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S32550 Stainless Steel vs. SAE-AISI 9255 Steel

Both S32550 stainless steel and SAE-AISI 9255 steel are iron alloys. Both are furnished in the annealed condition. They have 63% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is S32550 stainless steel and the bottom bar is SAE-AISI 9255 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 21
21
Fatigue Strength, MPa 400
270
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
72
Shear Strength, MPa 540
430
Tensile Strength: Ultimate (UTS), MPa 860
680
Tensile Strength: Yield (Proof), MPa 620
390

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Mechanical, °C 1100
400
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1390
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 20
2.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.8
1.5
Embodied Energy, MJ/kg 53
20
Embodied Water, L/kg 180
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
120
Resilience: Unit (Modulus of Resilience), kJ/m3 940
400
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 31
24
Strength to Weight: Bending, points 26
22
Thermal Diffusivity, mm2/s 4.4
13
Thermal Shock Resistance, points 23
21

Alloy Composition

Carbon (C), % 0 to 0.040
0.51 to 0.59
Chromium (Cr), % 24 to 27
0
Copper (Cu), % 1.5 to 2.5
0
Iron (Fe), % 57.2 to 67
96.2 to 97
Manganese (Mn), % 0 to 1.5
0.7 to 1.0
Molybdenum (Mo), % 2.9 to 3.9
0
Nickel (Ni), % 4.5 to 6.5
0
Nitrogen (N), % 0.1 to 0.25
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
1.8 to 2.2
Sulfur (S), % 0 to 0.030
0 to 0.040