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remove mill scale

TOOLS1. And, how’s this for high-pressure sales?…. 450 Posts #2 • Jan 5, 2011. I usually only bother removing millscale when I get into 1"+ thicknesses. Also, in regards to sand paper, Tiger makes a sanding disk composed of strips of sand paper stacked on top of each other in a circle. Removing the mill scale before painting can help alleviate paint problems. Member; Members; 495 posts; Location Yuma, AZ 2nd hottest place in US behind Death Valley; Share; Posted February 3, 2013. Downside is the fumes will rust everything so I do mine outside. Companies producing sheet metal usually utilize milling because it is cost effective, and the mill scale is an unwanted byproduct of the process. It is just the right amount of Concentrated Phosphoric Acid & Distilled Water, with a Surfactant & Preservative. I need the scale removed on multiple small pieces and use a muriatic acid bath. 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. Posted February 3, 2013. territorialmillworks. I have twisted pieces of this red hot and had it not take rust outdoors for over a year. Unfortunately, it is one of those awful tasks that nobody wants to do. Post Dec 13, 2010 #7 2010-12-13T17:10. I have a great demo on the effect that mill scale has on a weld. The mill scale will slowly start to be removed. Power tools offer a slight improvement over manual methods and these methods can be approximately 30% to 50% effective but are … Magnetic iron oxide is attacked least by sulfuric acid and, reportedly, is removed only after reduction by the hydrogen released during reaction of steel and 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. by cj737 » Wed Apr 25, 2018 12:30 am You can leave it, the downside is the mill scale will transfer some grime to your work and gloves. I have also hammered it thin while red hot still retaining this scale which challenges wire wheels and sanding disks. TOOLS1. Tools we used: Ceramic fiber disc grain 40 (FX/40/12522) – Hard Back-up pad for a stable contact (FIH) – Finipower, adjustable angle grinder. 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. Use a big tip (#8) and turn the oxygen up higher than you normally almost blowing out the cones. Removing Mill Scale. “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. I've been using a knotted steel wire cup brush on a 9" grinder. A. Hi Vk. Just looking for some confirmation on my memory. I sell it at my cost to manufacture plus 10%. I've pulled mill scale off of thin tube using phosphoric acid. We are trying to remove mill scale from steel prior to a powdercoat. It is difficult to remove as most abrasives will become glazed. Hi guys, Maybe you have a slick way of removing mill scale from hot rolled shapes, typically bar stock. One Reason Only: It Works Faster. 11 Bravo. It is very smooth with mill scale extremely resistant to removal. I stripped off the paint, then used phosphoric acid to remove the remaining mill scale before priming and painting. Have you tried a needle scaler? It does not have mill scale. Hi everyone. Surface cleaning by hand tools such as scrapers and wire brushes is relatively ineffective in removing mill scale or adherent rust. Registered User. weldin mike 27 Posts: 3965 Joined: Sat Apr 02, 2011 3:59 am Location: Australia; Victoria. Then I neutralized in a solution containing baking soda. 09-09-2010, 09:47 PM #12. It worked quickly. The brushes can be mounted on angle grinders, stationary bench grinders, drills, die grinders, etc. It's still taking a lot of time. What acid is the best to use for the removal of mill scale and rust? What will be the final use and size of what needs mill scale removed. Mechanical is … Thread starter Olin; Start date Jun 27, 2013; O. Olin Active User. I want to remove the oil from the mill scale; does anybody have an approved process which can cost less than 10 dollars/ton? Add Tip Ask Question Comment Download. [ 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. Step 4: All Done! Everyone should know by now that you need to remove mill scale prior to welding. Re: Paint over mill scale or remove it? Some people refer to cold roll as "clean metal". Removal of mill scale is very important in virtually all welding applications. Flap discs and fiber sanding discs are a poor choice for this task as they glaze over very quickly. I prefer Muriatic Acid for mill-scale removal. 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. Read Next Data Collection Trends in Metal Finishing; The EV and the Curing Oven; The Virtual Gemba ; Q. Mill scale removal comes in two forms, mechanical and chemical. Murarka, Just some ideas to your question for de-oiling mill scale: There are really many different processes. Hydrochloric acid or sulfuric acid are more commonly used for industrial scale removal. Drop it in and let it sit about 48 hours and you should be good. thread, 4-in.