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Stainless Steels

What are the advantages and disadvantages of duplex stainless steel?

The main advantage of duplex stainless steel is its ability to provide extremely cost-effective performance compared with other all alloys.

What are the chloride limits for duplex stainless steel?

One of the main risks of failure for stainless steels is from chloride stress corrosion cracking, but duplex grades are generally resistant.

Can heat treatment of duplex stainless steel change its properties?

Heat treatment of duplex stainless steel is usually restricted to their initial production, in the form of solution annealing.

What is ferrite content?

Ferrite content is a measure of the amount of ferrite in a steel. Ferrite is one form of microstructure that may exist within a steel.

What is ferrite content in duplex stainless steel?

Ferrite content in duplex stainless steels should be close to 50%, and within the range of 35-60%, in order to optimise their properties.

What is ASTM A473?

ASTM is the American Society for Testing and Materials, and A473 is the ‘Standard Specification for Stainless Steel Forgings’.

What is ASTM A240?

ASTM A240 is the ‘Standard Spec for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip for Pressure Vessels and General Use’.

What is ASTM A790?

A790 is the ‘Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe’.

What is ASTM A479?

ASTM A479 is the ‘Standard Specification for Stainless Steel Bars and Shapes for use in Boilers and Other Pressure Vessels’.

What is ASTM A276?

ASTM is the American Society for Testing and Materials, and A276 is the ‘Standard Specification for Stainless Steel Bars and Shapes’.

How does 316 compare with super duplex stainless steels?

Super duplex stainless steel is 3-4x higher yield strength, 2x the resistance to pitting corrosion, yet less than twice the cost than 316.

How does 904L compare with super duplex stainless steels?

Super duplex stainless steels have been used to substitute 904L (UNS N08904, 1.4539) austenitic stainless steels for many applications.

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