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S21904 Stainless Steel vs. AISI 420 Stainless Steel

Both S21904 stainless steel and AISI 420 stainless steel are iron alloys. They have 78% 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 S21904 stainless steel and the bottom bar is AISI 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
190
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17 to 51
8.0 to 15
Fatigue Strength, MPa 380 to 550
220 to 670
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
76
Shear Strength, MPa 510 to 620
420 to 1010
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
690 to 1720
Tensile Strength: Yield (Proof), MPa 390 to 910
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 430
390
Maximum Temperature: Mechanical, °C 980
620
Melting Completion (Liquidus), °C 1400
1510
Melting Onset (Solidus), °C 1350
1450
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
27
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 15
7.5
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
88 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
380 to 4410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 36
25 to 62
Strength to Weight: Bending, points 23 to 29
22 to 41
Thermal Diffusivity, mm2/s 3.8
7.3
Thermal Shock Resistance, points 15 to 21
25 to 62

Alloy Composition

Carbon (C), % 0 to 0.040
0.15 to 0.4
Chromium (Cr), % 19 to 21.5
12 to 14
Iron (Fe), % 59.5 to 67.4
82.3 to 87.9
Manganese (Mn), % 8.0 to 10
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 5.5 to 7.5
0 to 0.75
Nitrogen (N), % 0.15 to 0.4
0
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

Comparable Variants