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AISI 420F Stainless Steel vs. S81921 Stainless Steel

Both AISI 420F stainless steel and S81921 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 86% of their average alloy composition in common. There are 33 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 S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 18
29
Fatigue Strength, MPa 270
370
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
79
Shear Strength, MPa 460
460
Tensile Strength: Ultimate (UTS), MPa 740
710
Tensile Strength: Yield (Proof), MPa 430
500

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Corrosion, °C 390
430
Maximum Temperature: Mechanical, °C 760
990
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1390
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
15
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.1
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.7
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
14
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.0
2.9
Embodied Energy, MJ/kg 28
41
Embodied Water, L/kg 100
150

Common Calculations

PREN (Pitting Resistance) 14
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
180
Resilience: Unit (Modulus of Resilience), kJ/m3 480
630
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 27
25
Strength to Weight: Bending, points 23
23
Thermal Diffusivity, mm2/s 6.8
4.0
Thermal Shock Resistance, points 27
20

Alloy Composition

Carbon (C), % 0.3 to 0.4
0 to 0.030
Chromium (Cr), % 12 to 14
19 to 22
Iron (Fe), % 82.4 to 87.6
66.7 to 75.9
Manganese (Mn), % 0 to 1.3
2.0 to 4.0
Molybdenum (Mo), % 0 to 0.5
1.0 to 2.0
Nickel (Ni), % 0
2.0 to 4.0
Nitrogen (N), % 0
0.14 to 0.2
Phosphorus (P), % 0 to 0.060
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0.15 to 0.35
0 to 0.030