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S21904 Stainless Steel vs. S31727 Stainless Steel

Both S21904 stainless steel and S31727 stainless steel are iron alloys. They have 83% of their average alloy composition in common. There are 29 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 S21904 stainless steel and the bottom bar is S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17 to 51
40
Fatigue Strength, MPa 380 to 550
240
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
78
Shear Strength, MPa 510 to 620
430
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
630
Tensile Strength: Yield (Proof), MPa 390 to 910
270

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 430
420
Maximum Temperature: Mechanical, °C 980
1010
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1350
1390
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 17
16

Otherwise Unclassified Properties

Base Metal Price, % relative 15
24
Density, g/cm3 7.7
8.0
Embodied Carbon, kg CO2/kg material 3.0
4.7
Embodied Energy, MJ/kg 43
64
Embodied Water, L/kg 160
180

Common Calculations

PREN (Pitting Resistance) 25
35
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
200
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
190
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25 to 36
22
Strength to Weight: Bending, points 23 to 29
20
Thermal Shock Resistance, points 15 to 21
14

Alloy Composition

Carbon (C), % 0 to 0.040
0 to 0.030
Chromium (Cr), % 19 to 21.5
17.5 to 19
Copper (Cu), % 0
2.8 to 4.0
Iron (Fe), % 59.5 to 67.4
53.7 to 61.3
Manganese (Mn), % 8.0 to 10
0 to 1.0
Molybdenum (Mo), % 0
3.8 to 4.5
Nickel (Ni), % 5.5 to 7.5
14.5 to 16.5
Nitrogen (N), % 0.15 to 0.4
0.15 to 0.21
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030