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S21904 Stainless Steel vs. Grey Cast Iron

Both S21904 stainless steel and grey cast iron are iron alloys. They have 65% of their average alloy composition in common. There are 30 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 S21904 stainless steel and the bottom bar is grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
160 to 300
Elastic (Young's, Tensile) Modulus, GPa 200
180
Elongation at Break, % 17 to 51
9.6
Fatigue Strength, MPa 380 to 550
69 to 170
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
69
Shear Strength, MPa 510 to 620
180 to 610
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
160 to 450
Tensile Strength: Yield (Proof), MPa 390 to 910
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Melting Completion (Liquidus), °C 1400
1380
Melting Onset (Solidus), °C 1350
1180
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 14
46
Thermal Expansion, µm/m-K 17
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 15
1.9
Density, g/cm3 7.7
7.5
Embodied Carbon, kg CO2/kg material 3.0
1.5
Embodied Energy, MJ/kg 43
21
Embodied Water, L/kg 160
44

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
27 to 240
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 36
5.8 to 17
Strength to Weight: Bending, points 23 to 29
8.7 to 17
Thermal Diffusivity, mm2/s 3.8
13
Thermal Shock Resistance, points 15 to 21
6.0 to 17

Alloy Composition

Carbon (C), % 0 to 0.040
3.1 to 3.4
Chromium (Cr), % 19 to 21.5
0
Iron (Fe), % 59.5 to 67.4
92.1 to 93.9
Manganese (Mn), % 8.0 to 10
0.5 to 0.7
Nickel (Ni), % 5.5 to 7.5
0
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
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