Features and Applications of Super Duplex S32750 Tubing

Features & Applications of Super Duplex S32750 Tubing

The Super Duplex grades have a higher chromium, nickel, and molybdenum content than conventional austenitic stainless steels. The range of these elements in the alloy increases the corrosion resistance and mechanical strength. These grades are beneficial in applications that demand high tensile and yield strength. They are also highly resistant to inorganic acids and chlorides. UNS S32750 is a chromium-molybdenum-vanadium (C-M-V) alloy that contains 4% molybdenum and 7% nickel. This type of stainless steel is highly suited to applications that require high mechanical strength and high resistance to chloride stress corrosion. It can be welded or seamless.

Chemical Properties

A high-performance alloy with outstanding localised corrosion resistance is called Super Duplex S32750 Tubing. Besides the high chromium, nickel, and molybdenum content, the Super Duplex S32750 Tubing exhibits high corrosion resistance and cracking. It can even withstand temperatures of up to 150°C without any problems. UNS S32750 is one of the most commonly used grades of the super duplex. It is characterized by a balanced dual-phase microstructure that is 50:50 austenite and ferrite. The alloy is resistant to stress corrosion cracking and is a good choice for fire-fighting, RO-plant piping, and heat exchangers. For the offshore oil and gas sectors, it is advantageous. Low thermal expansion coefficient is a property of the alloy. Furthermore, the duplex structure offers outstanding resistance to chloride stress corrosion cracking. Super Duplex S32750 Tube is perfect for applications that demand strong corrosion resistance because of its high chromium, nickel, and molybdenum concentrations. They are particularly well suited for uses involving seawater.


Due to the addition of chromium and nitrogen to the composition, this S32750 pipe resists corrosion. Hydrogen ions cannot penetrate due to the high chromium concentration. Additionally, it creates a thin layer of surface protection. Better resistance to crevice corrosion results from the nitrogen content. A super duplex alloy with greater corrosion resistance than ordinary duplex grades is UNS S32750. In settings with sulfuric and chloride, it has good corrosion resistance. High corrosion resistance and exceptional weld ability define this alloy. Compared to other duplex grades, it offers higher corrosion resistance in seawater. In comparison to 2205(r) duplex, it is also more resistant to pitting corrosion. Additionally, it is more affordable than high-nickel alloys.

General Properties

Stainless steels generally have a long history of performing well above and below the boiling point of water. Although there are exceptions to the rule, one cannot deny that the water temperatures are tamer than the air temperatures of a typical office building or airport. That said, there is no denying that high load-bearing applications in an interior swimming pool are a particular case. Luckily for the industry, a bit of knowledge on the subject can go a long way in the name of longevity and cost savings. It is also important to mention that not all stainless steel is created equal. For example, some alloys are brittle to the point of being a nuisance. This consideration makes the selection of a suitable material critical. Having the proper alloys in your arsenal can save you time, money, and hassle. The best metals have been per-treated with the appropriate phosphate and chloride mixtures.


Stainless steel Super Duplex S32750 Tubing is a high-performance grade pipe used in various engineering applications. It is helpful in offshore technology, chemical process equipment, desalination plant, cargo tanks, flue-gas cleaning, nuclear power projects, reactor tanks, and other oil and gas equipment. Super Duplex Tubes are made of high chromium and molybdenum content. This combination of metals provides exceptional resistance to chloride stress corrosion cracking and other stress-related corrosion issues. Also, these properties make this material ideal for piping in chloride-containing environments. These materials are used to fabricate heat exchangers, vessels, subsea control lines, chemical tankers, and umbilical.