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ASTM Grade HI Steel vs. Austempered Cast Iron

Both ASTM grade HI steel and austempered cast iron are iron alloys. They have 56% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
270 to 490
Elastic (Young's, Tensile) Modulus, GPa 200
180
Elongation at Break, % 11
1.1 to 13
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
62 to 69
Tensile Strength: Ultimate (UTS), MPa 550
860 to 1800
Tensile Strength: Yield (Proof), MPa 270
560 to 1460

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Melting Completion (Liquidus), °C 1400
1380
Melting Onset (Solidus), °C 1350
1340
Specific Heat Capacity, J/kg-K 490
490
Thermal Conductivity, W/m-K 15
42
Thermal Expansion, µm/m-K 17
13

Otherwise Unclassified Properties

Base Metal Price, % relative 23
2.9
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 4.1
1.8
Embodied Energy, MJ/kg 59
25
Embodied Water, L/kg 200
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 52
19 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 180
880 to 3970
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 20
32 to 66
Strength to Weight: Bending, points 19
27 to 44
Thermal Diffusivity, mm2/s 3.9
11
Thermal Shock Resistance, points 12
25 to 53

Alloy Composition

Aluminum (Al), % 0
0 to 0.050
Arsenic (As), % 0
0 to 0.020
Carbon (C), % 0.2 to 0.5
3.4 to 3.8
Chromium (Cr), % 26 to 30
0 to 0.1
Copper (Cu), % 0
0 to 0.8
Iron (Fe), % 46.9 to 59.8
89.6 to 94
Magnesium (Mg), % 0
0 to 0.040
Manganese (Mn), % 0 to 2.0
0.3 to 0.4
Molybdenum (Mo), % 0 to 0.5
0 to 0.3
Nickel (Ni), % 14 to 18
0 to 2.0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Selenium (Se), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
2.3 to 2.7
Sulfur (S), % 0 to 0.040
0 to 0.020
Tin (Sn), % 0
0 to 0.020
Vanadium (V), % 0
0 to 0.1