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AISI 303 Stainless Steel vs. AISI 309 Stainless Steel

Both AISI 303 stainless steel and AISI 309 stainless steel are iron alloys. They have a moderately high 90% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is AISI 303 stainless steel and the bottom bar is AISI 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 210
180 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40 to 51
34 to 47
Fatigue Strength, MPa 230 to 360
250 to 280
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
78
Shear Strength, MPa 430 to 470
420 to 470
Tensile Strength: Ultimate (UTS), MPa 600 to 690
600 to 710
Tensile Strength: Yield (Proof), MPa 230 to 420
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 410
440
Maximum Temperature: Mechanical, °C 930
980
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
16
Thermal Expansion, µm/m-K 17
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 15
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.0
3.6
Embodied Energy, MJ/kg 42
51
Embodied Water, L/kg 140
170

Common Calculations

PREN (Pitting Resistance) 18
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 440
170 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 25
21 to 25
Strength to Weight: Bending, points 20 to 22
20 to 23
Thermal Diffusivity, mm2/s 4.4
4.3
Thermal Shock Resistance, points 13 to 15
14 to 16

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.2
Chromium (Cr), % 17 to 19
22 to 24
Iron (Fe), % 67.3 to 74.9
58 to 66
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 8.0 to 10
12 to 15
Phosphorus (P), % 0 to 0.2
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0.15 to 0.35
0 to 0.030

Comparable Variants