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S21900 Stainless Steel vs. S31266 Stainless Steel

Both S21900 stainless steel and S31266 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 71% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is S21900 stainless steel and the bottom bar is S31266 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 50
40
Fatigue Strength, MPa 380
400
Poisson's Ratio 0.28
0.28
Reduction in Area, % 57
56
Shear Modulus, GPa 78
81
Shear Strength, MPa 510
590
Tensile Strength: Ultimate (UTS), MPa 710
860
Tensile Strength: Yield (Proof), MPa 390
470

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Maximum Temperature: Corrosion, °C 420
440
Maximum Temperature: Mechanical, °C 980
1100
Melting Completion (Liquidus), °C 1400
1470
Melting Onset (Solidus), °C 1350
1420
Specific Heat Capacity, J/kg-K 480
460
Thermal Conductivity, W/m-K 14
12
Thermal Expansion, µm/m-K 17
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 15
37
Density, g/cm3 7.7
8.2
Embodied Carbon, kg CO2/kg material 3.0
6.5
Embodied Energy, MJ/kg 43
89
Embodied Water, L/kg 160
220

Common Calculations

PREN (Pitting Resistance) 25
54
Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
290
Resilience: Unit (Modulus of Resilience), kJ/m3 380
540
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 26
29
Strength to Weight: Bending, points 23
24
Thermal Diffusivity, mm2/s 3.8
3.1
Thermal Shock Resistance, points 15
18

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 19 to 21.5
23 to 25
Copper (Cu), % 0
1.0 to 2.5
Iron (Fe), % 59.4 to 67.4
34.1 to 46
Manganese (Mn), % 8.0 to 10
2.0 to 4.0
Molybdenum (Mo), % 0
5.2 to 6.2
Nickel (Ni), % 5.5 to 7.5
21 to 24
Nitrogen (N), % 0.15 to 0.4
0.35 to 0.6
Phosphorus (P), % 0 to 0.045
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 0
1.5 to 2.5