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ASTM Grade HI Steel vs. ASTM A356 Grade 8

Both ASTM grade HI steel and ASTM A356 grade 8 are iron alloys. They have 56% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HI steel and the bottom bar is ASTM A356 grade 8.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
190
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11
21
Fatigue Strength, MPa 150
270
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
73
Tensile Strength: Ultimate (UTS), MPa 550
630
Tensile Strength: Yield (Proof), MPa 270
390

Thermal Properties

Latent Heat of Fusion, J/g 310
260
Maximum Temperature: Mechanical, °C 1100
440
Melting Completion (Liquidus), °C 1400
1470
Melting Onset (Solidus), °C 1350
1430
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 15
38
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 23
3.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.1
2.0
Embodied Energy, MJ/kg 59
26
Embodied Water, L/kg 200
55

Common Calculations

PREN (Pitting Resistance) 29
4.7
Resilience: Ultimate (Unit Rupture Work), MJ/m3 52
110
Resilience: Unit (Modulus of Resilience), kJ/m3 180
390
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 20
22
Strength to Weight: Bending, points 19
21
Thermal Diffusivity, mm2/s 3.9
10
Thermal Shock Resistance, points 12
18

Alloy Composition

Carbon (C), % 0.2 to 0.5
0 to 0.2
Chromium (Cr), % 26 to 30
1.0 to 1.5
Iron (Fe), % 46.9 to 59.8
95.4 to 97.4
Manganese (Mn), % 0 to 2.0
0.5 to 0.9
Molybdenum (Mo), % 0 to 0.5
0.9 to 1.2
Nickel (Ni), % 14 to 18
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 2.0
0.2 to 0.6
Sulfur (S), % 0 to 0.040
0 to 0.030
Vanadium (V), % 0
0.050 to 0.15