Ferrite content and ASTM A262-A Corrosion Test
Ferrite content and ASTM A262-A Corrosion Test
(OP)
I have a simple question concerning Ferrite content and ASTM A262-A corrosion test for 316L stainless steel.
Our weld mock was given an ASTM A262-A corrosion test. The results indicated interdendritic ditch structure in the weld metal.
The weld metal also has a ferrite content of >12 <15%. The MTR indicates a ferrite content of 8%. Is the ditch structure caused by the ferrite content being greater than 10%? What can be done to reduce the ferrite content of the weld, and what should be considered for removing the ditch structure from the corrosion test.
Our weld mock was given an ASTM A262-A corrosion test. The results indicated interdendritic ditch structure in the weld metal.
The weld metal also has a ferrite content of >12 <15%. The MTR indicates a ferrite content of 8%. Is the ditch structure caused by the ferrite content being greater than 10%? What can be done to reduce the ferrite content of the weld, and what should be considered for removing the ditch structure from the corrosion test.





RE: Ferrite content and ASTM A262-A Corrosion Test
RE: Ferrite content and ASTM A262-A Corrosion Test
If you anneal at 1200C for 15 minutes, you can restore corrosion resistance. It comes from redustributing chromium where it has been depleted.
RE: Ferrite content and ASTM A262-A Corrosion Test
Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
email: sayee_prasad@yahoo.com
The black holes of nature are the most perfect macroscopic objects there are in the universe: the only elements in their construction are our concepts of space and time.
RE: Ferrite content and ASTM A262-A Corrosion Test
RE: Ferrite content and ASTM A262-A Corrosion Test
RE: Ferrite content and ASTM A262-A Corrosion Test
What is the thermal history of the base metal and to what standard?
What is the filler metal?
How are you measuring the ferrite?
Putting too much heat into the weld can aggravate your problem with ferrite. Chemistry also plays a large role as mentioned. Try a different welding rod/wire and see if you can get an as deposited analysis.
RE: Ferrite content and ASTM A262-A Corrosion Test