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AISI 409 Stainless Steel vs. AISI 431 Stainless Steel

Both AISI 409 stainless steel and AISI 431 stainless steel are iron alloys. They have a moderately high 93% of their average alloy composition in common. There are 32 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 409 stainless steel and the bottom bar is AISI 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 24
15 to 17
Fatigue Strength, MPa 140
430 to 610
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Shear Strength, MPa 270
550 to 840
Tensile Strength: Ultimate (UTS), MPa 420
890 to 1380
Tensile Strength: Yield (Proof), MPa 200
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Corrosion, °C 450
400
Maximum Temperature: Mechanical, °C 710
850
Melting Completion (Liquidus), °C 1450
1510
Melting Onset (Solidus), °C 1400
1450
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
26
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
9.0
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.0
2.2
Embodied Energy, MJ/kg 28
31
Embodied Water, L/kg 94
120

Common Calculations

PREN (Pitting Resistance) 11
16
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 100
1270 to 2770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 15
32 to 50
Strength to Weight: Bending, points 16
27 to 36
Thermal Diffusivity, mm2/s 6.7
7.0
Thermal Shock Resistance, points 15
28 to 43

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.2
Chromium (Cr), % 10.5 to 11.7
15 to 17
Iron (Fe), % 84.9 to 89.5
78.2 to 83.8
Manganese (Mn), % 0 to 1.0
0 to 1.0
Nickel (Ni), % 0 to 0.5
1.3 to 2.5
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0 to 0.75
0