bar is S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 280
180
Elastic (Young's, Tensile) Modulus, GPa 180
200
Elongation at Break, % 9.6 to 14
22
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 69 to 70
81
Tensile Strength: Ultimate (UTS), MPa 140 to 290
500
Tensile Strength: Yield (Proof), MPa 94 to 200
310

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
290
Melting Completion (Liquidus), °C 1380 to 1390
1450
Melting Onset (Solidus), °C 1340 to 1350
1410
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 41 to 43
17
Thermal Expansion, µm/m-K 12 to 14
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.1
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9 to 3.0
15
Density, g/cm3 7.5 to 7.6
7.7
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
3.1
Embodied Energy, MJ/kg 21 to 24
44
Embodied Water, L/kg 44 to 51
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 25
99
Resilience: Unit (Modulus of Resilience), kJ/m3 25 to 110
240
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 5.2 to 11
18
Strength to Weight: Bending, points 8.0 to 13
18
Thermal Diffusivity, mm2/s 11 to 12
4.6
Thermal Shock Resistance, points 4.2 to 8.6
16