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Stainless Steels

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.

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.

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.

Super Duplex

What is Uranus 52N+?

Uranus 52N+ is a former-trademark of Industeel. The product is now promoted as UR2507Cu. It designates a type of  super duplex stainless steel, closely following UNS S32550. This product is better known on the marketplace as Ferralium 255. Ferralium 255 (UNS32550, DIN 1.4507, F61) is the original SDSS, developed by Langley Alloys in the 1960’s. […]

Super Duplex

What is UR2507Cu?

UR2507Cu is a trademark of Industeel. It was formerly known as UR52N+ or Uranus 52N+. It designates a super duplex stainless steel, closely following UNS S32550. On the market, this material is better known as Ferralium 255. The History of Ferralium 255? Ferralium 255 (UNS32550, DIN 1.4507, F61) is the original SDSS, developed by Langley […]

Super Duplex

What is S32550?

S32550 is the Unified Numbering System (UNS) designation for the original super duplex stainless steel, best known as Ferralium 255.

Stainless Steels

What is 22Cr?

22Cr is shorthand for a stainless steel based upon a composition of 22% chromium – a duplex stainless steel. 

Super Duplex

What is 25Cr?

25Cr is shorthand for a kind of super duplex stainless steel, based upon a composition of 25% chromium. How Does 25CR differ from Standard Stainless Steel? Chromium is a normal component of Stainless Steel — where it is used to increase the steel’s resistance to oxidation. An increase in the level of chromium increases this […]

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