ferrite testing ferrite testing engineer54 (Mechanical) (OP) 20 Jan 16 17:25 Is ferrite test of Austenitic stainless steel done before and after welding or just after? What is the optimal ferrite so as to avoid cracking. RE: ferrite testing metengr (Materials) 21 Jan 16 13:12 It is done after welding, namely the weldment itself. 5 FN or higher, depending on the weld filler metal. RE: ferrite testing EdStainless (Materials) 22 Jan 16 22:59 It depends on the alloy and the size of the weld (and how tightly constrained it is). Depending on conditions specs usually require a 4 or 5 minimum, and some have a max (as low as 8 and some up to 14). = = = = = = = = = = = = = = = = = = = = P.E. Metallurgy, Plymouth Tube RE: ferrite testing SJmetallurgist (Mechanical) 27 May 16 11:00 Agree with Metengr with an addition. Ferrite test is done after welding but before any PWHT.