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AISI 420F Stainless Steel vs. AISI 409 Stainless Steel

Both AISI 420F stainless steel and AISI 409 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a very high 97% 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 420F stainless steel and the bottom bar is AISI 409 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 18
24
Fatigue Strength, MPa 270
140
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
75
Shear Strength, MPa 460
270
Tensile Strength: Ultimate (UTS), MPa 740
420
Tensile Strength: Yield (Proof), MPa 430
200

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Corrosion, °C 390
450
Maximum Temperature: Mechanical, °C 760
710
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1390
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
25
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.1
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.7
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
6.5
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 100
94

Common Calculations

PREN (Pitting Resistance) 14
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
83
Resilience: Unit (Modulus of Resilience), kJ/m3 480
100
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 27
15
Strength to Weight: Bending, points 23
16
Thermal Diffusivity, mm2/s 6.8
6.7
Thermal Shock Resistance, points 27
15

Alloy Composition

Carbon (C), % 0.3 to 0.4
0 to 0.080
Chromium (Cr), % 12 to 14
10.5 to 11.7
Iron (Fe), % 82.4 to 87.6
84.9 to 89.5
Manganese (Mn), % 0 to 1.3
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.060
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0.15 to 0.35
0 to 0.030
Titanium (Ti), % 0
0 to 0.75