A nice synopsis of the formation and consequences of delta ferrite (or lack thereof) is contained in the AWS Handbook, Volume 4 – Part 2 starting on page 261.
John A. Henning
Welding & Materials
From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of SV Swamy
Sent: Wednesday, January 16, 2013 12:41 AM
To: material...@googlegroups.com
Cc: rudolf saldanha; c sridhar
Subject: [MW:16516] Re: Delta Ferrite Test on SS 316L
Delta Ferrite phase is formed when the liquid metal starts cooling and continues as ferrite without getting transformed into austenite. The prefix delta differentiates this ferrite (its formation stage) from the room temperature stable ferrite (alpha).
As far as measurement of ferrite is concerned, using the Schaeller-Delong Diagrams is one method and using a ferrite meter is another method. Our experience shows that the values obtained by both the methods are quite different esp. when ferrite values in the lower ranges of 0 to 10% are involved.
Which method is to be used should be specified as per some industry standard or mutually agreed upon by the vendor and the customer.
Regards
Swamy
Retd. QA Metallurgist
Nuclear Fuel Complex
Hyderabad, India
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Dear sir
Regarding to acceptance values of delta ferrite FN for welded fitting of material grade A403 wp304L of normal temp. Sevice.
Plz clarify more regarding to delta ferrite determination for ss material.
Brijesh patel
Indian register of shipping,baroda