Alloy 2205 uns s32305s31803 is a 22% chromium, 3% molybdenum, 56% nickel, nitrogen alloyed duplex stainless steel plate with high general, localized, and stress corrosion resistance properties in addition to high strength and excellent impact toughness. Nov 20, 2017 the name duplex is sometimes used to describe alloy 2205 uns s31803 or uns s32205, however duplex is a family of alloys ranging from lean duplex and standard duplex to super duplex stainless steel. The pulp and paper industry was one of the first ones to use extensively duplex stainless steel. The article also discusses the heat treatments applied to duplex stainless steels, which involve soaking and annealing, achieving the austeniteferrite balance, precipitation of intermetallics, and alpha prime precipitation. The 97 pages book is totally devoted to the duplex stainless steel grades. The work hardening exponents of both steels were compared, being higher in the duplex steel than in the lean duplex grade. History of stainless steel melting and refining the wild process the rustless process the linde argonoxygen decarburization aod process 11. The world of stainless steel a brief overview of applications history of stainless steels a little metallurgy basic concepts, atoms, compounds etc why is stainless steel stainless. In all these examples, topics like welding, corrosion resistance and mechanical strength properties mainly in the fatigue domain are crucial. Titan regularly designs, engineers and fabricates the following applications of duplex stainless steel and custom process equipment. Duplex stainless steels are not covered by the standard aisi 200, 300, or 400 groups.
Due to their ferriticaustenitic microstructure, they possess a higher mechanical strength and a better corrosion resistance than standard austenitic steels. Duplex stainless steels uhligs corrosion handbook, third. Martensitic stainless steel an overview sciencedirect. Heat treating of austenitic and duplex stainless steels1. Although the pulp and paper industry was one of the first industries to adopt duplex stainless steels, it is still important to analyze duplex stainless growth and development. The history of duplex stainless steel great plains stainless. In terms of a common engineering material, modern duplex stainless steels emerged in the early 1980s, developed from cast alloys. From a practical standpoint, ferrite can be considered pure iron at a low temperature. They are being offered by all the major stainless steel mills for a number of reasons. This book provides a fascinating glimpse into a vital material that we may take for granted today. Duplex stainless steels are a group of materials offering good corrosion resistance, improved mechanical properties with good ductility and toughness. Duplex alloys were originally created to combat corrosion problems caused by chloridebearing cooling waters. Super duplex with very high resistance to pitting and stress corrosion. The first reference book to be published on the increasingly popular duplex stainless steels, it will be widely welcomed by metallurgists, design and materials engineers, oil and gas engineers and anyone involved in materials development and properties.
Stainless steels may be classified by their crystalline structure into four main types. Introduction worldwide, in industry, in business and in the home, metals called stainless steels are used daily. Although duplex stainless steels are highly corrosion and oxidation resistant they cannot be used at elevated temperatures. Duplex stainless steel was first developed in france and sweden in the 1930s, with the early grades becoming a forerunner for aisi 329. They achieve their stainless characteristics through.
The history of stainless steel is dedicated to my dear wife joan inman cobb. The article also discusses the heat treatments applied to duplex stainless steels, which involve soaking and annealing, achieving the austeniteferrite balance, precipitation of. Asm specialty handbook stainless steels the best singlevolume reference on the metallurgy, selection, processing, performance, and evaluation of stainless steels, incorporating essential information culled from across the asm handbook series. Two new classes of stainless steel duplex stainless steel precipitationhardening steel 12. Overwhelmingly, the most common type is the familiar austenitics, but the duplex grades considered in this webinar were first developed in the 1930s. Duplex stainless steel dual phase steel s32750 s32205.
Duplex stainless steels are virtually immune to stress corrosion cracking the achilles heel of common austenitic stainless steels and are highly resistant to pitting and crevice corrosion. An introduction to super duplex stainless steels super duplex stainless steels and their characteristics the firstgeneration duplex stainless steels were developed more than 70 years ago in sweden for use in the sulfite paper industry. Austenitic stainless steel is a specific type of stainless steel alloy. Welding metallurgy and weldability of stainless steels, the first book in over twenty years to address welding metallurgy and weldability issues associated with stainless steel, offers the most uptodate and comprehensive treatment of these topics currently available. A short account was given in my page on stainless steel welding. Two times stronger than ferritic or austenitic stainless steel grades. Stainless steel is an alloy steel containing at least 10. Applications of duplex stainless steel titan fabricators. An introduction to their metallurgy and corrosion resistance roger a. The picture shows the yellow austenitic phase as islands surrounded by the blue ferritic phase. Duplex can be welded to carbon and low alloy steels as well as austenitic steels such as 316. Includes additional data and reference information carefully selected and adapted from other authoritative asm sources. Ferritic stainless steel contains higher chromium content than the martensitic stainless steel.
