Knowledge Hub

What is the difference between duplex and super duplex stainless steels?

Duplex stainless steels are based around a composition of 22% chromium, whereas super duplex stainless steels are based around 25%.

What are the applications for duplex stainless steels?

2205 duplex is used in applications where Alloy 316L is not sufficient, but the cost differential to super duplex grades is too great.

Super Duplex

What is sigma phase in duplex stainless steel?

Sigma phase is a chromium-rich intermetallic phase found in stainless steels, that forms when an alloy is cooled slowly.

What does Hiduron® mean?

Hiduron is a trademark belonging to Langley Alloys Ltd and applies to a family of high-strength copper – nickel alloys.

Nickel Alloys

What is AMS5666?

AMS5666 is a specification covering the supply of an alloy similar in composition to Inconel 625 for aerospace applications. It covers multiple different product forms including forgings, extrusions and rings, although we are most interested in the stocking and distribution of solid bars. What is AMS5666? AMS stands for ‘Aerospace Material Specifications’ and AMS5666 is […]

Nickel Alloys

What is Inconel 625 Grade 2?

Inconel 625 is a nickel-based alloy, also known in the Unified Numbering System (UNS) as N06625, Alloy 625 or DIN 2.4856. The Two Grades of Inconel 625 According to ASTM B446 it can be supplied in two different conditions: Grade1 Inconel 625 Grade 1 is the product in Annealed condition. This is the most commonly […]

Copper Nickel Alloys

What is NES835?

NES835 is commonly used to describe the alloy better-known as Hiduron 191 (UNS C72420). The Hiduron family of alloys were developed by Langley Alloys in the late 1930s. This alloy was immediately adopted for naval applications during the second world war. Today, it continues to be used in a wide range of industries and applications. […]

Super Duplex

What is SAF32760?

SAF is an acronym of Sandvik Austenitic Ferritic and is a registered trademark of Sandvik Intellectual Property AB.

Super Duplex

What is S32520?

S32520 is the Unified Numbering System (UNS) designation for a super duplex stainless steel close to that of Ferralium 255.

Copper Nickel Alloys

What is DEF-STAN 02-835?

DEF-STAN is shorthand for Defence Standard, a series of material standards developed by the UK’s Ministry of Defence. What is DEF-STAN 02-835? Defence Standard 02-835 covers the “Requirements for High Strength Copper Nickel Manganese Alloy Forgings, Forging Stock Rods and Sections”, which is the alloy better known as Hiduron 191. This alloy was developed by […]

Super Duplex

What is SAF2205?

SAF2205 is a tradename of Sandvik Materials Technology, for their 22Cr duplex stainless steel (S32205, DIN 1.4462, ASTM A182 F60). SAF is an acronym of Sandvik Austenitic Ferritic, whilst 2205 is shorthand for the Unified Numbering System (UNS) designation S32205. The History of Duplex Stainless Steels Duplex stainless steels were developed in the 1930’s, for […]

Super Duplex

What is HVD-1?

HVD-1 is the designation of a super duplex stainless steel developed for use in fertiliser production.

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