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S31727 Stainless Steel vs. S82121 Stainless Steel

Both S31727 stainless steel and S82121 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 81% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is S31727 stainless steel and the bottom bar is S82121 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
250
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
28
Fatigue Strength, MPa 240
370
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 78
78
Shear Strength, MPa 430
470
Tensile Strength: Ultimate (UTS), MPa 630
730
Tensile Strength: Yield (Proof), MPa 270
510

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 420
430
Maximum Temperature: Mechanical, °C 1010
1020
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 24
14
Density, g/cm3 8.0
7.7
Embodied Carbon, kg CO2/kg material 4.7
2.8
Embodied Energy, MJ/kg 64
40
Embodied Water, L/kg 180
150

Common Calculations

PREN (Pitting Resistance) 35
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
180
Resilience: Unit (Modulus of Resilience), kJ/m3 190
660
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22
26
Strength to Weight: Bending, points 20
23
Thermal Shock Resistance, points 14
20

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.035
Chromium (Cr), % 17.5 to 19
21 to 23
Copper (Cu), % 2.8 to 4.0
0.2 to 1.2
Iron (Fe), % 53.7 to 61.3
66.7 to 75.4
Manganese (Mn), % 0 to 1.0
1.0 to 2.5
Molybdenum (Mo), % 3.8 to 4.5
0.3 to 1.3
Nickel (Ni), % 14.5 to 16.5
2.0 to 4.0
Nitrogen (N), % 0.15 to 0.21
0.15 to 0.25
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.010