Duplex stainless steels have a ferritic-austenitic microstructure, in roughly equal proportions 50% ferrite and 50% austenite. Duplex combines many of the attractive properties of ferritic and austenitic stainless steels into one.
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Different variants for Duplex
Duplex stainless steels are designed to provide better corrosion resistance, in particular to stress corrosion and pitting corrosion. The microstructure leads to higher strength than standard austenitic stainless steels such as Type 304 or 316. Duplex stainless steels have become more and more popular in recent years. There are several variants available, such as Duplex 2205, Superduplex 2507 or lean duplex with lower nickel content.
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A.D. Tubi USA was founded in 2018 as an extension of A.D. Tubi Inossidabili to support the growing demand for high quality specialty welded tubes in the North American markets.
Stainless Foundry & Engineering, Inc. (Milwaukee, Wisconsin, USA) as of November 2018 has greatly expanded its scope of approval for materials as assessed for the Pressure Equipment Directive (PEDX) 97/23/EC and 2014/68/EU.
Bespoke stainless steel fabricators, Axium Process, specialise in hygienic engineering design, fabrication and system solutions utilising a wide range of corrosion resistant superalloys including exotic alloys.
The South African stainless steel industry is in an early developmental stage with regards to construction and cladding, despite many architectural projects having been completed over the past few decades, says South African Stainless Steel Development Association (Sassda) Western Cape regional manager Michel Basson.
Henkel has helped Envases Técnicos Zaragoza S.L. (Entinox), a Spanish manufacturer of stainless steel beer barrels, set up an innovative pickling and passivating line using a nitric acid-free Bonderite process.
Sandvik Materials Technology has appointed Langley Alloys as its preferred partner for the distribution of duplex and super duplex stainless steels to the NAFTA region.
The winners of the 2018 Sassda Columbus Stainless Awards have been announced at a glittering banquet in Johannesburg, South Africa, with 189 entries from 53 companies resulting in a stellar list of more than 60 finalists.
At each Duplex World Seminar, a Lifetime Achievement Award is bestowed on an individual who has made an outstanding contribution to the global materials industry.
Axium Process specialise in hygienic engineering design, fabrication and system solutions utiilising a wide range of corrosion resistant superalloys including exotic alloys; Hastelloy®, Duplex®, Inconel®, and Monel® as well as high performance engineering plastics such as PEEK®.
Corrosion Resistance: Duplex stainless steel has excellent corrosion resistance due to its high chromium and molybdenum content. It is particularly resistant to stress corrosion cracking and pitting, which makes it suitable for use in harsh environments.
Strength: Duplex stainless steel is much stronger than conventional austenitic stainless steels, which allows for thinner and lighter constructions without sacrificing durability.
Toughness: Duplex stainless steel has a high toughness, which means it is resistant to brittle fracture and impact. This property makes it suitable for use in cryogenic applications.
Cost-effectiveness: Although duplex stainless steel is more expensive than conventional austenitic stainless steels, its superior properties can lead to cost savings in the long run by reducing maintenance and downtime.
Versatility: Duplex stainless steel can be used in a wide range of applications, including chemical processing, oil and gas, marine, and pulp and paper industries. It is also used in construction and architecture due to its aesthetic appeal.
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