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ASTM A387 Grade 21 Steel vs. Austenitic Grey Cast Iron

Both ASTM A387 grade 21 steel and austenitic grey cast iron are iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 21 steel and the bottom bar is austenitic grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
110 to 210
Elastic (Young's, Tensile) Modulus, GPa 190
180
Poisson's Ratio 0.29
0.29 to 0.3
Shear Modulus, GPa 74
69 to 72
Tensile Strength: Ultimate (UTS), MPa 500 to 590
150 to 230

Thermal Properties

Latent Heat of Fusion, J/g 260
280 to 350
Melting Completion (Liquidus), °C 1470
1340 to 1400
Melting Onset (Solidus), °C 1430
1290 to 1350
Specific Heat Capacity, J/kg-K 470
470 to 490
Thermal Expansion, µm/m-K 13
13 to 14

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
14 to 24
Density, g/cm3 7.9
7.7 to 8.1
Embodied Carbon, kg CO2/kg material 1.8
3.1 to 4.7
Embodied Energy, MJ/kg 23
43 to 65
Embodied Water, L/kg 62
93 to 120

Common Calculations

PREN (Pitting Resistance) 6.4
2.0 to 5.0
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
23 to 25
Strength to Weight: Axial, points 18 to 21
5.3 to 8.2
Strength to Weight: Bending, points 18 to 20
7.9 to 11
Thermal Shock Resistance, points 14 to 17
4.5 to 6.5