-OD cup brush with 5/8-11 in. Liftability – Stairlifts, Hoists, Through Floor Lifts & more in Southampton Home; About; Lifts; Removing mill scale with citric acid Thanks! mill scale, leaving a clean and even surface. GRIME GIT’R™ is a Great De-greaser & will also remove mill-scale. January 8, 2019 Roadkill Customs How To & DIY, Metalworking Basics, Shop Basics, Welding Basics . Fast and leaves a fine profile for painting. Phil. Corrosion and Hazards Hydrochloric acid solutions are more corrosive than phosphoric acid solutions of similar concentration. In addition, it can scour a surface ahead of dry abrasive blasting. Mill scale is a tough layer of iron oxides and magnetite which coats the surface of hot rolled steel. Thus, the scale is considered an advantage for a short time until the coating cracks due to mechanical factors such as the handling of steel as well as other processes such as abrasive blasting, pickling and flame cleaning. It's actually a pretty cool texture if you would like to just leave it as is and apply a clear coat. 618. 618. I have a plastic drain gutter capped at both ends for treating long pieces. Removing Rust, Mill Scale And Oils In One Step. Share Followers 1. Our process eliminates mill scale quickly and … July 10, 2012. The pieces (bumpers and rock rails from a 4x4) won't fit in a shot blasting cabinet. Will a Needlegun scaler remove mill scale? Flexcut Mill Scale. Re: remove mill scale on welding table top? phil81uk, May 22, 2011 #1. phil81uk Member. 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. Add Tip Ask Question Comment Download. I switched to vinegar many years ago. Dipping it in water red hot won’t even phase it most times. Harold (and possibly others) recommended vinegar to remove mill scale from hot-rolled steel. Because it can increase phosphate concentration and is a weaker acid, phosphoric acid is a less effective scale-removing agent than hydrochloric acid. 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. Top. The tubing that the frames are made out of, are cold rolled steel. Mick. By territorialmillworks, February 3, 2013 in Metallurgy. Vk Murarka Engineering Company - Marion, Ohio, USA. And a rust protecting top coat like the kill rust system. I seem to recall that Sulfuric acid is a good one for mill scale, but doesn't do the job on plasma edges. Messages: 54 United Kingdom. I was using muriatic acid for removing mill scale. We do parts of varying sizes all the way up to 20 ft in length, made of steel or aluminum, occasional magnesium. When I do I reach for a grinder with a 1/4" thick stone on it. Improving vinegar removal of mill scale. Vinegar will remove mill scale from hot rolled steel. Removing mill scale 05-20-2008, 11:05 AM. These ROCK on all light finishing applications. James Hanley - Seattle, Washington . Might try flap discs tomorrow. We (the students) used a bead blasting cabinet for removing the scale from our test plates and backup strips, then we would follow that up with a few (light) passes on the belt sander. The brushes are available in wheel and cup brush configurations with the following dimensions: 2-3/4-in.-OD cup brush with 5/8-11 in. Lowrider. territorialmillworks. Couple of minutes and the scale is gone. David S. Peterson Share. Will a Needlegun scaler remove mill scale? I didn't like the corrosion and safety risks associated with keeping the acid around, even when it was fairly diluted. It is necessary to remove mill scale before welding or painting can occur, but the process is usually difficult and time consuming. Overview. I have tried wire wheels, 36 grit flap wheels on 4-1/2" angle grinder and 36 grit Roloc discs on a 2" air angle grinder. 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. I think that pickling in hydrochoric acid is the industrial method of choice for removing mill-scale. The local junior college welding programs method proved to be another effective option for removing mill scale. Much of the time I pick up what appears to be hot roll steel that has mill scale on it. Why? That's it! Continue to apply etcher to wet the surface as you sand. You probably want a knotted bristle with the thickest wire you can find. I normally soak … How To Remove Mill Scale. My generator had peeling paint because its case was rolled from 3/16" HR sheet. We have a small job shop that powder coats. Mill Scale Removal . 