CD3MN weld ferrite
CD3MN weld ferrite
(OP)
I am having difficulty achieving a ferrite above the 35% minimum as required in NACE MRO 103. I am using E2209-16 rod and solution annealing the weld at 2150°F. The last test I did had a ferrite of 35% in the cap but only 30% in the midweld. I am restricting the interpass temperature to 300°F do I need to restrict it further?
Any help would be appreciated.
Bob
Any help would be appreciated.
Bob





RE: CD3MN weld ferrite
RE: CD3MN weld ferrite
http://www.osti.gov/bridge/servlets/purl/861366-PD9mIS/861366.pdf
RE: CD3MN weld ferrite
Something else that may be helpful is to order electrodes with a FN of 55 or higher (WRC-92 Extended). Keep your interpass temps down as previously suggested and your heat input below 50kJ per inch.
You will do well if you fall between 35 and 40% by manual point count(ASTM E562) which is usually the requirement.
Good Luck
Jeff
RE: CD3MN weld ferrite
2209 is formulated with significantly higher nickel - 9% vs. 5% - to compensate for the fast cooling rate. When you solution anneal you are starting over and cannot expect the weld and base metals to have comparable ferrite levels.
Metengr, no time to plough through the report but I am surprised it would be commercially possible. But I will accept your word on it, since you've been correct once or twice before
RE: CD3MN weld ferrite
RE: CD3MN weld ferrite
RE: CD3MN weld ferrite
Ni is a austenite stabilizer so... lower Ni rod would help.