04
Mar
Duplex and Super Duplex Stainless Steel Duplex stainless steels earn their name as they have a two-phase microstructure that consists of grains of 50 austenitic and 50 ferritic stainless steel. The grade is characterized by very good chloride corrosion resistance combined with very high mechanical strength.
The properties of duplex stainless steels are achieved with an overall lower alloy content than similar-performing super-austenitic grades making their use cost-effective for many applications.
Super duplex stainless steel. SAF 2507 UNS S32750 is a super-duplex stainless steel. A high-alloy duplex steel with a PRE value of min. The grade is characterized by very good chloride corrosion resistance combined with very high mechanical strength.
Stainless Steels Super-Duplex Stainless Steels and their characteristics The first-generation Duplex stainless steels were developed more than 70 years ago in Sweden for use in the sulfite paper industry. Duplex alloys were originally created to combat corrosion problems caused by. Super duplex stainless steels are generally more complex more highly alloyed materials with PREn Pitting Resistance Equivalent number 400.
Making them suitable for demanding applications such as offshore marine engineering. Duplex and Super Duplex Stainless Steel Duplex stainless steels earn their name as they have a two-phase microstructure that consists of grains of 50 austenitic and 50 ferritic stainless steel. About Duplex Stainless Steel 2507.
Duplex Stainless Steel 2507 is an austenitic ferritic stainless steel that provides extensive strength and corrosion resistanceThe presence of chromium nickel molybdenum and nitrogen elements provides outstanding resistance to general and localized corrosion. Duplex 2507 UNS S32750 is a super duplex stainless steel with 25 chromium 4 molybdenum and 7 nickel designed for demanding applications which require exceptional strength and corrosion resistance such as chemical process petrochemical and seawater equipment. Since the launch of the rst duplex stainless steel in the 1960s Sandvik has been at the forefront of duplex development.
Today as a major supplier of duplex stain- less steels Sandvik has enjoyed a steady and growing market share due to its broad range high quality and product consistency from delivery to delivery. Fatigue and fatigue corrosion resistance of stainless steels are enhanced by the use of duplex grades higher mechanical properties chromium content and duplex microstructure S32304 316L 317 LN 316L 25 Mo 200 300 S31803S32205 400. Ability of superduplex stainless steel to tolerate a wide range of marine service environments without suffering localised corrosion.
Seawater crevice corrosion stainless steels desalination MIC INTRODUCTION Superduplex stainless steels have been used in seawater service since 1986 as castings and since 1990 as wrought product. 4Nippon Steel Sumitomo Metal Corp Japan 5SL Consulting SA Switzerland Abstract In seawater handling systems the available well tubing materials are Glass Reinforced Epoxy lined low alloy steel or Corrosion Resistant Alloys CRA such as super duplex stainless steel. Super Duplex Seamless Welded BW Fittings SAF 2507 is a registered trademark for Sandvik This is a Duplex alloy stainless steel designed to feature high strength resistance to pitting stress corrosion cracking erosion corrosion and corrosion fatigue crevice corrosion and strong weldability.
A super duplex stainless steel is generally classified as one having a PREN value greater than 40 and is typically based upon an alloy with 25 chromium or higher. This ensures a high level of corrosion resistance in a wide range of environments. Duplex stainless steel plate contains relatively high levels of chromium between 18 and 28 and low to moderate amounts of nickel between 15 and 8.
SAF 2507 is a Super Duplex Austenitic-Ferritic Stainless Steel is characterized by Excellent resistance to stress corrosion cracking SCC in chloride-bearing environments. Excellent resistance to pitting and crevice corrosion. High resistance to general corrosion.
Duplex stainless steel 22Cr is not immune to seawater and it does require cathodic protection. Superduplex 25Cr is resistant to seawater but in many cases is exposed to cathodic protection from adjacent structures or pipelines. The properties of duplex stainless steels are achieved with an overall lower alloy content than similar-performing super-austenitic grades making their use cost-effective for many applications.
The pulp and paper industry was one of the first to extensively use duplex stainless steel. For safety and stability materials with a PREN value greater than 40 such as S31254 super stainless steel pipe and 2507 super duplex pipe are often used in the seawater environment and offshore service. ASTM G48 standard specifies the precise pitting corrosion test procedure.
The company mainly produces and sells super duplex stainless steel special super austenitic stainless steel etc. Service 100 product quality protection From order to outbound shipment We provide reliable quality control for client to ensure 100 product pass rate. Duplex 2507 is a commonly used super duplex stainless steel.
Also sold as Alloy 2507 this alloy is used in situations where exceptional strength and corrosion resistance are in demand. Some of the applications and industries that utilize Duplex 2507 include. Chemical process industries Heat exchangers vessels and piping Desalination plants and other saltwater applications.