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AISI 309 Stainless Steel vs. S21800 Stainless Steel

Both AISI 309 stainless steel and S21800 stainless steel are iron alloys. They have 89% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is AISI 309 stainless steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 210
210
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34 to 47
40
Fatigue Strength, MPa 250 to 280
330
Poisson's Ratio 0.27
0.28
Rockwell B Hardness 84
88
Shear Modulus, GPa 78
75
Shear Strength, MPa 420 to 470
510
Tensile Strength: Ultimate (UTS), MPa 600 to 710
740
Tensile Strength: Yield (Proof), MPa 260 to 350
390

Thermal Properties

Latent Heat of Fusion, J/g 290
340
Maximum Temperature: Corrosion, °C 440
410
Maximum Temperature: Mechanical, °C 980
900
Melting Completion (Liquidus), °C 1450
1360
Melting Onset (Solidus), °C 1400
1310
Specific Heat Capacity, J/kg-K 480
500
Thermal Expansion, µm/m-K 15
16

Otherwise Unclassified Properties

Base Metal Price, % relative 19
15
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 3.6
3.1
Embodied Energy, MJ/kg 51
45
Embodied Water, L/kg 170
150

Common Calculations

PREN (Pitting Resistance) 23
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
250
Resilience: Unit (Modulus of Resilience), kJ/m3 170 to 310
390
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 21 to 25
27
Strength to Weight: Bending, points 20 to 23
24
Thermal Shock Resistance, points 14 to 16
17

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.1
Chromium (Cr), % 22 to 24
16 to 18
Iron (Fe), % 58 to 66
59.1 to 65.4
Manganese (Mn), % 0 to 2.0
7.0 to 9.0
Nickel (Ni), % 12 to 15
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.045
0 to 0.060
Silicon (Si), % 0 to 0.75
3.5 to 4.5
Sulfur (S), % 0 to 0.030
0 to 0.030