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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After an intensive 3 day survey of all aspects of Quality management Systems and Technical applications including manufacturing, heat treatment and testing procedures, IPP Scomark has been added to the BP Global Approved Vendor List to supply Duplex and Super Duplex materials.
Piping components in duplex, super duplex (and 31254) used in Norwegian offshore activities have been constantly under very tight scrutiny due to the critical nature of the installations.
Xinjiang Tianrui Continuous Casting Special Steel Group Co. has partnered with Xinjiang Production and Construction Group State-Owned Assets Management and Operation Co.
A wood waste-to-energy plant worth USD 80 million is being proposed for the White Swan area. The plant, using woody debris from Yakama Indian Nation forest lands, would employ about 30 people and be in operation by the fall of 2013.
Sulzer’s Customer Support Services in Leeds (UK) and Sulzer Pumps Norway AS has won a contract for a retrofit-upgrade programme in Statoil’s Sleipner gas field based on their ability to achieve a much higher performance in a series of replacement cartridge pumps.
Schroeder Industries has released its RLD Series Top-ported duplex filter for return line applications. Certain hydraulic systems require continuous, uninterrupted operation. In this situation, shutting down the system to change the filter element is not an option.
Outokumpu will deliver special stainless quarto plates to the new World Trade Center transit terminal, in New York at Ground zero. The company will deliver around 340mt of stainless steel quarto plates to Cimolai Spa of Italy, one of the main steel manufacturers for the new World Trade Center transit terminal.
Avesta Welding has expanded its already extensive duplex product range by introducing a new super duplex flux cored wire: Avesta FCW 2507/P100-PW. The wire is of the rutile type and has been specially developed for the positional welding of steels such as 2507, 1.
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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