Grade of Duplex & Super Duplex Flanges

Duplex and super duplex stainless steels are a family of alloys that offer a combination of excellent corrosion resistance and high strength. They are widely used in industries such as oil and gas, chemical processing, and offshore applications. Here are some commonly used grades of duplex and super duplex stainless steel for flanges:

1. Duplex 2205: This is the most widely used grade of duplex stainless steel. It consists of approximately equal proportions of austenite and ferrite phases, providing a balanced combination of corrosion resistance and strength. UNS S31803 Flanges is suitable for a wide range of applications, including flanges in chemical processing, marine environments, and offshore oil and gas.
2. Duplex 2507: Also known as super duplex stainless steel, grade 2507 offers higher strength and enhanced resistance to corrosion compared to Duplex 2205. It has excellent resistance to chloride-induced pitting and crevice corrosion, making it ideal for demanding environments such as offshore and marine applications.
3. Zeron 100 (UNS S32760): This super duplex stainless steel grade offers exceptional corrosion resistance in a variety of aggressive environments, including sulfuric acid, seawater, and chloride-containing solutions. Zeron 100 is commonly used in flanges for offshore oil and gas production, chemical processing, and desalination plants.
4. SAF 2507 (UNS S32750): Another popular super duplex stainless steel grade, UNS S32750 Flanges provides excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. It is widely used in flanges for chemical processing, seawater handling, and oil and gas applications.
5. SAF 2207 (UNS S32205): This is a duplex stainless steel grade that offers good corrosion resistance and high strength. It is suitable for flanges in industries such as pulp and paper, chemical processing, and water treatment.

These are some of the commonly used grades of duplex and super duplex stainless steel for flanges. Each grade has its specific characteristics and is selected based on the application requirements, such as corrosion resistance, strength, and environment. It's important to consult with material experts or refer to specific industry standards for selecting the appropriate grade for a particular flange application.

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