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S81921 Stainless Steel vs. S21900 Stainless Steel

Both S81921 stainless steel and S21900 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 S81921 stainless steel and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.080
Chromium (Cr), % 19 to 22
19 to 21.5
Iron (Fe), % 66.7 to 75.9
59.4 to 67.4
Manganese (Mn), % 2.0 to 4.0
8.0 to 10
Molybdenum (Mo), % 1.0 to 2.0
0
Nickel (Ni), % 2.0 to 4.0
5.5 to 7.5
Nitrogen (N), % 0.14 to 0.2
0.15 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030