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S31727 Stainless Steel vs. S81921 Stainless Steel

Both S31727 stainless steel and S81921 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 S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
260
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
29
Fatigue Strength, MPa 240
370
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
79
Shear Strength, MPa 430
460
Tensile Strength: Ultimate (UTS), MPa 630
710
Tensile Strength: Yield (Proof), MPa 270
500

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 420
430
Maximum Temperature: Mechanical, °C 1010
990
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1390
1390
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
2.9
Embodied Energy, MJ/kg 64
41
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
630
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22
25
Strength to Weight: Bending, points 20
23
Thermal Shock Resistance, points 14
20

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 17.5 to 19
19 to 22
Copper (Cu), % 2.8 to 4.0
0
Iron (Fe), % 53.7 to 61.3
66.7 to 75.9
Manganese (Mn), % 0 to 1.0
2.0 to 4.0
Molybdenum (Mo), % 3.8 to 4.5
1.0 to 2.0
Nickel (Ni), % 14.5 to 16.5
2.0 to 4.0
Nitrogen (N), % 0.15 to 0.21
0.14 to 0.2
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 0.030