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Satin finishes on stainless steel

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Q. How to obtain a satin finish on a stainless steel kitchen sink? Can it also be done after mirror polishing it?

mohit kumar
- New Delhi - INDIA

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Ed. note: This particular thread is primarily "industry oriented", i.e., it discusses the mechanical and/or chemical ways to apply satin finishes in a factory.

If you are a consumer more concerned with repairing a scratch in a stainless sink, appliance, etc., better starting points might be letter 4148, "Removing scratches from stainless steel appliances" or letter 11404 "Scratches on satin finish stainless steel". We have dozens of threads on such topics if you use the search engine at the top of the page, and you'll probably get the best results if you include the word "scratch" in your search term.


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A. There are a number of ways to get a satin finish on stainless steel. Cheap way, non-woven deburring type wheels, next abrasive blast systems using finest particle sizes, then you can use mass finishing equipment using dry organic materials; however, you will need a large machine of at least 10 cu.ft. capacity, maybe bigger depending upon the size of your part. The method you use really depends on the volume of parts needed to be processed and the type of finish you are looking for.

AF Kenton
Nova Finishing Sytems Inc. - Hatboro, Pennsylvania


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A. True no. 4 satin finish (180 grits) are mass produced using special polishing machines in sheet form.

Michael Liu Taylor
   specialty stainless steel distributor
Dallas, Texas



How to do stainless steel satin finishing with HNO3 / HF chemicals?

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Q. I WANT TO DO SATIN FINISH OR DULL FINISH TO STAINLESS STEEL. I CAME TO KNOW IT CAN BE DONE WITH A MIXING OF NITRIC ACID WITH HF. IS IT POSSIBLE TO DO THAT? IF IT IS -- HOW TO DO THE PROCESS? PLEASE LET ME KNOW.

SRINIVAS SUSARLA
- INDIA


January 8, 2010appended

Q. I have started fabrication of stainless steel architectural hardware and want to know how what is satin finish and how we can achieve it.

Anubhav Gupta
Product designer - New Delhi, Delhi, India


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A. Satin finish is whatever the customer considers satin finish. Commonly, for stainless steel, it is less glossy than a polished surface, with a unidirectional (linear grained) brushed finish having transverse Ra of about 0.5 microns.

See the No. 6 finish per ASTM A480 [link is to spec at TechStreet] in 'Special Finishes for Stainless Steel' from http://www.ssina.com, and the 1K & 2K finishes per EN 10088 Part 2 in 'Guide to Stainless Finishes' from http://www.euro-inox.org

A nitric-hydrofluoric acid solution is used for pickling (to remove heat or welding scale). HCl, HF or heated H2SO4 solutions can produce dull (matte, whitish) finishes. These should afterwards be passivated in an appropriate nitric or heated citric acid solution.

Perhaps best to purchase satin and dull (e.g., No. 2D) finished stainless, and only touch-up marks made in fabricating your product.

Ken Vlach
- Goleta, California  

Ken received a special
"Contributor of the Year" award
from finishing.com for his numerous
helpful and well researched responses


December 4, 2013appended

Q. Is there anybody who can guide me to do satin finish on Type 304 stainless steel? I have tested using hydrofluoric acid 8% with 25% of nitric acid at 40 °C and time given was 30 minutes -- but results are not so satisfactory.

Regards,

Bakhtiar Awan
medical devices - sialkot, punjab, Pakistan


November 2013

A. Hi Bakhtiar. We've appended your question to a thread where it has already been answered by Ken. Please consult his references and get back to us with any specific questions or updates. Thanks.

Regards,

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


Satin finishing in the fab shop

+++++++appended

Q. I am a lead man for a steel fab shop and we have a new stainless steel job coming up that calls for a satin finish on the "A" surface. Being that we rarely work with stainless, and used to farm out the finishing process, any help would be appreciated.

Erwin O. Raymer
fabricator - Berick, Pennsylvania


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A. Use this site's search engine for "satin finish". You will get dozens of hits.
You should notice that there is no positive definition -- So you'd better find out exactly what your customer thinks that it is.

James Watts
- Navarre, Florida


+++++++

A. How big are the parts? Sheet metal? Any shape? Quantity?

AF Kenton
Nova Finishing Sytems Inc. - Hatboro, Pennsylvania



Satin finish on welds on 304 stainless steel sheets

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Q. I am trying to obtain a uniform satin finish on 304 2B stainless steel sheets. I have great results with an orbital sander using 60 grit, but I am having difficulty bringing the welds back to the same finish. I have had mixed results blending the welds with 7" sanding disks (150 grit), then following with scotch brite disks, then back to the orbital sander.
I often find there are still scratches left by the 7" sanding disks.
I would greatly appreciate any advise or opinions on this procedure.

