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AISI 308L Stainless Steel vs. AISI 309S Stainless Steel

Both AISI 308L stainless steel and AISI 309S stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 94% of their average alloy composition in common. There are 34 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is AISI 308L stainless steel and the bottom bar is AISI 309S stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
42
Fatigue Strength, MPa 180
210
Poisson's Ratio 0.28
0.27
Reduction in Area, % 46
51
Shear Modulus, GPa 78
78
Shear Strength, MPa 380
400
Tensile Strength: Ultimate (UTS), MPa 580
580
Tensile Strength: Yield (Proof), MPa 230
230

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 430
440
Maximum Temperature: Mechanical, °C 1010
1080
Melting Completion (Liquidus), °C 1420
1420
Melting Onset (Solidus), °C 1380
1370
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 16
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.2
3.6
Embodied Energy, MJ/kg 45
51
Embodied Water, L/kg 160
170

Common Calculations

PREN (Pitting Resistance) 21
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
190
Resilience: Unit (Modulus of Resilience), kJ/m3 140
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
21
Strength to Weight: Bending, points 20
20
Thermal Diffusivity, mm2/s 4.1
4.0
Thermal Shock Resistance, points 13
13

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.080
Chromium (Cr), % 19.5 to 22
22 to 24
Iron (Fe), % 63.8 to 70.5
58.1 to 66
Manganese (Mn), % 1.0 to 2.5
0 to 2.0
Nickel (Ni), % 9.0 to 11
12 to 15
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.25 to 0.6
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030