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Automotive Malleable Cast Iron vs. ASTM A369 Grade FP91

Both automotive malleable cast iron and ASTM A369 grade FP91 are iron alloys. They have 90% of their average alloy composition in common. There are 28 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 automotive malleable cast iron and the bottom bar is ASTM A369 grade FP91.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 130 to 290
200
Elastic (Young's, Tensile) Modulus, GPa 180
190
Elongation at Break, % 1.0 to 10
19
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 70
75
Tensile Strength: Ultimate (UTS), MPa 350 to 720
670
Tensile Strength: Yield (Proof), MPa 220 to 590
460

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1410
1460
Melting Onset (Solidus), °C 1370
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 41
26
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
10

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
7.0
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.6
Embodied Energy, MJ/kg 20
37
Embodied Water, L/kg 45
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.8 to 30
110
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 950
560
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 13 to 26
24
Strength to Weight: Bending, points 14 to 24
22
Thermal Diffusivity, mm2/s 11
6.9
Thermal Shock Resistance, points 9.9 to 21
18

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 2.2 to 2.9
0.080 to 0.12
Chromium (Cr), % 0
8.0 to 9.5
Iron (Fe), % 93.6 to 96.7
87.3 to 90.3
Manganese (Mn), % 0.15 to 1.3
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0.020 to 0.15
0 to 0.025
Silicon (Si), % 0.9 to 1.9
0.2 to 0.5
Sulfur (S), % 0.020 to 0.2
0 to 0.025
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010