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Super Duplex Stainless Steel
Super Duplex Products
Duplex stainless steels are becoming more common. They are being offered by all the major stainless steel mills for a number of reasons:
- Higher strength leading to weight saving
- Greater corrosion resistance particularly stress corrosion cracking
Summary of Duplex Characteristics
| Characteristic | Benefit |
|---|---|
| High inherent corrosion resistance | No need to protect by surface coating |
| Outstanding pitting/crevice resistance | Ideal for oil & gas, marine & defence applications |
| Excellent corrosion resistance in acids | Ideal for chemical industry |
| High resistance to stress corrosion cracking | Suitable for highly loaded components in chloride environments |
| High resistance to chloramines at high temperature / humidity | Suitable for use in safety critical supports in swimming pools |
| High mechanical strength | Scope for smaller diameter and hardware |
| Good fatigue strength | Applicable for cyclically loaded assemblies |
| High modulus of elasticity | Low propensity to stretch |
S3i can manufacture wire rope assemblies and fittings in super duplex materials to order.
Please contact us with your enquiry.
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Super Duplex Data Sheet download here
The British Stainless Steel Association provide this useful technical page: Duplex Stainless Steels - A Simplified Guide
Available Specifications of Duplex and Super Duplex Stainless Steel
| Euro Specification | U.S Specification | Composition | Benefit | Application |
|---|---|---|---|---|
| EN ASTM 1.4501 A135 F55 | UNS S32760 | Super Duplex Stainless Steel. 25% chromium super duplex (austenitic/ferritic) steel with 0.75% tungsten and copper | Good strength/ductility combined with high corrosion resistance | For Oil & Gas, defence, pollution control, chemical/ petrochemical and marine applications |
| EN ASTM 1.4462 A135 F51 | UNS S31803 | Duplex Stainless Steel. 22% chromium duplex (austenitic/ ferritic) steel (2205 type) | Moderate/good strength and good general corrosion/ stress corrosion cracking resistance | For Oil & Gas, brewing, power generation and chemical industry applications |
| EN ASTM 1.4410 A135 F53 | UNS S32750 | Super Duplex Stainless Steel. 25% chromium copper-free super duplex (austenitic/ferritic) steel (also known as 2507) | Good strength and ductility combined with high marine corrosion resistance | Primarily used for Oil & Gas and marine applications |
| EN ASTM 1.4507 A135 F61 | UNS S32550 FERRINOX® 255 | Super Duplex Stainless Steel. High performance 25% chromium super duplex (austenitic/ferritic) steel with 1.75% copper | Good strength/ductility combined with high resistance to all forms of corrosion | For Oil & Gas, defence, nuclear, chemical/petrochemical and marine applications |
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