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curated with aloha by
ted_yosem
Ted Mooney, P.E. RET
- Pine Beach, NJ
finishing.com -- The Home Page of the Finishing Industry


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Pickling & Passivating 410S stainless steel per ASTM A380?

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Q. Ferritic stainless steel surface finishing
What kinds of surface finishing are possible on ferritic stainless steel in special SS410S?
We are looking for etching, passivation, electrical polish.

And are there companies in Europe who provide these services on a Hem 100 profile with the length of 2 Mtr

John Beentjes
- Almere, Netherlands
February 23, 2021


A. Hi John. 410S is used for petrochemical refining and things like that because it remains ductile instead of hardening when heated or welded. But apparently this is rather simply achieved by holding the carbon content very low and possibly adding very tiny amounts of titanium or other materials. 4xx stainless is always somewhat more difficult to passivate than 3XX, but I see no obvious reason 410S can't be conventionally etched and passivated; and since electropolished 410S can be purchased, that obviously is a do-able process.

As for Hem profiles, I didn't know what they were, but found this excerpt from incafe2000.com ...

"THE EXTERIOR AND INTERIOR FACES OF THE WINGS ARE PARALLELS BETWEEN AND PERPENDICULAR TO THE SOUL, GETTING THEM WITH THAT A CONSTANT THICKNESS AND REINFORCED WITH RESPECT TO THE HEB PROFILES. THE UNIONS BETWEEN THE FACES OF THE SOUL AND THE INTERIOR FACES OF THE WINGS ARE ROUNDED. ALSO, THE SINGING HAS ARTISTS WITH EXTERIORS AND LIVING INTERIORS."

... which cleared it all up :-)

Yes, surely there are surely companies in Europe who provide the service since 410S doesn't seem special from a wet finishing perspective. Sorry we can't post brands & sources except clearly labeled advertisements (huh? why?)

Luck & Regards,

ted_yosem
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


adv.

Hi John,
Please contact Nicola Budelli from BAMA in Turbigo, Italy. They acquired our technologies for passivation, electropolishing of 400 series ss long ago. For such large piece they can do gel etching or partial electropolishing. Their tank size may also incorporate the whole piece too. Nicola will definitely help you.

anna_berkovich
Anna Berkovich
Russamer Lab
supporting advertiser
Pittsburgh, Pennsylvania
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Q. We are pickling passivation of 410S clad material. After cleaning yellow colour and red colour in surfaces -- what is the reason?

SAKTHIVEL MURUGESAN
- Chennai india
September 4, 2024


? Sakthivel,
Please describe the exact process you are using, including all chemicals, rinses, and times involved. Please describe at what point in the sequence the discoloration first appears. Please provide photographs if possible.

Also, you say "clad", does that mean it is another material with a thin sheet of 410 stainless covering it? What is the base material, carbon steel or something else?

ray kremer
Ray Kremer
Stellar Solutions, Inc.
supporting advertiser
McHenry, Illinois
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⇩ Related postings, oldest first ⇩



Q. Can SS410S material be given Acid Pickling & Passivation as per ASTM A380 ? We have Hydrogen environment & H2S sevice in equipment. Equipment is made of Carbon steel with Internal cladding of SS410S. Can these cladded surfaces after fabrication be Acid pickled & Passivated as per ASTM A380 ? if yes, which Acid we should use. If no, Mechanical descaling & Mechanical cleaning will give good result?

ASHISH KOTHARI
Design Engineer - Mumbai, Maharashtra, INDIA
July 15, 2010


A. Ashish,
You can certainly pickle and/or passivate 410SS, though you would have to be absolutely certain that none of the chemistry will be contacting the carbon steel, or else it will start to destroy it. Acid solutions for pickling and passivating are given in A380 and ASTM A967.

Otherwise, mechanical descaling is always a viable alternative to pickling, but for corrosion resistance it's harder to beat a good passivation treatment.

ray kremer
Ray Kremer
Stellar Solutions, Inc.
supporting advertiser
McHenry, Illinois
stellar solutions banner
July 23, 2010




Q. Can we use pickling passivation on ss 410 trays?
While ASTM 380 doesn't recommend use of such paste on ss410, We are facing sweat contamination on trays.
If we can't use pickling passivation, then which method will be more effective to remove surface contamination.
Thanks

Imran Malik
- Jubail, Saudi Arabia
September 7, 2013


A. Yes, It can be successfully picked and passivized. The paste must be alternated to be suitable for 400 series stainless steel.

anna_berkovich
Anna Berkovich
Russamer Lab
supporting advertiser
Pittsburgh, Pennsylvania
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A. Imran,
I'm not sure what you mean. There is nothing in A380 that says anything against pickling or passivating 410 stainless. Can you explain the nature of this sweat contamination a little more? Do you have some kind of scale or discoloration that is against the appearance you want, or is this a rusting issue? What size are the trays, are you able to dip them in a bath for treatment?

ray kremer
Ray Kremer
Stellar Solutions, Inc.
supporting advertiser
McHenry, Illinois
stellar solutions banner




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