Re: [MW:31825] Ferrite requirements

Dear,

Duplex stainless steels are a family of corrosion-resistant alloys, which typically contain 50 % austenite and 50 % ferrite. Phase balance is important in duplex stainless steels as it helps to impart optimum mechanical properties and corrosion resistance. In many applications it is necessary to weld duplex stainless steels. Welding involves a thermal cycle that may alter the phase balance, and so it is necessary to assure that phase balance is still within acceptable ranges in the heat-affected zone and the weld metal. For example, high ferrite content may lead to lower toughness and high austenite content may lead to increased susceptibility to chloride stress corrosion cracking. Quality control of welded duplex stainless steels usually requires confirmation of an acceptable phase balance, by ferrite measurement  

Thanking you,

MTech (Metallurgical & Materials Engineering)

Indian Institute of Technology Kharagpur (IIT)

On Thu, Dec 10, 2020 at 6:34 AM Venkadesh Lakshmanan <venkadeshmech@gmail.com> wrote:

Dear Experts,

Can you please give some guidance regarding ferrite requirements for duplex stainless steel piping as per ASME B31.3. I mean what sub standards to refer, why ferrite test to be performed, either ferrite number or percentage results referring really what is in it. I understood that it is a face (bcc or fcc) , but how to describe it. Can you please give some details to know about this.

Regards,

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