304 VS 316L VS 2205 Duplex Stainless Steel Spigots and Hardware

304/304L Stainless Steel

The material composition of 304 stainless steel is most suitable in applications where it is not introduced to any harsh or severe treatments. The Chromium-nickel alloy of 304 stainless steel makes it somewhat durable and resistant to corrosion and oxidation, though much lower in comparison to 316 Marine Grade also when compared to 2205 Duplex. It would not be recommended to use 304 or 304L Spigots/Hardware for your frameless glass pool fence as exposure to salt water or chlorinated environments would cause corrosion and oxidation.


Composition Specification (%) 304/304L

composition specificaition 304:304L

Mechanical Properties of 304/304L

Mechanical properties of 304:304L Spigots


316/316L (Marine Grade) Stainless Steel

When exposed to chloride and other chemical based environments such as salt water, 316 stainless steel shows a high resistance to corrosion, oxidation and heating as compared to 304 stainless steel. Furthermore, in comparison to 304 stainless steel, it is more durable, easier to fabricate, requires lower maintenance as it is easier to clean. 316 also hold the advantages of being easier to finish and weld.

Composition Specification (%) 316/316L

Composition Specs Of 316:316L spigots

Mechanical Properties of 316/316L

Mechanical properties of 316:316L

2205 Duplex Stainless Steel

2205 Duplex stainless steel combines most of the advantageous properties of ferritic and austenitic steels making it one of the highest grades of stainless steel. Due to the duplex nature of the stainless steel alloy, its Pitting and Crevice Corrosion Resistance provides a high resistance to corrosion in most chloride-based environments, giving it a high durability against chloride stress corrosion cracking. Apart from its lowest alloy, all Duplex 2205 stainless steels have much higher tensile strength and yield strength than both 304 and 316 Marine Grade stainless steel combined.

There are two compositions of Duplex 2205.The original composition, S31803, has been advanced by numerous steel suppliers over the years, and this composition range is recognised as S32205. The S32205 composition provides greater corrosion resistance when compared to S31803.

Composition Specification (%) 2205 (S31803)/ 2205 (S32205)

Composition Specification 2205 Spigot

Mechanical Properties of 2205 (S31803)/ 2205 (S32205)

Mechanical properties of 2205 Spigots

Comparison of Pitting and Corrosion of 304L VS 316L VS 2205 Duplex Stainless Steel

Because of its high endurance to corrosion and its resistance, 2205 Duplex stainless steel is better suited for chloride-based surroundings such as swimming pool fencing. CPT (Critical Pitting Temperature) and CCT (Critical Corrosion Temperatures) tests performed on Duplex 2205, 316 Marine Grade and 304 shows that Duplex 2205 has a much greater resistance to corrosion in comparison to the other quality stainless steels. This quality makes Duplex 2205 Stainless Steel highly versatile in conditions where hardware is exposed to saltwater or chlorinated swimming pools.

Critical Corrosion Temperature (CCT) VS Critical Pitting Temperature (CPT)

Critical Corrosion Temperatute (CCT) VS Critical Pitting Temperature (CPT)

At Avant-Garde Glass, we only use the best quality materials for our glass fences. All our pool fencing spigots are manufactured from Duplex 2205 Stainless Steel (S32205) and the material composition of our glass spigots can be seen here. All other hardware is manufactured with 316L Stainless Steel.

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