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ASTM A387 Grade 91 Class 2 vs. Grey Cast Iron

Both ASTM A387 grade 91 class 2 and grey cast iron are iron alloys. They have 90% 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 ASTM A387 grade 91 class 2 and the bottom bar is grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
160 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
180
Elongation at Break, % 20
9.6
Fatigue Strength, MPa 330
69 to 170
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
69
Shear Strength, MPa 420
180 to 610
Tensile Strength: Ultimate (UTS), MPa 670
160 to 450
Tensile Strength: Yield (Proof), MPa 470
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1460
1380
Melting Onset (Solidus), °C 1420
1180
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 26
46
Thermal Expansion, µm/m-K 13
11

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
1.9
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 2.6
1.5
Embodied Energy, MJ/kg 37
21
Embodied Water, L/kg 88
44

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 580
27 to 240
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
5.8 to 17
Strength to Weight: Bending, points 22
8.7 to 17
Thermal Diffusivity, mm2/s 6.9
13
Thermal Shock Resistance, points 19
6.0 to 17

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
3.1 to 3.4
Chromium (Cr), % 8.0 to 9.5
0
Iron (Fe), % 87.3 to 90.3
92.1 to 93.9
Manganese (Mn), % 0.3 to 0.6
0.5 to 0.7
Molybdenum (Mo), % 0.85 to 1.1
0
Nickel (Ni), % 0 to 0.4
0
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.020
0 to 0.9
Silicon (Si), % 0.2 to 0.5
2.5 to 2.8
Sulfur (S), % 0 to 0.010
0 to 0.15
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0