Tag: duplex

Duplex Stainless Steels

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.

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.

Nippon Yakin Kogyo expands NORSOK-certified portfolio

Stainless Steel World Publisher -
Nippon Yakin Kogyo Co., Ltd. announced that it has recently expanded its NORSOK-certified range of products. Since March 2015, when the company announced the acquisition of the NORSOK standard certification for their general-purpose duplex stainless steel (S31803, S32205), super duplex stainless steel (S32750) and super austenitic stainless steel (S31254), they have worked to add certified sizes, expand the thickness range and add new steel grades.

United Performance Metals integrates to form UPM

Stainless Steel World Publisher -
United Performance Metals has recently declared the integration of Aerodyne Alloys, Plus Ten Stainless, United Performance Metals and Vulcanium Metals International, to form a single high performance metals company, United Performance Metals (UPM).

Outokumpu stainless steel rebar at Cromer coast

Stainless Steel World Publisher -
Outokumpu has recently delivered Forta DX 2304 duplex stainless steel rebar for the Cromer coast in the UK. Cromer is a well-known resort with a historic sea front and beloved beach, with original sea defences of a series of walls and timber groynes, some dating back to 1845.

New weld procedures for duplex and superduplex

Stainless Steel World Publisher -
Pruce Newman has recently completed a new set of qualified welding procedure specifications specifically for duplex and superduplex stainless steels.

Tinsley Bridge delivers orders for ATC

Stainless Steel World Publisher -
Sheffield, UK Engineering company, Tinsley Bridge has recently started delivering orders for ATC, which is a joint venture company between Alstom, TSO and Costain, as part of their work on the Crossrail project.

DNV GL reveals patterns behind failures

Stainless Steel World Publisher -
Learning from previous failures and accidents is very crucial in a lean and cost effective organisation and is often a fundamental requirement in regulations.

TISCO listed as one of the national key R&D scheme

Stainless Steel World Publisher -
The “high strength & high corrosion-resistant stainless steel and its applicationâ€? project jointly applied and participated in by many units amongst whom TISCO is listed as one of the national key R&D schemes for upgrade and industrialization of key basic material technologies.

Proposed ASTM specification to help engineers

Stainless Steel World Publisher -
ASTM International group has recently declared that it is creating a consolidated reference guide for engineers and consultants who want to use stainless steel in transportation and construction projects.

Rolled Alloys receives Nadcap reaccreditation

Stainless Steel World Publisher -
Rolled Alloys, suppliers of stainless steels, duplex, nickel, cobalt, and titanium alloys, has recently retained its Nadcap accreditation following a surveillance audit, demonstrating a continued investment in resources to meet stringent industry and customer requirements.

Outokumpu stainless steel strengthens dam locks

Stainless Steel World Publisher -
Outokumpu has recently delivered duplex stainless steel for the two locks, or spillway gates, in the upgraded Lossendammen dam structure in Central Sweden.
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The advantages of Duplex Stainless Steels

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. There are several variants available, such as Duplex 2205, Superduplex 2507 or lean duplex with lower nickel content.

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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