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23rd Aug 2021, 07:49 PM #1
Polished Mild steel looks Blotchy
Ive recently folded a piece of Mild Steel up to become a Hand Saw back, I知 now wanting to polish it up to a high lustre(mirror Finnish) if I can,its only 19 mm wide by about 160 mm long,so not a huge endeavour an I知 only hand sanding it,tho I did skim over it using a Little Velcro pad on a Dremel with some 120 grit Initially.
Then whent back to 80 grit wet and dry working up too 2000 grit.
I will when I get the chance use some polishing wheels but I知 currently in lockdown in Melbourne,an my polishing equipment is in Ballarat.
I can almost get the shine I want but I keep getting this kind of weird effect showing up on the metal its not previous grit scratch marks,tho in the pics there are some,its more like a stain in the metal its self, its across the whole back,I知 on attempted number two,an looks like I be going for a third attempt.
I知 confident I知 not going too the next grit to early,tho maybe not.
I think you can see were my problem is in the last picture,but I apologise I知 crap with a camera.
Cheers Matt.
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23rd Aug 2021, 07:59 PM #2Philomath in training
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Steel does have a grain - it may be that you getting some of that coming through from the original hot rolling (bit like damascus steel but not as uniform)
Michael
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23rd Aug 2021, 08:10 PM #3
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23rd Aug 2021, 08:21 PM #4Most Valued Member
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Reminds me of a saying. No matter how much you polish a .... it will still be a ....
Try bead blasting for a satin finish and clear coat. Why does it need to be shiny?Nev.
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23rd Aug 2021, 08:24 PM #5Gear expert in training
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I can bead blast at work if you want, assuming we're ever let out of lockdown...
Gear cutting specialists and general engineers www.hardmanbros.com.au
Fine pitch gear cutting from 0.1 Module www.rigear.com.au
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23rd Aug 2021, 08:34 PM #6
Polished Mild steel looks Blotchy
Thanks for the offers on the Bead Blasting an that is a nice look,but I was wanting a bit of Spit an polish on this one.
Cheers Matt.
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23rd Aug 2021, 08:36 PM #7Gear expert in training
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Chrome or nickel plating will do that
Gear cutting specialists and general engineers www.hardmanbros.com.au
Fine pitch gear cutting from 0.1 Module www.rigear.com.au
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23rd Aug 2021, 08:45 PM #8
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23rd Aug 2021, 08:49 PM #9Gear expert in training
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A lot of common silver polishes remove tarnish by chemical reaction, not abrasion, so it likely wouldn't have done anything anyway.
Gear cutting specialists and general engineers www.hardmanbros.com.au
Fine pitch gear cutting from 0.1 Module www.rigear.com.au
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24th Aug 2021, 05:14 PM #10Senior Member
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Polishing steel.
Hello Matt.
You will be able to raise a good gloss on that job with a sisal mop and medium Greasy polishing compound. Just be careful with the mop as they draw a bit of power and can burn out your drill/grinder.
Regards
BC
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24th Aug 2021, 07:56 PM #11
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24th Aug 2021, 09:52 PM #12Most Valued Member
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Is this sheet steel or hot rolled bar?
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24th Aug 2021, 10:48 PM #13
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24th Aug 2021, 11:19 PM #14Most Valued Member
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Thought it might be. I vaguely recall coming across this before but cant remember the details(great help hey?)
It may not go that deep, you maybe able grind it out, know anyone with a belt grinder(or is that in Ballarat also)?
If the length isn't that critical you could try reworking the last 10mm and if it doesn't improve just cut that piece off.
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25th Aug 2021, 06:42 PM #15
I got over sanding my finger prints off,
still more work to do,the top front of the saw plate(Bull noose)is getting a trim,it looks clunky.
Cheers Matt.
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