Thank you in advance,

Christopher Gay
design - San Diego, California, USA


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A. Have you considered abrasive blasting the bead only? Unless the weld pattern is completely flat, you are going to have problems and or a lot of manual touch up no matter what belts or wheels you use.

AF Kenton
Nova Finishing Sytems Inc. - Hatboro, Pennsylvania



Obtaining satin finish on stainless railings

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Q. Hi. I have stainless handrail that I am trying to obtain a satin finish on. Can anyone offer any suggestions or ideas on how to achieve this? I have tried sandblasting and hand sanding. I am getting desperate!

Brandi Hurd
hobbyist - Cartersville, Georgia, USA


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A. Hi Brandi. Unfortunately, people have differing visions of what a satin finish is. To some it just means a brushed finish, to others it can mean a translucent "frosted" look.

But most "brushed" finishes (if that's what you want) are actually obtained from scratching with sandpaper (or scotch brite) rather than with a metal brush. If you have a belt sander, try a quick "scritch" with a coarse paper, although it will be very hard to get consistency the length of the rail and around it. The way it's usually done on flat surfaces is with a machine like a "Timesaver" (a brand name) which uses a conveyor belt to convey the work through, and a wide rotating belt of sandpaper (as wide or wider than the work),running in the opposite direction, to to deliver this continuous end-to-end quick "scritch".

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey

+++++++

A. Hi Brandi, sounds like an interesting project. Ted is right. What is the 'satin finish you seek? A brushed grain finish requires abrasive process in long stroke pattern. A sandblasted finish will provide a random, non pattern stain look. You can use a belt sander or inline sander to obtain line pattern yet the more important issue here is the chromium cap which develops on the surface of SS to protect from rusting and corrosion. Your will want to wax this new finish to protect it and allow the chromium to form a seal.

adv.
We have these products if interested.

Barry Feinman
Restore It Yourself, Inc

Carlsbad, California



Satin Finish Lacks Shine

May 2, 2011

Q. We are a manufacturer of Industrial Kitchen equipment and are based in India.

In order to get satin finish, normally found on pre-finished polished stainless steel sheets, we have developed a machine where the rotating shaft also moves to and fro along the axis as well. On this machine we loaded scotch bright wheel (non woven abrasive wheel) and got good result except that it lacks shine.

Can you please suggest any solution to this problem. Our machine has only one shaft.

Chaman Lal Razdan
industrial kitchen equipment manufacturer - Pune, Maharashtra, India

May 5, 2011

A. Hmmmm. You want a satin finish but "it lacks shine". Sounds like a contradiction of wants or needs. Non-woven wheels will produce the satin finish; however, if you apply a lot more pressure you maybe able to get a shine out of them. If not then you may have to do a secondary steel with either a cotton buff or felt with rouge. Then again, you may lose satin finish.

AF Kenton
Nova Finishing Sytems Inc. - Hatboro, Pennsylvania



Satin finish on turned components

January 24, 2013

Q. Hi,

I'd like to know how to get a satin finish on turned stainless steel components, one similar to this please:

satin finish on stainless steel

Any suggestions?

Matt

Matthew Martin
Design Engineer - Chester, Cheshire, UK
  ^- Privately contact this inquirer -^


January 25, 2013

A. Hi Matthew. You could always ask Super T Manufacturing how they do it, but I suppose they would be happy to sell you parts but not reveal their methodology :-)

In my (limited) experience, very fine matte/satin finishes like this on stainless steel are more often obtained by glass bead blasting rather than with sanding/brushing or chemicals. But to get a consistent finish around the turned object, I think you would need to fixture it in a machine which rotates it (and possibly also indexes up and down). Good luck.

Regards,

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey

January 28, 2013

A. As mentioned there are a number of choices and probably the most common is glass bead blasting. If you need a finer finish than 32RMS or you have a lot of volume, you might want to consider a mass finishing system using a dry organic abrasive mix.

AF Kenton
Nova Finishing Sytems Inc. - Hatboro, Pennsylvania


March 19, 2013

A. Hi!
I think you can reach that surface quality with a simple scotch-brite wheel.
You have to prepare the surface with a grinding or a vibratory process and then using the scotch-brite wheel you can find the satin finish quality.

Alvise Carraro
- Padova, ITALY

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