Harold (and possibly others) recommended vinegar to remove mill scale from hot-rolled steel. Much of the time I pick up what appears to be hot roll steel that has mill scale on it. Liftability – Stairlifts, Hoists, Through Floor Lifts & more in Southampton Home; About; Lifts; Removing mill scale with citric acid Everyone should know by now that you need to remove mill scale prior to welding. David S. Peterson Share. Member; Members; 495 posts; Location Yuma, AZ 2nd hottest place in US behind Death Valley; Share; Posted February 3, 2013. The fine dust We have a small job shop that powder coats. And, how’s this for high-pressure sales?…. It’s important to note that although waterjetting can effectively clean a steel surface, it will not create a surface profile or anchor pattern that is essential for good coating adhesion. Then I neutralized in a solution containing baking soda. I want to remove the oil from the mill scale; does anybody have an approved process which can cost less than 10 dollars/ton? I think that pickling in hydrochoric acid is the industrial method of choice for removing mill-scale. Some people refer to cold roll as "clean metal". Mechanical is … [ citation needed ] Although the majority of mill scale is removed during its passage through scale breaker rolls during manufacturing, smaller structurally inconsequential residue can be visible. Posted February 3, 2013. territorialmillworks. Mill scale removal comes in two forms, mechanical and chemical. Mill scale is sought after by select abstract expressionist artists as its effect on steel can cause unpredicted and seemingly random abstract organic visual effects. Mill scale is a very thin layer of brownish to black material that forms when people pass steel through a hot mill to roll and shape it. No more glazing or clogging, just hassle free removal of . Ordinarily, I would use abrasives or electrolysis, but abrasives don't do well with the magnetite in scale (Mohr hardness 5.5+), and electrolysis tends to put magnetite ON things. When I do I reach for a grinder with a 1/4" thick stone on it. The brushes can be mounted on angle grinders, stationary bench grinders, drills, die grinders, etc. It is difficult to remove as most abrasives will become glazed. Read Next Data Collection Trends in Metal Finishing; The EV and the Curing Oven; The Virtual Gemba ; Q. Power tools offer a slight improvement over manual methods and these methods can be approximately 30% to 50% effective but are … Couple of minutes and the scale is gone. Murarka, Just some ideas to your question for de-oiling mill scale: There are really many different processes. TOOLS1. I have a plastic drain gutter capped at both ends for treating long pieces. 618. The tubing that the frames are made out of, are cold rolled steel. Mill scale is a tough layer of iron oxides and magnetite which coats the surface of hot rolled steel. Add Tip Ask Question Comment Download. I've pulled mill scale off of thin tube using phosphoric acid. Take a piece of hot rolled steel plate or flat bar, ~8" long. Flexcut Mill Scale. James Hanley - Seattle, Washington . Have you tried a needle scaler? Mill Scale Removal . Flap discs and fiber sanding discs are a poor choice for this task as they glaze over very quickly. Because it can increase phosphate concentration and is a weaker acid, phosphoric acid is a less effective scale-removing agent than hydrochloric acid. They are suitable for removing localized, heavy mill scale before welding in hard-to-reach areas; heavy-duty surface-conditioning applications; blending machining marks; and generating distinct scratch patterns. Removing mill scale 05-20-2008, 11:05 AM. Powered wire brushes are available in a variety of wire gauges and are strong enough to remove mill scale, depending on how heavy it is. View Profile View Forum Posts Cast Iron Join Date Feb 2008 Country UNITED STATES State/Province Wyoming Posts 447 Post Thanks / Like Likes (Given) 81 Likes (Received) 117. It worked quickly. Will a Needlegun scaler remove mill scale? 618. Might try flap discs tomorrow. It is just the right amount of Concentrated Phosphoric Acid & Distilled Water, with a Surfactant & Preservative. I switched to vinegar many years ago. Why? It does not have mill scale. Hi guys, Maybe you have a slick way of removing mill scale from hot rolled shapes, typically bar stock. I decided to give it a shot. 11 Bravo. The thin layer of iron oxide covering the surface of hot rolled steel plates, sheets or profiles is known in the industry as mill scale or scale. Removing the mill scale of hot rolled steel: grind away the dull grey covering of steel before painting or welding with a ceramic fiber disc. It's actually a pretty cool texture if you would like to just leave it as is and apply a clear coat. That's it! I have a great demo on the effect that mill scale has on a weld. weldin mike 27 Posts: 3965 Joined: Sat Apr 02, 2011 3:59 am Location: Australia; Victoria. I need the scale removed on multiple small pieces and use a muriatic acid bath. One Reason Only: It Works Faster. mill scale, leaving a clean and even surface. phil81uk, May 22, 2011 #1. phil81uk Member. The way to do this with paint is with a zinc rich primer, or cold gal, as we call it in Aus. The local junior college welding programs method proved to be another effective option for removing mill scale. Removing the mill scale before painting can help alleviate paint problems. January 8, 2019 Roadkill Customs How To & DIY, Metalworking Basics, Shop Basics, Welding Basics . thread, 4-in.-OD cup brush with 5/8-11 in. Vk Murarka Engineering Company - Marion, Ohio, USA. I stripped off the paint, then used phosphoric acid to remove the remaining mill scale before priming and painting. I have also hammered it thin while red hot still retaining this scale which challenges wire wheels and sanding disks. Post Dec 13, 2010 #7 2010-12-13T17:10. Joined May 24, 2013 Messages 43. July 10, 2012. Continue to apply etcher to wet the surface as you sand. Removing the mill scale isnt the really a drama, more adding a little more protection. I seem to recall that Sulfuric acid is a good one for mill scale, but doesn't do the job on plasma edges. How To Remove Mill Scale. I prefer Muriatic Acid for mill-scale removal. “By the nature of the definition of the standard, it’s gone through abrasive blasting, would completely remove all old paint, mill scale, and rust, leaving no more than 5 percent of staining—discoloration with no volume.” The surface profile that results depends on the type of abrasive used. Unfortunately, it is one of those awful tasks that nobody wants to do. And a rust protecting top coat like the kill rust system. Downside is the fumes will rust everything so I do mine outside. Share Followers 1. Re: Paint over mill scale or remove it? Hi everyone. We do parts of varying sizes all the way up to 20 ft in length, made of steel or aluminum, occasional magnesium. Messages: 54 United Kingdom. Improving vinegar removal of mill scale. Vinegar will remove mill scale from hot rolled steel. 450 Posts #2 • Jan 5, 2011. You probably want a knotted bristle with the thickest wire you can find. Phil. 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Way of removing mill scale off with a 1/4 '' thick stone on it have twisted pieces of this hot... Approved process which can cost less than 10 dollars/ton 9 '' grinder cleaning than... To your question for de-oiling mill scale around, even when it was fairly diluted with remove mill scale!

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