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AISI 309S Stainless Steel vs. AISI 403 Stainless Steel

Both AISI 309S stainless steel and AISI 403 stainless steel are iron alloys. They have 75% of their average alloy composition in common.

For each property being compared, the top bar is AISI 309S stainless steel and the bottom bar is AISI 403 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
190 to 240
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 42
16 to 25
Fatigue Strength, MPa 210
200 to 340
Poisson's Ratio 0.27
0.28
Reduction in Area, % 51
47 to 50
Rockwell B Hardness 84
83
Shear Modulus, GPa 78
76
Shear Strength, MPa 400
340 to 480
Tensile Strength: Ultimate (UTS), MPa 580
530 to 780
Tensile Strength: Yield (Proof), MPa 230
280 to 570

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Corrosion, °C 440
390
Maximum Temperature: Mechanical, °C 1080
740
Melting Completion (Liquidus), °C 1420
1450
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
28
Thermal Expansion, µm/m-K 16
9.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 19
6.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.6
1.9
Embodied Energy, MJ/kg 51
27
Embodied Water, L/kg 170
99

Common Calculations

PREN (Pitting Resistance) 23
12
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
110 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 140
210 to 840
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
19 to 28
Strength to Weight: Bending, points 20
19 to 24
Thermal Diffusivity, mm2/s 4.0
7.6
Thermal Shock Resistance, points 13
20 to 29

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.15
Chromium (Cr), % 22 to 24
11.5 to 13
Iron (Fe), % 58.1 to 66
84.7 to 88.5
Manganese (Mn), % 0 to 2.0
0 to 1.0
Nickel (Ni), % 12 to 15
0 to 0.6
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030