In metallurgy, stainless steel, also known as inox steel or inox from french inoxydable inoxidizable, is a steel alloy, with a minimum of 11% chromium content by mass and a maximum of 1. This handbook provides a guide to the history, production, perfor. Hyperduplex stainless steel hdss is a new type of duplex steel that offers pitting resistance numbers pre higher than 48. Its high mechanical strength is similar to that of other duplex grades and its good corrosion resistance is on par with that of. Alloy 2205 duplex stainless steel plate sandmeyer steel. Jan 27, 2017 duplex stainless steel is considered an alternative to the expensive nickel alloys and high alloy austenitic stainless steel materials used in the most demanding applications. Martensitic grades include 420 stainless steel, which is used in engineering applications like shafts and 440c stainless steel the hardest and most abrasion resistant of all the stainless steel. The following list of books has been recommended by our technical team as well as visitors to our site. While not as easily welded as austenitic steel grades such as stainless 316, low thermal expansion properties in duplex stainless steel means distortion and residual stress are reduced after welding. Hot and cold rolled coil, strip, sheet, precision strip, quarto plate, bar, wire rod, rebar and semifinished long products.
For any given stainless steel, the mechanical properties, weldability, corrosion resistance, and wear and abrasion resistance depend to a large extent upon its microstructure, which in turn depends upon the alloy composition, the steel making or casting practice, the thermal history, and the finishing treatment. If an internal link led you here, you may wish to change the link to point directly to the. A wide variety of duplex stainless steel pipe price options are available to you, such as type, standard, and certification. The corrosion resistance of duplex alloys depends primarily on their. Duplex stainless steels dsss are chromiumnickelmolybdenumiron alloys that are usually in proportions optimized for equalizing the volume fractions of austenite and ferrite. Duplex stainless steel have a structure that contains both ferrite and austenite. This disambiguation page lists articles associated with the title duplex. This paper presents an overview of duplex stainless steels dss with particular emphasis on super dss, i.
C for 4 hours, 8 hours and 12 hours promoted significant hardening with small decrease of ductility. It should be noted that the data are typical or average values. Stainless steels specifications, grades and properties. The firstgeneration duplex stainless steels were developed more than 70 years ago in sweden for use in the sulfite paper industry. Stainless steel, called the miracle metal and the crowning achievement of metallurgy by the prominent metallurgist carl zapffe, is a material marvel with an equally fascinating history of people, places, and technology. The use of duplex stainless steels has grown rapidly in the last 10 years, particularly in the oil and gas industry, chemical tankers, pulp and paper as well as the chemical industry. This article discusses the composition, characteristics, and properties of the five groups of wrought stainless steels. Possessing these characteristics, it is not surprising to find the majority, but by no means all, of. Should you have a book or source that you would like to recommend, please send details to the webmaster. Normally the chromium content of the ferritic stainless steel ranges from 14 to 27 wt%. Duplex stainless steels definition for dualphase material systems. To help you better understand your choices, heres a quick explanation of the most common types of stainless steel and their properties.
An introduction to superduplex stainless steels superduplex stainless steels and their characteristics the firstgeneration duplex stainless steels were developed more than 70 years ago in sweden for use in the sulfite paper industry. Duplex stainless steel is considered an alternative to the expensive nickel alloys and high alloy austenitic stainless steel materials used in the most demanding applications. Ferritic stainless steel an overview sciencedirect topics. Picking the right grade of stainless steel requires knowing what your options are. Youll find more information about applications of duplex stainless steel and common grades in the technical resources section on this site. Low alloyed, general purpose duplex stainless steel. The term duplex stainless steel dss refers to the austeniticferritic. In all these examples, topics like welding, corrosion resistance and mechanical strength. Duplex stainless steel saw its conception in the early 1930s. Duplex stainless steel duplex plate brown mcfarlane. The history of stainless steel celebrating 100 years. Duplex stainless steel get their name from the fact that they contain both a ferritic and austenitic microstructure.
