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Grey Cast Iron vs. AISI 445 Stainless Steel

Both grey cast iron and AISI 445 stainless steel are iron alloys. They have 79% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is grey cast iron and the bottom bar is AISI 445 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 300
160
Elastic (Young's, Tensile) Modulus, GPa 180
200
Elongation at Break, % 9.6
25
Fatigue Strength, MPa 69 to 170
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 69
78
Shear Strength, MPa 180 to 610
310
Tensile Strength: Ultimate (UTS), MPa 160 to 450
480
Tensile Strength: Yield (Proof), MPa 98 to 290
230

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1380
1440
Melting Onset (Solidus), °C 1180
1390
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 46
21
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
12
Density, g/cm3 7.5
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.6
Embodied Energy, MJ/kg 21
38
Embodied Water, L/kg 44
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 37
98
Resilience: Unit (Modulus of Resilience), kJ/m3 27 to 240
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 5.8 to 17
17
Strength to Weight: Bending, points 8.7 to 17
18
Thermal Diffusivity, mm2/s 13
5.6
Thermal Shock Resistance, points 6.0 to 17
16

Alloy Composition

Carbon (C), % 3.1 to 3.4
0 to 0.020
Chromium (Cr), % 0
19 to 21
Copper (Cu), % 0
0.3 to 0.6
Iron (Fe), % 92.1 to 93.9
74.9 to 80.7
Manganese (Mn), % 0.5 to 0.7
0 to 1.0
Nickel (Ni), % 0
0 to 0.6
Niobium (Nb), % 0
0 to 0.8
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.9
0 to 0.040
Silicon (Si), % 2.5 to 2.8
0 to 1.0
Sulfur (S), % 0 to 0.15
0 to 0.012