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SAE-AISI A8 Steel vs. ASTM Grade HE Steel

Both SAE-AISI A8 steel and ASTM grade HE steel are iron alloys. They have 67% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A8 steel and the bottom bar is ASTM grade HE steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 74
79
Tensile Strength: Ultimate (UTS), MPa 700 to 1920
670

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Melting Completion (Liquidus), °C 1480
1400
Melting Onset (Solidus), °C 1430
1360
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 37
14
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
19
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 2.3
3.5
Embodied Energy, MJ/kg 31
50
Embodied Water, L/kg 73
190

Common Calculations

PREN (Pitting Resistance) 12
29
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 68
24
Strength to Weight: Bending, points 22 to 44
22
Thermal Diffusivity, mm2/s 9.9
3.6
Thermal Shock Resistance, points 22 to 62
14

Alloy Composition

Carbon (C), % 0.5 to 0.6
0.2 to 0.5
Chromium (Cr), % 4.8 to 5.5
26 to 30
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 88.5 to 91.9
53.9 to 65.8
Manganese (Mn), % 0 to 0.5
0 to 2.0
Molybdenum (Mo), % 1.2 to 1.7
0 to 0.5
Nickel (Ni), % 0 to 0.3
8.0 to 11
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.75 to 1.1
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 1.0 to 1.5
0