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AISI 429 Stainless Steel vs. Grey Cast Iron

Both AISI 429 stainless steel and grey cast iron are iron alloys. They have 85% of their average alloy composition in common. There are 30 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 AISI 429 stainless steel and the bottom bar is grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
160 to 300
Elastic (Young's, Tensile) Modulus, GPa 200
180
Elongation at Break, % 25
9.6
Fatigue Strength, MPa 180
69 to 170
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
69
Shear Strength, MPa 300
180 to 610
Tensile Strength: Ultimate (UTS), MPa 480
160 to 450
Tensile Strength: Yield (Proof), MPa 260
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Melting Completion (Liquidus), °C 1440
1380
Melting Onset (Solidus), °C 1400
1180
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 26
46
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
1.9
Density, g/cm3 7.7
7.5
Embodied Carbon, kg CO2/kg material 2.0
1.5
Embodied Energy, MJ/kg 28
21
Embodied Water, L/kg 110
44

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 99
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 170
27 to 240
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 17
5.8 to 17
Strength to Weight: Bending, points 18
8.7 to 17
Thermal Diffusivity, mm2/s 6.9
13
Thermal Shock Resistance, points 17
6.0 to 17

Alloy Composition

Carbon (C), % 0 to 0.12
3.1 to 3.4
Chromium (Cr), % 14 to 16
0
Iron (Fe), % 81.8 to 86
92.1 to 93.9
Manganese (Mn), % 0 to 1.0
0.5 to 0.7
Phosphorus (P), % 0 to 0.040
0 to 0.9
Silicon (Si), % 0 to 1.0
2.5 to 2.8
Sulfur (S), % 0 to 0.030
0 to 0.15