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S39277 Stainless Steel vs. S21900 Stainless Steel

Both S39277 stainless steel and S21900 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 88% of their average alloy composition in common.

For each property being compared, the top bar is S39277 stainless steel and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
220
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 28
50
Fatigue Strength, MPa 480
380
Poisson's Ratio 0.27
0.28
Reduction in Area, % 57
57
Shear Modulus, GPa 80
78
Shear Strength, MPa 600
510
Tensile Strength: Ultimate (UTS), MPa 930
710
Tensile Strength: Yield (Proof), MPa 660
390

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 450
420
Maximum Temperature: Mechanical, °C 1100
980
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1410
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 16
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 23
15
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 4.2
3.0
Embodied Energy, MJ/kg 59
43
Embodied Water, L/kg 180
160

Common Calculations

PREN (Pitting Resistance) 43
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
300
Resilience: Unit (Modulus of Resilience), kJ/m3 1070
380
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 33
26
Strength to Weight: Bending, points 27
23
Thermal Diffusivity, mm2/s 4.2
3.8
Thermal Shock Resistance, points 26
15

Alloy Composition

Carbon (C), % 0 to 0.025
0 to 0.080
Chromium (Cr), % 24 to 26
19 to 21.5
Copper (Cu), % 1.2 to 2.0
0
Iron (Fe), % 56.8 to 64.3
59.4 to 67.4
Manganese (Mn), % 0 to 0.8
8.0 to 10
Molybdenum (Mo), % 3.0 to 4.0
0
Nickel (Ni), % 6.5 to 8.0
5.5 to 7.5
Nitrogen (N), % 0.23 to 0.33
0.15 to 0.4
Phosphorus (P), % 0 to 0.025
0 to 0.045
Silicon (Si), % 0 to 0.8
0 to 1.0
Sulfur (S), % 0 to 0.0020
0 to 0.030
Tungsten (W), % 0.8 to 1.2
0