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ASTM Grade HC Steel vs. SAE-AISI A8 Steel

Both ASTM grade HC steel and SAE-AISI A8 steel are iron alloys. They have 75% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
74
Tensile Strength: Ultimate (UTS), MPa 430
700 to 1920

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Melting Completion (Liquidus), °C 1410
1480
Melting Onset (Solidus), °C 1370
1430
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 17
37
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
9.5

Otherwise Unclassified Properties

Base Metal Price, % relative 14
8.5
Density, g/cm3 7.6
7.9
Embodied Carbon, kg CO2/kg material 2.8
2.3
Embodied Energy, MJ/kg 40
31
Embodied Water, L/kg 170
73

Common Calculations

PREN (Pitting Resistance) 29
12
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 16
25 to 68
Strength to Weight: Bending, points 16
22 to 44
Thermal Diffusivity, mm2/s 4.5
9.9
Thermal Shock Resistance, points 14
22 to 62

Alloy Composition

Carbon (C), % 0 to 0.5
0.5 to 0.6
Chromium (Cr), % 26 to 30
4.8 to 5.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 61.9 to 74
88.5 to 91.9
Manganese (Mn), % 0 to 1.0
0 to 0.5
Molybdenum (Mo), % 0 to 0.5
1.2 to 1.7
Nickel (Ni), % 0 to 4.0
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 2.0
0.75 to 1.1
Sulfur (S), % 0 to 0.040
0 to 0.030
Tungsten (W), % 0
1.0 to 1.5