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AISI 303 Stainless Steel vs. S21800 Stainless Steel

Both AISI 303 stainless steel and S21800 stainless steel are iron alloys. They have 89% 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 AISI 303 stainless steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 210
210
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40 to 51
40
Fatigue Strength, MPa 230 to 360
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
75
Shear Strength, MPa 430 to 470
510
Tensile Strength: Ultimate (UTS), MPa 600 to 690
740
Tensile Strength: Yield (Proof), MPa 230 to 420
390

Thermal Properties

Latent Heat of Fusion, J/g 290
340
Maximum Temperature: Corrosion, °C 410
410
Maximum Temperature: Mechanical, °C 930
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 17
16

Otherwise Unclassified Properties

Base Metal Price, % relative 15
15
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 3.0
3.1
Embodied Energy, MJ/kg 42
45
Embodied Water, L/kg 140
150

Common Calculations

PREN (Pitting Resistance) 18
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
250
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 440
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 22
24
Thermal Shock Resistance, points 13 to 15
17

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.1
Chromium (Cr), % 17 to 19
16 to 18
Iron (Fe), % 67.3 to 74.9
59.1 to 65.4
Manganese (Mn), % 0 to 2.0
7.0 to 9.0
Nickel (Ni), % 8.0 to 10
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.2
0 to 0.060
Silicon (Si), % 0 to 1.0
3.5 to 4.5
Sulfur (S), % 0.15 to 0.35
0 to 0.030