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AISI 420F Stainless Steel vs. S21904 Stainless Steel

Both AISI 420F stainless steel and S21904 stainless steel are iron alloys. They have 78% of their average alloy composition in common.

For each property being compared, the top bar is AISI 420F stainless steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 18
17 to 51
Fatigue Strength, MPa 270
380 to 550
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
78
Shear Strength, MPa 460
510 to 620
Tensile Strength: Ultimate (UTS), MPa 740
700 to 1000
Tensile Strength: Yield (Proof), MPa 430
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Corrosion, °C 390
430
Maximum Temperature: Mechanical, °C 760
980
Melting Completion (Liquidus), °C 1440
1400
Melting Onset (Solidus), °C 1390
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
14
Thermal Expansion, µm/m-K 10
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.1
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 3.7
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.0
3.0
Embodied Energy, MJ/kg 28
43
Embodied Water, L/kg 100
160

Common Calculations

PREN (Pitting Resistance) 14
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 480
380 to 2070
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 27
25 to 36
Strength to Weight: Bending, points 23
23 to 29
Thermal Diffusivity, mm2/s 6.8
3.8
Thermal Shock Resistance, points 27
15 to 21

Alloy Composition

Carbon (C), % 0.3 to 0.4
0 to 0.040
Chromium (Cr), % 12 to 14
19 to 21.5
Iron (Fe), % 82.4 to 87.6
59.5 to 67.4
Manganese (Mn), % 0 to 1.3
8.0 to 10
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
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