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SAE-AISI 9255 Steel vs. S32101 Stainless Steel

Both SAE-AISI 9255 steel and S32101 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 72% 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 S32101 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
34
Fatigue Strength, MPa 270
400
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Shear Strength, MPa 430
490
Tensile Strength: Ultimate (UTS), MPa 680
740
Tensile Strength: Yield (Proof), MPa 390
500

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Mechanical, °C 400
1000
Melting Completion (Liquidus), °C 1430
1420
Melting Onset (Solidus), °C 1390
1370
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 46
15
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
12
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.6
Embodied Energy, MJ/kg 20
38
Embodied Water, L/kg 46
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
230
Resilience: Unit (Modulus of Resilience), kJ/m3 400
640
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
27
Strength to Weight: Bending, points 22
24
Thermal Diffusivity, mm2/s 13
4.0
Thermal Shock Resistance, points 21
20

Alloy Composition

Carbon (C), % 0.51 to 0.59
0 to 0.040
Chromium (Cr), % 0
21 to 22
Copper (Cu), % 0
0.1 to 0.8
Iron (Fe), % 96.2 to 97
67.3 to 73.3
Manganese (Mn), % 0.7 to 1.0
4.0 to 6.0
Molybdenum (Mo), % 0
0.1 to 0.8
Nickel (Ni), % 0
1.4 to 1.7
Nitrogen (N), % 0
0.2 to 0.25
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