General Properties

Duplex 2205 is a two-phase, ferritic, austenitic 22% chromium, 3% molybdenum, 5 to 6% nickel alloyed stainless steel. It is the most widely used duplex stainless steel grade and is characterized by high yield strength, double that of the standard austenitic stainless steel grades. It also demonstrates good fatigue strength, as well as outstanding resistance to stress corrosion cracking, crevice, pitting, erosion, and general corrosion in severe environments.

Applications:

• Chemical processing, transport and storage – pressure vessels, tanks, piping, and heat exchangers
• Oil and gas exploration and processing equipment – piping, tubing, and heat exchangers
• Marine and other high chloride environments
• Effluent scrubbing systems
• Pulp and paper industry – digesters, bleaching equipment, and stock-handling systems
• Cargo tanks for ships and trucks
• Food processing equipment
• Biofuels plants

Standards:

• ASTM/ASME: A240 UNS S32205/S31803
• EURONORM: 1.4462 X2CrNiMoN 22.5.3
• AFNOR: Z3 CrNi 22.05 AZ
• DIN: W.Nr 1.4462

Corrosion Resistance:

• Due to its high chromium, molybdenum, and nitrogen content, Duplex 2205 demonstrates superior corrosion resistant properties to 316 and 316L in most environments
• Chromium, molybdenum, and nitrogen content also provide high resistance to pitting and crevice corrosion, even in oxidizing and acidic solutions
• Resistant to chloride stress corrosion cracking and temperatures of up to about 302°F (150°C)
• The presence of ferrite provides for good performance of Duplex 2205 in caustic environments

Heat Resistance:

• Similar to other duplex stainless steels, Duplex 2205 has good oxidation resistance at high temperatures
• Subject to embrittlement when exposed to temperatures above 572°F (300°C) even when exposed for short periods of time; Duplex 2205 is therefore not recommended for use above 572°F (300°C)

Chemical Properties:

Mechanical Properties:

Physical Properties:

2.What is the Difference between ANSI and ASME Flanges?

The short answer is not a lot. ANSI is an abbreviation for the American National Standards Institute, a non-profit organization composed of members from a wide cross-section of individuals associated with them in academia, government agencies, businesses and organizations that have an interest in establishing engineering standards to ensure that products, services and processes are consistent and predictable for all.

ASME is the abbreviation for the American Society of Mechanical Engineers a group of mechanical engineers and representatives from engineering companies–also non-profit–establishing standards and codes for mechanical devices such as boiler components and fasteners as well as actively promoting these standards through education, publications, certifications and conferences.

ASME focuses on educating and evaluating mechanical engineers to obtain the Professional Engineer (PE) license, and focuses more on finding “day-to-day” solutions to mechanical engineering problems.

ANSI tends to focus on establishing these standards for the United States, but also works to ensure that companies and individuals get accreditation within these standards. ANSI also focuses on promoting the interests of the United States as the global leader in engineering processes and standards.

Internationally, when discussing measurements the ANSI and ASME measurements are identical, except in a few rare instances, so these designations are interchangeable. Although ANSI and ASME both focus on different aspects of establishing engineering standards, they both work toward the same goal of assuring that all engineers, both in the U.S. and internationally follow these same universal standards to assure quality and consistency for all mechanical devices and products.