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AISI 409 Stainless Steel vs. S21640 Stainless Steel

Both AISI 409 stainless steel and S21640 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 81% of their average alloy composition in common. There are 32 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 409 stainless steel and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 24
46
Fatigue Strength, MPa 140
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
78
Shear Strength, MPa 270
520
Tensile Strength: Ultimate (UTS), MPa 420
740
Tensile Strength: Yield (Proof), MPa 200
350

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Corrosion, °C 450
490
Maximum Temperature: Mechanical, °C 710
940
Melting Completion (Liquidus), °C 1450
1430
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
15
Thermal Expansion, µm/m-K 11
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
17
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.0
3.6
Embodied Energy, MJ/kg 28
51
Embodied Water, L/kg 94
150

Common Calculations

PREN (Pitting Resistance) 11
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
280
Resilience: Unit (Modulus of Resilience), kJ/m3 100
300
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 15
27
Strength to Weight: Bending, points 16
23
Thermal Diffusivity, mm2/s 6.7
4.0
Thermal Shock Resistance, points 15
16

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.080
Chromium (Cr), % 10.5 to 11.7
17.5 to 19.5
Iron (Fe), % 84.9 to 89.5
63 to 74.3
Manganese (Mn), % 0 to 1.0
3.5 to 6.5
Molybdenum (Mo), % 0
0.5 to 2.0
Nickel (Ni), % 0 to 0.5
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0
0.080 to 0.3
Phosphorus (P), % 0 to 0.045
0 to 0.060
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