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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Swiss-based steel-profile Montanstahl has built a new corporate head office with a novel duplex stainless steel skin as a reminder of the many possibilities of duplex.
Helical Solution has launched the seven-flute HSF-7 end mill designed for finishing steel and exotic materials with increased feed rates, suitable for all finishing applications but especially useful for the demanding aerospace industry.
Greenville Tube, a RathGibson company, and manufacturer of small diameter stainless steel and nickel alloy seamless and welded and drawn tubing and pipe, has received ISO 9001:2008 Certification.
Sandvik has used its extensive metallurgic experience and research and development to produce and publish a new brochure which outlines the company's extensive steel products and capabilities.
UK-based Huntingdon Fusion Techniques Ltd (HFT) is now able to provide a wide range of trailing shields to fit any make of TIG (GTAW), MIG or Plasma (PAW) welding torch for manual or automatic welding.
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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