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Anonymous Poster

SS 321 vs SS 316L

12/26/2007 8:28 PM

Hi,
Can anyone tell me the advantages and differences of SS 321 over SS 316L.

I am trying to purchase float type level gauges. The company standard is SS 316(L) for all instrumentation. This particular vendor only manfuctures floats in SS 321 so has offered SS 321 instead of SS 316L. According to the vendor, SS 321 is stronger and more resistant to corrosion than SS 316L.

I wanted to know specifically, if SS 321 is better than SS 316L for:
(1) Chlorides resistance
(2) Hydrogen embrittlement

Thank you,
Praveen

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#1

Re: SS 321 vs SS 316L

12/26/2007 10:55 PM

316L is a low carbon SS

321 is similar to 304 with the addition of titanium as a stabilizer. This addition gives it greater inter-granular corrosion resistance.


Here is a link for the product data sheet in .pdf format..........here

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#2

Re: SS 321 vs SS 316L

12/28/2007 12:05 PM

Do you need SS at all-- ?

Do not be stuck with co. specs.

MayBe material whose level you are floating-is non-corrosive

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#3

Re: SS 321 vs SS 316L

12/28/2007 3:31 PM

321 Stainless Steel

A Chromium (17-20%), Nickel (9-13%), Iron Alloy modified with the addition of titanium to prevent carbide precipitation and resulting intergranular corrosion that can take place in certain mediums when operating in the 800-1200°F (427-649°C) temperature range.

316 Stainless Steel

A Chromium (16-18%), Nickel (11-14%), Iron Alloy with Molybdenum (2-3%) added to improve corrosion resistance in certain environments, especially those which would tend to cause pitting due to the presence of chlorides. Applications include deionized water.

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#4

Re: SS 321 vs SS 316L

01/02/2008 4:40 AM

What about plastics for the wetted parts instead, and add them to the company standards?

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#5

Re: SS 321 vs SS 316L

01/08/2008 12:09 PM

The molybdenum gives 316 better overall corrosion resistant properties than Grade 321 (similar to 304, with Ti addition to improve temperature property within 800-1500 deg F), particularly higher resistance to pitting and crevice corrosion in chloride environments. So if you are really concerning chloride corrosion, then 316 is better choice. There is no difference in hydrogen embrittlement between 304, 316, or 321. All the austentitic stainless steels have exceptional resistance to hydrogen embrittlement in annealed condition.

Hope this helps.

Daniel Qian, P.Eng

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Anonymous Poster
#6

Re: SS 321 vs SS 316L

01/16/2008 8:58 PM

Is SS 316L an controller or electrodes

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Anonymous Poster
#7
In reply to #6

Re: SS 321 vs SS 316L

12/18/2008 9:17 PM

Is SS 316L an controller or electrodes

316 is the grade of SS, L is the acrynim for Low carbon.

If you ask the a he would tell you this is the grade of Stainless Sheet/Plate and also for the filler rod.

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Anonymous Poster
#8

Re: SS 321 vs SS 316L

02/23/2011 12:26 AM

Hi same question:

SS321 flex hose vs. 316 ss flex hose.

is the 321 more resistant to faituge?

Thanks

Mark

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