Dear all,
Our welding consumables intended for use in duplex stainless steels will normally give a weld metal with FN 35 -50. The weld metal mechanical properties are strongly dependent on ferrite number. Higher ferrite numbers, > 50, gives higher tensile strength, lower elongation and maybe also lower Charpy values.
Welding with too low heat input will give a weld metal with too high FN, resulting in bad mechanical properties. Too high heat input will give too much brittle intermetallic phases. Since the ferrite is transformed into brittle intermetallic phase, the FN measured in the weld will be low..
Measurement of ferrite number in real weldment can be carried out with a precision of +/-10%, according to investigations carried out by IIW.
Best regards,
Claes Gillenius
Development Engineer, MMA. (Spec. stainless and non Fe-alloys)
Direct tel: +46 (0)31 509315
Mobile +46 (0)707532012
Company ESAB AB
Address Box 8004, 402 77 Gothenburg, Sweden
Lindholmsallén 9
Company reg number 556005-7738
| pankaj.johri@in.transport.bombardier.com Sent by: materials-welding@googlegroups.com 2010-02-26 06:15
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Hi,
We are welding duplex stainless steel.
To control the parameters of welding, we are measuring ferrite number of weld.
Can anybody tell us how acceptable values of ferrite numbers are decided.
Regards,
Pankaj
Please consider the environment before you print / Merci de penser à l'environnement avant d'imprimer
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