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S21904 Stainless Steel vs. AISI 420F Stainless Steel

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

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

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

Carbon (C), % 0 to 0.040
0.3 to 0.4
Chromium (Cr), % 19 to 21.5
12 to 14
Iron (Fe), % 59.5 to 67.4
82.4 to 87.6
Manganese (Mn), % 8.0 to 10
0 to 1.3
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 5.5 to 7.5
0
Nitrogen (N), % 0.15 to 0.4
0
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
0.15 to 0.35