- Thread starter Lemo
- Start date
- Messages
- 13,544
- Location
- England
I guess its one of those questions... 316ti-316ti youd be looking at a 318 filler believe...
But as its going onto 304, i'd imagine 316 would be adequate.
@TechnicAl is the Oracle when it comes to these kind of things though....
But as its going onto 304, i'd imagine 316 would be adequate.
@TechnicAl is the Oracle when it comes to these kind of things though....
Cheers guys, much appreciated.
@TechnicAl. I've always been led to believe you match the highest grade of stainless... Until today. Am I right in thinking It's recommended to use 308L to reduce sensitization?
@TechnicAl. I've always been led to believe you match the highest grade of stainless... Until today. Am I right in thinking It's recommended to use 308L to reduce sensitization?
You only need to match the lowest....theres no point in overmatching as the lowest grade will fail first. There can be some very specific applications where only the higher grade and the weld are in contact with the corrosive atmosphere but in general matching the lowest usually gives the best results.....Yes, using the L grades should eliminate any sensitisation effect......its the Carbon that combines with the Chromium and effectively depletes the Chromium content that is available to oxidise and provide the self repairing qualities.......no carbon, no depletion
Ah. I always assumed you matched the highest to prevent washing out, in the same way 309 is over alloyed. So because the chromium combines with the carbon there is none free to create the oxide that makes it stainless? In my case the Ti is sacrificial by combining with the carbon, freeing the chromium to create the chromium oxide layer?
Thats correct.........309L is roughly 23Cr 12Ni so when diluted by mild steel it ends up 18 / 8 same as 304L/308L or if its diluted by 18/8 it doesnt really alter much......and contrary to popular belief 309MoL is not a super 309L ....its designed to overlay on mild steel and give a 316L grade layer.
Dont know why.....Ti doesnt pass across an arc with any consistency......Thats why the stabilised types use Nb (347 and 318)
Brad93
Member
- Messages
- 19,090
- Location
- Essex, United Kingdom
Yeah I think it was 318. For use on 316Ti.
