Passivate 316 stainless

[Karl_T]

need to make a weldament out of 316.

found I should use 316L:

What’s the Difference Between 316 and 316L Stainless Steel? - Alliant Metals Inc.

There are quite a few varieties of stainless steel available for your production needs. If you’re new to selecting steels, then it might be confusing to tell the difference between them. We’ll take a look at two similar stainless steels, 316 and 316L, and explain the difference, so you know what...

alliantmetals.com

Plan to TIG it. any other special weld instructions?

Need to passivate also, never done this or anything like it. read this:
https://www.carpentertechnology.com/blog/how-to-passivate-stainless-steel-parts

This table is the meat of the discussion. No such thing as easy to buy nitric any more.




Found this on Amazon:

https://www.amazon.com/Milliard-Citric-Acid-Pound-VERIFIED/dp/B00EYFKNL8

So, is 10% just this offer above 10% in water???

Need to heat to 150, can I just do this on an old stove in a restaurant food grade SS pan?

Other things I need to know??

 

[Cobaltcutter]

We used to do it in a chemical plant I worked at for all the stainless steel pipe welds. Look up Pickling Paste. That is what we used, you paint it on, let it sit and apply a neutralizer and wash it off. I'm sorry but I don't recall the brand. Good luck

 

[Karl_T]

this? looks WAY easier

https://www.amazon.com/KROHN-INDUSTRIES-IN-Pickling-Compound/dp/B01G2KL852/ref=asc_df_B01G2KL852/?tag=hyprod-20&linkCode=df0&hvadid=495969786395&hvpos=&hvnetw=g&hvrand=1141978647531914873&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9011880&hvtargid=pla-791527506360&psc=1&mcid=0bf05c3c7beb399a9cea8f9a3d2286b9&gclid=CjwKCAiApuCrBhAuEiwA8VJ6JiZS-u2LBWJzZMwgrn1i4HC1zItASDIp0SOLqeL0TsgLc2j0887nrhoCGRoQAvD_BwE

or maybe this??

CitriSurf 2210 Gel - Gallon

Formulated for the cleaning and passivation of stainless steel products. In stock and ready to ship.

www.theruststore.com

 

[davidpbest]

316L has lead in it as an anti-rust component. Used extensively in the marine industry for fittings that are routinely/continuously exposed to salt water. I'm sure it has other application, but everything on my sailboat that is ferrous material is 316L.

 

[ddickey]

I thought the L meant low, as in low carbon.

 

[Karl_T]

BTW, I got a BRAND NEW BOAT, first new boat ever in my 70 years. Milady says its my Xmas and birthday present for the next ten years.

these will be tie down brackets to hold the boat on the lift during any future 'cane.

 

[davidpbest]

BTW, I got a BRAND NEW BOAT, first new boat ever in my 70 years. Milady says its my Xmas and birthday present for the next ten years.

these will be tie down brackets to hold the boat on the lift during any future 'cane.

Details on your boat please.
I'm a Passport and Hinckley SW42 owner. Sister ship:

 

[Karl_T]

Pic from my living room this morning...

 

[rabler]

Pic from my living room this morning...

Having spent a decade of my life in Duluth, I'm doubtful that was taken in Minnesota

 

[Karl_T]

Sno bird here. MN by summer; Cudjoe key, 20 miles from Key West, by winter.