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S21800 Stainless Steel vs. AISI 420 Stainless Steel

Both S21800 stainless steel and AISI 420 stainless steel are iron alloys. They have 77% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is AISI 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
190
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 40
8.0 to 15
Fatigue Strength, MPa 330
220 to 670
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 88
84
Shear Modulus, GPa 75
76
Shear Strength, MPa 510
420 to 1010
Tensile Strength: Ultimate (UTS), MPa 740
690 to 1720
Tensile Strength: Yield (Proof), MPa 390
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 340
280
Maximum Temperature: Corrosion, °C 410
390
Maximum Temperature: Mechanical, °C 900
620
Melting Completion (Liquidus), °C 1360
1510
Melting Onset (Solidus), °C 1310
1450
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
10

Otherwise Unclassified Properties

Base Metal Price, % relative 15
7.5
Density, g/cm3 7.5
7.7
Embodied Carbon, kg CO2/kg material 3.1
2.0
Embodied Energy, MJ/kg 45
28
Embodied Water, L/kg 150
100

Common Calculations

PREN (Pitting Resistance) 19
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
88 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 390
380 to 4410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
25 to 62
Strength to Weight: Bending, points 24
22 to 41
Thermal Shock Resistance, points 17
25 to 62

Alloy Composition

Carbon (C), % 0 to 0.1
0.15 to 0.4
Chromium (Cr), % 16 to 18
12 to 14
Iron (Fe), % 59.1 to 65.4
82.3 to 87.9
Manganese (Mn), % 7.0 to 9.0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 8.0 to 9.0
0 to 0.75
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.040
Silicon (Si), % 3.5 to 4.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030