316 SST vs 316L SST; Corrosion Resistance
316 SST vs 316L SST; Corrosion Resistance
(OP)
We are seeing specifications requiring 316L SST for machined parts in valves, etc., to be used in some corrosive services. We have, in the past, generally utilized only 316SST. There is no welding required for such parts. My questions addresses the difference in corrosion resistance between 316 and 316L.
I would appreciate a quick lesson on these two versions of stainless steel.
I would appreciate a quick lesson on these two versions of stainless steel.





RE: 316 SST vs 316L SST; Corrosion Resistance
Petrotrim Services
RE: 316 SST vs 316L SST; Corrosion Resistance
RE: 316 SST vs 316L SST; Corrosion Resistance
For both alloys carrying out solution heat treatment increases corrosion resistant considerably.
RE: 316 SST vs 316L SST; Corrosion Resistance
The fluids we handle the most are lean amines (45%amine, 55% water), rich amines, containing H2S and CO2. I would assume that our clients are considering 316L to be better for this service. We also handle hydrocarbon gases also having H2S and CO2.
Further comments would be welcome.
RE: 316 SST vs 316L SST; Corrosion Resistance
That said, if you are getting metal that originates in the US, Canada, Japan, or northern Europe then virtually everything will be 316L. In order to get higher carbon you would need to order 316H.
However for metal melted elsewhere it might be a different story.
There should be no price premium for 316L.
And there is safety in using it.
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Plymouth Tube
RE: 316 SST vs 316L SST; Corrosion Resistance
All our valves in Nitric/Organic service are 304L for this very reason. In the secondary processes where we have to switch to 316 SS we also use 316L for repair purposes.
RE: 316 SST vs 316L SST; Corrosion Resistance
L grades are now more available and often lower cost.
RE: 316 SST vs 316L SST; Corrosion Resistance
RE: 316 SST vs 316L SST; Corrosion Resistance