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ASTM Grade HI Steel vs. Grey Cast Iron

Both ASTM grade HI steel and grey cast iron are iron alloys. They have 55% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
160 to 300
Elastic (Young's, Tensile) Modulus, GPa 200
180
Elongation at Break, % 11
9.6
Fatigue Strength, MPa 150
69 to 170
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
69
Tensile Strength: Ultimate (UTS), MPa 550
160 to 450
Tensile Strength: Yield (Proof), MPa 270
98 to 290

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 490
490
Thermal Conductivity, W/m-K 15
46
Thermal Expansion, µm/m-K 17
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 23
1.9
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 4.1
1.5
Embodied Energy, MJ/kg 59
21
Embodied Water, L/kg 200
44

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 52
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 180
27 to 240
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 20
5.8 to 17
Strength to Weight: Bending, points 19
8.7 to 17
Thermal Diffusivity, mm2/s 3.9
13
Thermal Shock Resistance, points 12
6.0 to 17

Alloy Composition

Carbon (C), % 0.2 to 0.5
3.1 to 3.4
Chromium (Cr), % 26 to 30
0
Iron (Fe), % 46.9 to 59.8
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), % 14 to 18
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