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ASTM Grade HN Steel vs. Grey Cast Iron

Both ASTM grade HN steel and grey cast iron are iron alloys. They have 53% of their average alloy composition in common. There are 23 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 grade HN steel and the bottom bar is grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
160 to 300
Elastic (Young's, Tensile) Modulus, GPa 200
180
Elongation at Break, % 9.0
9.6
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
69
Tensile Strength: Ultimate (UTS), MPa 500
160 to 450

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Melting Completion (Liquidus), °C 1400
1380
Melting Onset (Solidus), °C 1350
1180
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 13
46
Thermal Expansion, µm/m-K 16
11

Otherwise Unclassified Properties

Base Metal Price, % relative 26
1.9
Density, g/cm3 7.9
7.5
Embodied Carbon, kg CO2/kg material 4.6
1.5
Embodied Energy, MJ/kg 66
21
Embodied Water, L/kg 180
44

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 17
5.8 to 17
Strength to Weight: Bending, points 18
8.7 to 17
Thermal Diffusivity, mm2/s 3.5
13
Thermal Shock Resistance, points 11
6.0 to 17

Alloy Composition

Carbon (C), % 0.2 to 0.5
3.1 to 3.4
Chromium (Cr), % 19 to 23
0
Iron (Fe), % 44.9 to 57.8
92.1 to 93.9
Manganese (Mn), % 0 to 2.0
0.5 to 0.7
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 23 to 27
0
Phosphorus (P), % 0 to 0.040
0 to 0.9
Silicon (Si), % 0 to 2.0
2.5 to 2.8
Sulfur (S), % 0 to 0.040
0 to 0.15