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S21800 Stainless Steel vs. AISI 304L Stainless Steel

Both S21800 stainless steel and AISI 304L stainless steel are iron alloys. They have 89% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is AISI 304L stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
160 to 350
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
6.7 to 46
Fatigue Strength, MPa 330
170 to 430
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 88
79
Shear Modulus, GPa 75
77
Shear Strength, MPa 510
370 to 680
Tensile Strength: Ultimate (UTS), MPa 740
540 to 1160
Tensile Strength: Yield (Proof), MPa 390
190 to 870

Thermal Properties

Latent Heat of Fusion, J/g 340
290
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 900
540
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1310
1400
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
17

Otherwise Unclassified Properties

Base Metal Price, % relative 15
16
Density, g/cm3 7.5
7.8
Embodied Carbon, kg CO2/kg material 3.1
3.1
Embodied Energy, MJ/kg 45
44
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 19
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
71 to 240
Resilience: Unit (Modulus of Resilience), kJ/m3 390
92 to 1900
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
19 to 41
Strength to Weight: Bending, points 24
19 to 31
Thermal Shock Resistance, points 17
12 to 25

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.030
Chromium (Cr), % 16 to 18
18 to 20
Iron (Fe), % 59.1 to 65.4
65 to 74
Manganese (Mn), % 7.0 to 9.0
0 to 2.0
Nickel (Ni), % 8.0 to 9.0
8.0 to 12
Nitrogen (N), % 0.080 to 0.18
0 to 0.1
Phosphorus (P), % 0 to 0.060
0 to 0.045
Silicon (Si), % 3.5 to 4.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030