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ASTM A387 Grade 91 Class 2 vs. Automotive Grey Cast Iron

Both ASTM A387 grade 91 class 2 and automotive grey cast iron are iron alloys. 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 ASTM A387 grade 91 class 2 and the bottom bar is automotive grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
160 to 280
Elastic (Young's, Tensile) Modulus, GPa 190
180
Elongation at Break, % 20
9.6 to 14
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
69 to 70
Tensile Strength: Ultimate (UTS), MPa 670
140 to 290
Tensile Strength: Yield (Proof), MPa 470
94 to 200

Thermal Properties

Latent Heat of Fusion, J/g 270
260 to 280
Melting Completion (Liquidus), °C 1460
1380 to 1390
Melting Onset (Solidus), °C 1420
1340 to 1350
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 26
41 to 43
Thermal Expansion, µm/m-K 13
12 to 14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
7.4 to 7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 10
8.8 to 9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
1.9 to 3.0
Density, g/cm3 7.8
7.5 to 7.6
Embodied Carbon, kg CO2/kg material 2.6
1.5 to 1.7
Embodied Energy, MJ/kg 37
21 to 24
Embodied Water, L/kg 88
44 to 51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
18 to 25
Resilience: Unit (Modulus of Resilience), kJ/m3 580
25 to 110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
5.2 to 11
Strength to Weight: Bending, points 22
8.0 to 13
Thermal Diffusivity, mm2/s 6.9
11 to 12
Thermal Shock Resistance, points 19
4.2 to 8.6