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S31277 Stainless Steel vs. S82121 Stainless Steel

Both S31277 stainless steel and S82121 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 69% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is S31277 stainless steel and the bottom bar is S82121 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 45
28
Fatigue Strength, MPa 380
370
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 80
78
Shear Strength, MPa 600
470
Tensile Strength: Ultimate (UTS), MPa 860
730
Tensile Strength: Yield (Proof), MPa 410
510

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 430
430
Maximum Temperature: Mechanical, °C 1100
1020
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1410
1380
Specific Heat Capacity, J/kg-K 460
480
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 36
14
Density, g/cm3 8.1
7.7
Embodied Carbon, kg CO2/kg material 6.7
2.8
Embodied Energy, MJ/kg 90
40
Embodied Water, L/kg 220
150

Common Calculations

PREN (Pitting Resistance) 51
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 320
180
Resilience: Unit (Modulus of Resilience), kJ/m3 410
660
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29
26
Strength to Weight: Bending, points 25
23
Thermal Shock Resistance, points 19
20

Alloy Composition

Carbon (C), % 0 to 0.020
0 to 0.035
Chromium (Cr), % 20.5 to 23
21 to 23
Copper (Cu), % 0.5 to 1.5
0.2 to 1.2
Iron (Fe), % 35.5 to 46.2
66.7 to 75.4
Manganese (Mn), % 0 to 3.0
1.0 to 2.5
Molybdenum (Mo), % 6.5 to 8.0
0.3 to 1.3
Nickel (Ni), % 26 to 28
2.0 to 4.0
Nitrogen (N), % 0.3 to 0.4
0.15 to 0.25
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.010