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AISI 409 Stainless Steel vs. AISI 420 Stainless Steel

Both AISI 409 stainless steel and AISI 420 stainless steel are iron alloys. They have a very high 98% 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 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 24
8.0 to 15
Fatigue Strength, MPa 140
220 to 670
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
76
Shear Strength, MPa 270
420 to 1010
Tensile Strength: Ultimate (UTS), MPa 420
690 to 1720
Tensile Strength: Yield (Proof), MPa 200
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Corrosion, °C 450
390
Maximum Temperature: Mechanical, °C 710
620
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
27
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
7.5
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.0
2.0
Embodied Energy, MJ/kg 28
28
Embodied Water, L/kg 94
100

Common Calculations

PREN (Pitting Resistance) 11
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
88 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 100
380 to 4410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 15
25 to 62
Strength to Weight: Bending, points 16
22 to 41
Thermal Diffusivity, mm2/s 6.7
7.3
Thermal Shock Resistance, points 15
25 to 62

Alloy Composition

Carbon (C), % 0 to 0.080
0.15 to 0.4
Chromium (Cr), % 10.5 to 11.7
12 to 14
Iron (Fe), % 84.9 to 89.5
82.3 to 87.9
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.5
0 to 0.75
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