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SAE-AISI 9255 Steel vs. AISI 409Cb Stainless Steel

Both SAE-AISI 9255 steel and AISI 409Cb stainless steel are iron alloys. Both are furnished in the annealed condition. They have 88% of their average alloy composition in common. There are 30 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 AISI 409Cb stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
24
Fatigue Strength, MPa 270
140
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
75
Shear Strength, MPa 430
270
Tensile Strength: Ultimate (UTS), MPa 680
420
Tensile Strength: Yield (Proof), MPa 390
200

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Mechanical, °C 400
710
Melting Completion (Liquidus), °C 1430
1450
Melting Onset (Solidus), °C 1390
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 46
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
8.5
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.2
Embodied Energy, MJ/kg 20
31
Embodied Water, L/kg 46
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
83
Resilience: Unit (Modulus of Resilience), kJ/m3 400
100
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
15
Strength to Weight: Bending, points 22
16
Thermal Diffusivity, mm2/s 13
6.7
Thermal Shock Resistance, points 21
15

Alloy Composition

Carbon (C), % 0.51 to 0.59
0 to 0.060
Chromium (Cr), % 0
10.5 to 11.7
Iron (Fe), % 96.2 to 97
84.9 to 89.5
Manganese (Mn), % 0.7 to 1.0
0 to 1.0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0 to 0.75
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 1.8 to 2.2
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.040