SS 316 Vs 316L
SS 316 Vs 316L
(OP)
Dear all,
What is the basic difference between SS 316 and 316L interms of their resistance against corrosion in seawater service.
regards
What is the basic difference between SS 316 and 316L interms of their resistance against corrosion in seawater service.
regards





RE: SS 316 Vs 316L
How hot does it get?
Seems to me that the L grade would have better consistancy part to part since the carbon content is better controlled. However much of the 316 I've seen is dual certed for 316/316L.
RE: SS 316 Vs 316L
The Corrosion resistance of SS 316/316L in seawater, mostly pitting/crevice corrosion, is due to the presence of Mo in concentration between 2-3%. The L means that the carbon is below 0.03% and this make difference when you have to weld it. Lower concentration of C means no problems of sensitization and following intergranular corrosion.
hope this help
regards
Strider
http://www.corrosionist.com
RE: SS 316 Vs 316L
The real difference between the grades will be if there are any welds. The welds in the straight grade material will have heat affected zones with some grain boundary carbide precipitation and they will be more likely to suffer intergranular corrosion.
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Rust never sleeps
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RE: SS 316 Vs 316L
both are not good for seawater service, maybe SS 316L has a little bit more resistance...
Regards
Luis Marques
RE: SS 316 Vs 316L
I don't think that it's correct to say that a 316L is no good for a seawater service.
I agrre that under certain condition is not the right selection,stagnant conditions, temperature above a certain limit, but under other condition it could be a good choice.
The final selection of a material is not simply is good or is not good, but it will make the work i'm asking for or not, and a lot of parameters have to be considered: criticality of the service, cost, possibility to inspect...
I think this is the correct approach of a corrosion engineer when selecting a material.
regards
Strider
http://www.corrosionist.com
RE: SS 316 Vs 316L
I was answering to a generalise question, but I keep on thinking that the referred materials are not the adequate ones for seawater services.
Please go to
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Cheers
Luismarques
RE: SS 316 Vs 316L
I agree with you that as a general rule 316L could not be the perfect choice, but for certain components, pumps impeller for example, SS 316 can be used.
Seawater service includes so many equipment, components and so on that is not always possible to generalize.
This is my opinion.
regards
Strider
http://www.corrosionist.com
RE: SS 316 Vs 316L
Even boat rails made from 316 need to be washed and cleaned to prevent pitting.
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Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: SS 316 Vs 316L
Thankf ro your feed back, its is clear that low carbon help in getting better protection beacuse of sensitization issues if exposed to elvetated temperature. My question was if there no such issues with carbide precipitation, will there any preference of using 316L over 316?
regards
RE: SS 316 Vs 316L
regards
Strider
http://www.corrosionist.com
RE: SS 316 Vs 316L
" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke
RE: SS 316 Vs 316L
Michael McGuire
http://stainlesssteelforengineers.blogspot.com/