By -
Date 09-05-2005 12:59
4g/m2 is a rather easy pitting test to control. It is a standard requirement for Duplex stainless steels in a lot of specifications. In the case of SAW and SMAW, I can most assuredly believe the weight loss is attributed to the fluxing from the electrodes or the flux shielding from the SAW. You must clean each pass very carefully when using these processes. Most of the time, very lightly grinding is recommended. If you consider using 99.99% nitrogen as a purge, you will very likely have a low, or even unacceptably low ferrite count. Nitrogen lowers the ferrite count significantly because nitrogen is a strong austenite former.
Chuck