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SAE-AISI 9254 Steel vs. AISI 309S Stainless Steel

Both SAE-AISI 9254 steel and AISI 309S stainless steel are iron alloys. Both are furnished in the annealed condition. They have 64% 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 SAE-AISI 9254 steel and the bottom bar is AISI 309S stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20
42
Fatigue Strength, MPa 280
210
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 72
78
Shear Strength, MPa 410
400
Tensile Strength: Ultimate (UTS), MPa 660
580
Tensile Strength: Yield (Proof), MPa 410
230

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Mechanical, °C 410
1080
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1400
1370
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 46
15
Thermal Expansion, µm/m-K 13
16

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 2.2
19
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.5
3.6
Embodied Energy, MJ/kg 20
51
Embodied Water, L/kg 49
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
190
Resilience: Unit (Modulus of Resilience), kJ/m3 450
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
21
Strength to Weight: Bending, points 22
20
Thermal Diffusivity, mm2/s 12
4.0
Thermal Shock Resistance, points 20
13

Alloy Composition

Carbon (C), % 0.51 to 0.59
0 to 0.080
Chromium (Cr), % 0.6 to 0.8
22 to 24
Iron (Fe), % 96.1 to 97.1
58.1 to 66
Manganese (Mn), % 0.6 to 0.8
0 to 2.0
Nickel (Ni), % 0
12 to 15
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 1.2 to 1.6
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030