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Ductile Cast Iron vs. S15500 Stainless Steel

Both ductile cast iron and S15500 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ductile cast iron and the bottom bar is S15500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 310
290 to 430
Elastic (Young's, Tensile) Modulus, GPa 170 to 180
190
Elongation at Break, % 2.1 to 20
6.8 to 16
Poisson's Ratio 0.28 to 0.31
0.28
Shear Modulus, GPa 64 to 70
75
Shear Strength, MPa 420 to 800
540 to 870
Tensile Strength: Ultimate (UTS), MPa 460 to 920
890 to 1490
Tensile Strength: Yield (Proof), MPa 310 to 670
590 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Mechanical, °C 290
820
Melting Completion (Liquidus), °C 1160
1430
Melting Onset (Solidus), °C 1120
1380
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 31 to 36
17
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
13
Density, g/cm3 7.1 to 7.5
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.7
Embodied Energy, MJ/kg 21
39
Embodied Water, L/kg 43
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17 to 80
98 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 280 to 1330
890 to 4460
Stiffness to Weight: Axial, points 12 to 14
14
Stiffness to Weight: Bending, points 24 to 26
25
Strength to Weight: Axial, points 17 to 35
32 to 53
Strength to Weight: Bending, points 18 to 29
26 to 37
Thermal Diffusivity, mm2/s 8.9 to 10
4.6
Thermal Shock Resistance, points 17 to 35
30 to 50

Alloy Composition

Carbon (C), % 3.0 to 3.5
0 to 0.070
Chromium (Cr), % 0
14 to 15.5
Copper (Cu), % 0
2.5 to 4.5
Iron (Fe), % 93.7 to 95.5
71.9 to 79.9
Manganese (Mn), % 0
0 to 1.0
Nickel (Ni), % 0
3.5 to 5.5
Niobium (Nb), % 0
0.15 to 0.45
Phosphorus (P), % 0 to 0.080
0 to 0.040
Silicon (Si), % 1.5 to 2.8
0 to 1.0
Sulfur (S), % 0
0 to 0.030

Comparable Variants