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S31100 Stainless Steel vs. SAE-AISI 9255 Steel

Both S31100 stainless steel and SAE-AISI 9255 steel are iron alloys. Both are furnished in the annealed condition. They have 67% 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 S31100 stainless steel and the bottom bar is SAE-AISI 9255 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 4.5
21
Fatigue Strength, MPa 330
270
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
72
Shear Strength, MPa 580
430
Tensile Strength: Ultimate (UTS), MPa 1000
680
Tensile Strength: Yield (Proof), MPa 710
390

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Mechanical, °C 1100
400
Melting Completion (Liquidus), °C 1420
1430
Melting Onset (Solidus), °C 1380
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 2.0
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 16
2.0
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.1
1.5
Embodied Energy, MJ/kg 44
20
Embodied Water, L/kg 170
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 40
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1240
400
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 36
24
Strength to Weight: Bending, points 29
22
Thermal Diffusivity, mm2/s 4.2
13
Thermal Shock Resistance, points 28
21

Alloy Composition

Carbon (C), % 0 to 0.060
0.51 to 0.59
Chromium (Cr), % 25 to 27
0
Iron (Fe), % 63.6 to 69
96.2 to 97
Manganese (Mn), % 0 to 1.0
0.7 to 1.0
Nickel (Ni), % 6.0 to 7.0
0
Phosphorus (P), % 0 to 0.045
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
Titanium (Ti), % 0 to 0.25
0