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S31727 Stainless Steel vs. S21904 Stainless Steel

Both S31727 stainless steel and S21904 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 S31727 stainless steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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