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SAE-AISI 9255 Steel vs. N08366 Stainless Steel

Both SAE-AISI 9255 steel and N08366 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 48% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 9255 steel and the bottom bar is N08366 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
180
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 21
34
Fatigue Strength, MPa 270
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
80
Shear Strength, MPa 430
390
Tensile Strength: Ultimate (UTS), MPa 680
590
Tensile Strength: Yield (Proof), MPa 390
240

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1390
1410
Specific Heat Capacity, J/kg-K 480
460
Thermal Conductivity, W/m-K 46
13
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
33
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 1.5
6.2
Embodied Energy, MJ/kg 20
84
Embodied Water, L/kg 46
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
160
Resilience: Unit (Modulus of Resilience), kJ/m3 400
150
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
20
Strength to Weight: Bending, points 22
19
Thermal Diffusivity, mm2/s 13
3.4
Thermal Shock Resistance, points 21
13

Alloy Composition

Carbon (C), % 0.51 to 0.59
0 to 0.035
Chromium (Cr), % 0
20 to 22
Iron (Fe), % 96.2 to 97
42.4 to 50.5
Manganese (Mn), % 0.7 to 1.0
0 to 2.0
Molybdenum (Mo), % 0
6.0 to 7.0
Nickel (Ni), % 0
23.5 to 25.5
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 1.8 to 2.2
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030