Austenitic stainless steels possess austenite as their primary crystalline structure facecentered cubic. Few stainless steels contain more than 30% cr or less than 50% iron. Stainless steel, called the miracle metal and the crowning achievement of metallurgy by the prominent metallurgist carl zapffe, is a material marvel with an equally fascinating history of people, p. This early version of the alloy wasnt a patch on the versions we see today, but it did see a few different uses, nonetheless. Duplex grades stainless steel grades midway metals. In 1919, elwood haynes obtained a patent on martensitic stainless steel, in 1929 william j. The authors emphasize fundamental metallurgical principles governing microstructure evolution and property development of. Within the modern duplex family, these duplex stain less steels exhibit both the highest levels of corrosion pitting resistance as well as mechanical strength. Tables and charts, which are not given references in this publication, were obtained either from the asm international book or from other sources within the stainless steel industry in the united states. However, the susceptibility of super % cr to cracking at high temperature and high chlorides in the presence of an h 2 s partial pressure higher than 0. The properties of duplex stainless steels are achieved with an overall lower alloy content than similarperforming superaustenitic grades, making their use costeffective for many applications. Duplex stainless steels contain about equal amounts of ferrite and austenite. Over the past century, we have been a leader of innovation in the steel industry, provided jobs to hundreds of thousands of people and given back to our communities.
Precipitationhardenable stainless steels are chromiumnickel alloys containing. Duplex alloys were originally created to combat corrosion problems caused by chloridebearing cooling waters and other aggressive chemical process fluids. Cm cm cooling rate corrosion rate corrosion resistance corrosion tests crack propagation crevice corrosion curve ductility duplex alloys duplex stainless steels duplex steels duplex structure effect electrodes elongation embrittlement environments. The name duplex is sometimes used to describe alloy 2205 uns s31803 or uns s32205, however duplex is a family of alloys ranging from lean duplex and standard duplex to super duplex stainless steel. Duplex alloys have higher strength and better stress corrosion cracking resistance than most austenitic alloys and greater toughness than ferritic alloys, especially at low temperatures. Kroll of luxembourg was the first to discover precipitationhardening stainless steel, and in 1930 duplex stainless steel was first produced in sweden at the avesta ironworks. 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 2. Weldingduplex stainless must follow precise instructions. About 76% of these are stainless steel pipes, 8% are steel pipes. Bssa understanding stainless steel centenary edition. The first reference book on this relatively new engineering material.
While most have uns numbers, some are also referred to by their chromium and nickel contents. Introduction to stainless steels asm international. Stainless steels have been in use for more than 100 years. Stainless steels are most notable for their corrosion resistance, which increases with increasing chromium. The new super martensitics are considered an attractive alternative to duplex stainless steel 6. Standard duplex stainless steel high resistance to pitting and stress corrosion. Possible precipitations in super duplex stainless steels within 25 40 minutes, while 2205 is 1 hour and 2304 is 8 hours for significant precipitations. Welding metallurgy and weldability of stainless steels. Sigma phase is a nonmagnetic intermetallic phase composed mainly of iron and chromium which forms in ferritic and austenitic stainless steels during exposure at temperatures of 1050 to 1800 degrees f 560 to 980 c it causes loss of ductility, toughness and is generally strain intolerant, or brittle at. Introduction to stainless steels stainless steels are ironbase alloys that contain a minimum of about 12% cr, the amount needed to prevent the formation of rust in unpolluted atmospheres hence the designation stainless. Duplex stainless steels a simplified guide duplex stainless steels a simple guide. May 20, 2005 martensitic grades include 420 stainless steel, which is used in engineering applications like shafts and 440c stainless steel the hardest and most abrasion resistant of all the stainless steel.
This type of steel is now increasing its application and. Duplex stainless steels are called duplex because they have a twophase microstructure consisting of grains of ferritic and austenitic stainless steel. The history of stainless steel provides a fascinating glimpse into a vital material that we may take for granted today. Outokumpu is a global stainless steel manufacturer. At present, they can be purchased from amazon by clicking on their respective hyperlink below. Tensile properties of duplex uns s32205 and lean duplex uns.
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