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SAE-AISI 1021 Steel vs. Ductile Cast Iron

Both SAE-AISI 1021 steel and ductile cast iron are iron alloys. They have a moderately high 95% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1021 steel and the bottom bar is ductile cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 130 to 150
160 to 310
Elastic (Young's, Tensile) Modulus, GPa 190
170 to 180
Elongation at Break, % 17 to 27
2.1 to 20
Poisson's Ratio 0.29
0.28 to 0.31
Shear Modulus, GPa 73
64 to 70
Shear Strength, MPa 310 to 320
420 to 800
Tensile Strength: Ultimate (UTS), MPa 480 to 530
460 to 920
Tensile Strength: Yield (Proof), MPa 260 to 450
310 to 670

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 400
290
Melting Completion (Liquidus), °C 1460
1160
Melting Onset (Solidus), °C 1420
1120
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 52
31 to 36
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.0
8.8 to 9.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
1.9
Density, g/cm3 7.9
7.1 to 7.5
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 18
21
Embodied Water, L/kg 46
43

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
17 to 80
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 530
280 to 1330
Stiffness to Weight: Axial, points 13
12 to 14
Stiffness to Weight: Bending, points 24
24 to 26
Strength to Weight: Axial, points 17 to 19
17 to 35
Strength to Weight: Bending, points 17 to 18
18 to 29
Thermal Diffusivity, mm2/s 14
8.9 to 10
Thermal Shock Resistance, points 15 to 17
17 to 35

Alloy Composition

Carbon (C), % 0.18 to 0.23
3.0 to 3.5
Iron (Fe), % 98.8 to 99.22
93.7 to 95.5
Manganese (Mn), % 0.6 to 0.9
0
Phosphorus (P), % 0 to 0.040
0 to 0.080
Silicon (Si), % 0
1.5 to 2.8
Sulfur (S), % 0 to 0.050
0

Comparable Variants