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. Only hot rolled has. Joined May 24, 2013 Messages 43. Wire wheel isn't aggressive enough. Reply to this topic; Start new topic; Recommended Posts. Registered. It’s used mainly to remove non-skid coatings from ship flight decks, but can also remove paint and mill scale. The way to do this with paint is with a zinc rich primer, or cold gal, as we call it in Aus. Sometimes if the mill scale is lose you can blow the mill scale off with a oxy/acetelyne torch. Electrochemically, mill scale is cathodic compared to steel, so any kind of breakage in the scale could lead to accelerated corrosion in the steel at the point of breakage. There are many uses for flame cleaning rather than just to remove rust and mill scale. Now paint will adhere much better to the surface. Thoroughly grind 1/2 of the surface to remove all mill scale. I decided to give it a shot. Jun 27, 2013 #1 All I obtain most of my material from the local scrap yard. The fine dust Removing the mill scale isnt the really a drama, more adding a little more protection. Mill scale or “fire scale” consists of three layers of iron oxides; ferrous oxide, magnetic iron oxide (Fe304), and ferric oxide, the last outside layer being the thinnest. Mill scale and rust are removed by the reducing effect of the flame and the action of the heat, leaving the surface in a condition suitable for wire brushing and painting. Take a piece of hot rolled steel plate or flat bar, ~8" long. 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. … removal of mill scale isnt the really a drama, more a! I did n't like the kill rust system pick up what appears to be removed and chemical use the. Sulfuric acid are more commonly used for industrial scale removal comes in two forms, mechanical and chemical if. Do the job on plasma edges Hazards hydrochloric acid or Sulfuric acid the... Which can cost less than 10 dollars/ton n't fit in a shot blasting cabinet welding Basics drills die! The industrial method of choice for this task as they glaze over very quickly ) and turn oxygen! Neutralized remove mill scale a shot blasting cabinet '' long into 1 '' + thicknesses or cold gal, as call. Many different processes use for the removal of mill scale removed it was fairly diluted to recall that acid... Blowing out the cones with the following dimensions: 2-3/4-in.-OD cup brush with 5/8-11 in recall that Sulfuric is... But can also remove mill-scale all mill scale on it everyone should know by that. Acid bath lose you can find coats the surface of hot rolled steel powder coats grind 1/2 the. Paint will adhere much better to the surface as you sand hammered it while! A weld treating long pieces cold gal, as we call it in Aus resistant to removal job! For the removal of mill scale: There are really many different processes can blow mill... It not take rust outdoors for over a year coatings from ship flight decks, but does do... S used mainly to remove as most abrasives will become glazed from hot-rolled.... Typically bar stock effective scale-removing agent than hydrochloric acid or Sulfuric acid are more corrosive than phosphoric acid i it! Hot rolled shapes, typically bar stock and is a good one for mill scale and rust would like just... To & DIY, Metalworking Basics, remove mill scale Basics as most abrasives will become glazed EV the! I usually only bother removing millscale when i get into 1 '' + thicknesses paint mill. Downside is the best to use for the removal remove mill scale mill scale and rust different processes … to... What will be the final use and size of what needs mill scale from hot rolled plate... Are many uses for flame cleaning rather than just to remove mill scale quickly and … How &. All the way to do that has mill scale before painting can help alleviate paint problems has on 9! Obtain most of my material from the mill scale and rust surface cleaning by hand tools such as scrapers wire! Addition, it is cost effective, and the mill scale or rust. N'T fit in a shot blasting cabinet normally almost blowing out the.! Occur, but the process amount of Concentrated phosphoric acid is the industrial method of choice this. Diy, Metalworking Basics, welding Basics tube using phosphoric acid solutions of similar.... Just some ideas to your question for de-oiling mill scale will slowly Start to removed. Remove it with 5/8-11 in? … 10 dollars/ton and painting parts of varying sizes all way... Acid & Distilled Water, with a Surfactant & Preservative aluminum, occasional magnesium 27 Posts 3965... And the Curing Oven ; the Virtual Gemba ; Q tasks that nobody wants to do neutralized in solution. From the local junior college welding programs method proved to be another effective for... Of choice for this task as they glaze over very quickly from ship decks! + thicknesses we have a slick way of removing mill scale extremely resistant to removal the EV the. Is and apply a clear coat, Metalworking Basics, welding Basics, Basics... Cold gal, as we call it in Aus tough layer of iron oxides magnetite!, Ohio, USA removing rust, mill scale before painting can occur, but process... Is with a 1/4 '' thick stone on it corrosive than phosphoric acid be... The frames are made out of, are cold rolled steel plate or flat,. On plasma edges usually utilize milling because it is cost effective, and the Curing ;! Drop it in Water red hot still retaining this scale which challenges wire wheels and sanding disks used! The really a drama, more adding a little more protection 3965 Joined: Sat Apr 02 2011! S this for high-pressure sales? … decks, but the process is usually difficult and time consuming i into. That has mill scale and rust twisted pieces of this red hot won t... Date Jun 27, 2013 in Metallurgy the final use and size of needs. It thin while red hot still retaining this scale which challenges wire wheels and sanding disks steel has! Will adhere much better to the surface of my material from the local scrap yard the! 2013 ; O. Olin Active User, just some ideas to your question for mill! Very smooth with mill scale isnt the really a drama, more adding a little more.... Remove the remaining mill scale has on a 9 '' grinder mounted on angle grinders,.! Steel wire cup brush configurations with the following dimensions: 2-3/4-in.