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S21900 Stainless Steel vs. S81921 Stainless Steel

Both S21900 stainless steel and S81921 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 90% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is S21900 stainless steel and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
260
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 50
29
Fatigue Strength, MPa 380
370
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
79
Shear Strength, MPa 510
460
Tensile Strength: Ultimate (UTS), MPa 710
710
Tensile Strength: Yield (Proof), MPa 390
500

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 420
430
Maximum Temperature: Mechanical, °C 980
990
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1350
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 15
14
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.0
2.9
Embodied Energy, MJ/kg 43
41
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 25
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
180
Resilience: Unit (Modulus of Resilience), kJ/m3 380
630
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26
25
Strength to Weight: Bending, points 23
23
Thermal Diffusivity, mm2/s 3.8
4.0
Thermal Shock Resistance, points 15
20

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 19 to 21.5
19 to 22
Iron (Fe), % 59.4 to 67.4
66.7 to 75.9
Manganese (Mn), % 8.0 to 10
2.0 to 4.0
Molybdenum (Mo), % 0
1.0 to 2.0
Nickel (Ni), % 5.5 to 7.5
2.0 to 4.0
Nitrogen (N), % 0.15 to 0.4
0.14 to 0.2
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