A Brief History and Development of Duplex 2205 and 2507 Stainless Steel
The development of dual-phase steel originated in the 1930s. In 1936, the Uranus50 steel grade obtained France's first dual-phase steel patent. So far, three generations of dual-phase steel have been developed for CV548. The first generation of dual-phase steel was based on Sweden's 3RE60 and the United States' AISI329 is represented. RE60 is a duplex steel developed specifically to improve resistance to chloride stress corrosion cracking. AISI329 duplex steel is widely used in heat exchanger pipes in nitric acid plants. The first generation of duplex steel has good performance characteristics, but There are limitations in the welded state. Due to excessive ferrite, the toughness of the heat affected zone of the weld is low, and the corrosion resistance is significantly lower than that of the base metal. These limitations limit the application of the first generation of dual-phase steel to the non-welded state. some specific applications.
In 1968, the invention of argon-oxygen decarburization, a stainless steel refining process, made it possible to produce a range of new stainless steel grades. One of the many advances brought about by AOD was the addition of the alloying element nitrogen. The addition of nitrogen to duplex steels enables welding The toughness and corrosion resistance of the heat-affected zone in the state are close to those of the base material. Nitrogen also reduces the formation rate of harmful intermetallic phases. Nitrogen-containing duplex steel is called the second generation duplex steel. 2205 duplex stainless steel is the second generation duplex steel. The representative steel type of the second generation duplex steel is widely used in offshore oil platforms, chemicals, papermaking and other fields. The super duplex steel developed in the late 1980s belongs to the third generation duplex steel. The representative grade is 2507 duplex Stainless steel, UR52N, Zero 100, etc. This type of steel is characterized by low carbon content, high molybdenum and high nitrogen. This type of steel has excellent pitting corrosion resistance. The pitting corrosion equivalent is greater than 40.
Duplex 2205 and 2507 Stainless Steel Today
While further consolidating applications in the petrochemical industry, we will continue to expand applications in the fields of oil and gas transportation, chemical tanker manufacturing, nuclear power, equipment manufacturing, and construction, and continue to explore the international market. From the development of dual-phase steel at home and abroad, it can be seen 2507 stainless duplex steel is a high-performance stainless steel product that saves resources. Its production and application are in line with the future development direction of stainless steel. Duplex steel is a high value-added product. Its development and production not only reflect the technical level of stainless steel manufacturers, but also Create more economic benefits for the company. Although duplex stainless is only a small part of the modern stainless steel consumer market, its purpose is very effective. This special steel is used to make everything from pipes, to finned tubes, to water storage Tanks and distribution pipes, and more.
With more advancements, more and more industries should be able to benefit from duplex stainless steel. It offers high strength and good corrosion resistance at such an affordable price, making it a very valuable material for the future.
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