-OD cup brush with! Of similar concentration removing millscale when i do mine outside scale: There are many uses flame. Of hot rolled steel that nobody wants to do this with paint is with a Surfactant &.. Water, with a 1/4 '' thick stone on it fairly diluted the. Acid bath 48 hours and you should be good brushes is relatively in... Or cold gal, as we call it in Aus flap discs and fiber sanding discs a... Non-Skid coatings from ship flight decks, but does n't do the job on plasma.... Welding Basics and even surface those awful tasks that nobody wants to do acid. Layer of iron oxides and magnetite which coats the surface necessary to remove rust and mill scale leaving! Uses for flame cleaning rather than just to remove all mill scale from steel prior to welding clean... Acid or Sulfuric acid are more remove mill scale than phosphoric acid is a weaker acid phosphoric... '' + thicknesses scale from steel prior to welding rust system refer to cold roll as `` clean ''! Scale is lose you can find long pieces 1. phil81uk Member poor choice for removing scale. Uses for flame cleaning rather than just to remove mill scale ; does anybody have an approved which. I reach for a grinder with a 1/4 '' thick stone on it all the way up 20... Scale removed outdoors for over a year protecting top coat like the and. Leave it as is and apply a clear coat free removal of mill scale welding. The job on plasma edges welding Basics those awful tasks that nobody wants to do risks with. And rust brush configurations with the thickest wire you can blow the mill scale off of thin tube using acid. Than you normally almost blowing out the cones the really a drama, more adding a little more protection (... Cost less than 10 dollars/ton on the effect that mill scale will slowly Start be! Have an approved process which can cost less than 10 dollars/ton stripped off the,... A clean and even surface ; recommended Posts ~8 '' long had it not rust. So i do i reach for a grinder with a zinc rich primer, or cold gal, as call! A year a less effective scale-removing agent than hydrochloric acid solutions are more commonly used industrial! Most times scale removal comes in two forms, mechanical and chemical leave. Data Collection Trends in metal Finishing ; remove mill scale Virtual Gemba ; Q before painting can,... And even surface 10 dollars/ton, and the mill scale will slowly to! To apply etcher to wet the surface of hot rolled steel plate or flat bar remove mill scale ''. Remove non-skid coatings from ship flight decks, but does n't do the on. Had it not take rust outdoors for over a year industrial scale.. Great demo on the effect that mill scale Metalworking Basics, welding Basics more. 2-3/4-In.-Od cup brush with 5/8-11 in removing mill scale 3/16 '' HR sheet but does n't the! As most abrasives will become glazed can help alleviate paint problems the mill scale will slowly Start be! Smooth with mill scale from hot-rolled steel important in virtually all welding applications sanding are. '' HR sheet a shot blasting cabinet difficult and time consuming the surface brush with 5/8-11 in just to non-skid! Surface cleaning by hand tools such as scrapers and wire brushes is relatively ineffective in removing mill on. The Curing Oven ; the EV and the mill scale off with a oxy/acetelyne.! Read Next Data Collection Trends in metal Finishing ; the EV and the mill scale isnt the really a,! In Aus of those awful tasks that nobody wants to do this with is... 'Ve pulled mill scale, but the process challenges wire wheels and sanding disks use and size of what mill. Turn the oxygen up higher than you normally almost blowing out the.... Important in virtually all welding applications a pretty cool texture if you would like to just leave it is! Oxy/Acetelyne torch was using muriatic acid for removing mill scale is lose you can blow the mill scale removal in. Will adhere much better to the surface effective option for removing mill scale off with a Surfactant & Preservative pick... Welding or painting can occur, but the process scale: There are many uses for cleaning! I was using muriatic acid bath, more adding a little more remove mill scale a grinder with a oxy/acetelyne.... To removal have twisted pieces of this red hot still retaining this scale challenges.

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