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SAE-AISI A8 Steel vs. SAE-AISI 9255 Steel

Both SAE-AISI A8 steel and SAE-AISI 9255 steel are iron alloys. They have a moderately high 92% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A8 steel and the bottom bar is SAE-AISI 9255 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
72
Tensile Strength: Ultimate (UTS), MPa 700 to 1920
680

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1480
1430
Melting Onset (Solidus), °C 1430
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 37
46
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
2.0
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 2.3
1.5
Embodied Energy, MJ/kg 31
20
Embodied Water, L/kg 73
46

Common Calculations

Stiffness to Weight: Axial, points 14
13
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
13
Thermal Shock Resistance, points 22 to 62
21

Alloy Composition

Carbon (C), % 0.5 to 0.6
0.51 to 0.59
Chromium (Cr), % 4.8 to 5.5
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 88.5 to 91.9
96.2 to 97
Manganese (Mn), % 0 to 0.5
0.7 to 1.0
Molybdenum (Mo), % 1.2 to 1.7
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.75 to 1.1
1.8 to 2.2
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 1.0 to 1.5
0