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S21800 Stainless Steel vs. S82121 Stainless Steel

Both S21800 stainless steel and S82121 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 85% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is S82121 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
250
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
28
Fatigue Strength, MPa 330
370
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 75
78
Shear Strength, MPa 510
470
Tensile Strength: Ultimate (UTS), MPa 740
730
Tensile Strength: Yield (Proof), MPa 390
510

Thermal Properties

Latent Heat of Fusion, J/g 340
290
Maximum Temperature: Corrosion, °C 410
430
Maximum Temperature: Mechanical, °C 900
1020
Melting Completion (Liquidus), °C 1360
1430
Melting Onset (Solidus), °C 1310
1380
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 15
14
Density, g/cm3 7.5
7.7
Embodied Carbon, kg CO2/kg material 3.1
2.8
Embodied Energy, MJ/kg 45
40
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 19
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
180
Resilience: Unit (Modulus of Resilience), kJ/m3 390
660
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
26
Strength to Weight: Bending, points 24
23
Thermal Shock Resistance, points 17
20

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.035
Chromium (Cr), % 16 to 18
21 to 23
Copper (Cu), % 0
0.2 to 1.2
Iron (Fe), % 59.1 to 65.4
66.7 to 75.4
Manganese (Mn), % 7.0 to 9.0
1.0 to 2.5
Molybdenum (Mo), % 0
0.3 to 1.3
Nickel (Ni), % 8.0 to 9.0
2.0 to 4.0
Nitrogen (N), % 0.080 to 0.18
0.15 to 0.25
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 0.010