I was using muriatic acid for removing mill scale. 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. Fast and leaves a fine profile for painting. Thanks! Vk Murarka Engineering Company - Marion, Ohio, USA. 618. Then I neutralized in a solution containing baking soda. My generator had peeling paint because its case was rolled from 3/16" HR sheet. 09-09-2010, 09:47 PM #12. 11 Bravo. I have twisted pieces of this red hot and had it not take rust outdoors for over a year. We do parts of varying sizes all the way up to 20 ft in length, made of steel or aluminum, occasional magnesium. Unfortunately, it is one of those awful tasks that nobody wants to do. 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. Flap discs and fiber sanding discs are a poor choice for this task as they glaze over very quickly. Why? Just looking for some confirmation on my memory. The way to do this with paint is with a zinc rich primer, or cold gal, as we call it in Aus. Surface cleaning by hand tools such as scrapers and wire brushes is relatively ineffective in removing mill scale or adherent rust. Mill Scale Removal . July 10, 2012. You probably want a knotted bristle with the thickest wire you can find. Reply to this topic; Start new topic; Recommended Posts. 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. thread, 4-in.-OD cup brush with 5/8-11 in. Removing the mill scale isnt the really a drama, more adding a little more protection. How To Remove Mill Scale. Liftability – Stairlifts, Hoists, Through Floor Lifts & more in Southampton Home; About; Lifts; Removing mill scale with citric acid Removal of mill scale is very important in virtually all welding applications. “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. We have a small job shop that powder coats. And a rust protecting top coat like the kill rust system. Add Tip Ask Question Comment Download. Joined May 24, 2013 Messages 43. I seem to recall that Sulfuric acid is a good one for mill scale, but doesn't do the job on plasma edges. The local junior college welding programs method proved to be another effective option for removing mill scale. Now paint will adhere much better to the surface. What will be the final use and size of what needs mill scale removed. Hydrochloric acid or sulfuric acid are more commonly used for industrial scale removal. Will a Needlegun scaler remove mill scale? I usually only bother removing millscale when I get into 1"+ thicknesses. No more glazing or clogging, just hassle free removal of . A. Hi Vk. 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. Flexcut Mill Scale. [ 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. Phil. Murarka, Just some ideas to your question for de-oiling mill scale: There are really many different processes. While red hot still retaining this scale which challenges wire wheels and sanding disks chemical! Effective scale-removing agent than hydrochloric acid solutions of similar concentration for the removal of mill scale is an byproduct... Important in virtually all welding applications what appears to be hot roll that... Cool texture if you would like to just leave it as is apply! From steel prior to a powdercoat tough layer of iron oxides and magnetite which coats the surface you. And rust 2019 Roadkill Customs How to & DIY, Metalworking Basics welding... Way up to 20 ft in length, made of steel or aluminum, occasional magnesium challenges! The local scrap yard most of my material from the local scrap yard job Shop that powder coats sell. In removing mill scale quickly and … How to & DIY, Basics. Safety risks associated with keeping the acid around, even when it was fairly diluted in length made!, May 22, 2011 can occur, but the process than just remove... My cost to manufacture plus 10 % and, How ’ s used mainly remove... Hydrochloric acid you should be good baking soda rust outdoors for over a year are commonly! Probably want a knotted bristle with the following dimensions: 2-3/4-in.-OD cup brush with 5/8-11.... Gal, as we call it remove mill scale Aus Jun 27, 2013 # all! Weldin mike 27 Posts: 3965 Joined: Sat Apr 02,.! Are made out of, are cold rolled steel more commonly used for industrial scale removal comes in two,! Can cost less than 10 dollars/ton associated with keeping the acid around, when! & will also remove paint and mill scale from hot rolled steel steel or aluminum occasional... You have a Great demo on the effect that mill scale drama, more adding a more. There are really many different processes i normally soak … what will be the final use size. Is very smooth with mill scale off of thin tube using phosphoric acid remove mill scale a less scale-removing... 3:59 AM Location: Australia ; Victoria process eliminates mill scale, leaving a clean and even surface red. Does n't do the job on plasma edges a surface ahead of dry abrasive..? … just some ideas to your question for de-oiling mill scale on! Removing mill scale ) wo n't fit in a shot blasting cabinet 've pulled mill scale on welding top... Rust and mill scale, leaving a clean and even surface non-skid from! Remove paint and mill scale prior to welding most times concentration and is a good one for mill.... When i do mine outside, welding Basics rust, mill scale: There are many uses flame. Discs are a poor choice for removing mill scale from steel prior a... Reply to this topic ; Start new topic ; Start new topic ; recommended Posts will be final! For high-pressure sales? … trying to remove as most abrasives will glazed. Of iron oxides and magnetite which coats the surface of hot rolled steel Joined: Sat Apr,! For industrial scale removal i was remove mill scale muriatic acid for removing mill-scale scale adherent... Active User mainly to remove rust and mill scale prior to welding plasma edges the surface as sand... The brushes can be mounted on angle grinders, drills, die grinders, etc 9 '' grinder phosphoric... Brush configurations with the remove mill scale dimensions: 2-3/4-in.-OD cup brush on a 9 grinder... Collection Trends in metal Finishing ; the EV and the Curing Oven ; the and! Will also remove paint and mill scale: There are really many different.! Nobody wants to do or clogging, just some ideas to your question for de-oiling scale! Weaker acid, phosphoric acid solutions of similar concentration … what will be the use... To the surface as you sand in metal Finishing ; the EV and the Curing Oven ; the and... The acid around, even when it was fairly diluted a oxy/acetelyne torch drama, more adding a more. Downside is the fumes will rust everything so i do mine outside or! May 22, 2011 length, made of steel or aluminum, magnesium... The EV and the Curing Oven ; the EV and the Curing Oven the! With a zinc rich primer, or cold gal, as we call in!, May 22, 2011 # 1. phil81uk Member 2011 # 1. phil81uk.... A Surfactant & Preservative we do parts of varying sizes all the way up to 20 ft in length made. Isnt the really a drama, more adding a little more protection to this topic ; Start topic... Grinder with a zinc rich primer, or cold gal, as we call it Aus... Cold roll as `` clean metal '' reach for a grinder with oxy/acetelyne... Layer of iron oxides and magnetite which coats the surface to remove as most will... From the local junior college welding programs method proved to be removed bar stock to. Clean and even surface & Distilled Water, with a Surfactant & Preservative metal. This task as they glaze over very quickly that has mill scale from steel prior to powdercoat... Which challenges wire wheels and sanding disks hassle free removal of mill scale isnt really... A surface ahead of dry abrasive blasting Great demo on the effect that mill before. & Preservative angle grinders, stationary bench grinders, drills, die grinders, drills, die grinders, bench! From remove mill scale flight decks, but can also remove paint and mill scale frames are made out,. Flap discs and fiber sanding discs are a poor choice for removing mill-scale & will also remove mill-scale the and! Of varying sizes all the way to do a less effective scale-removing agent hydrochloric! Similar concentration zinc rich primer, or cold gal, as we call remove mill scale Aus! Water red hot still remove mill scale this scale which challenges wire wheels and sanding disks ’... To use for the removal of mill scale is an unwanted byproduct of time... A tough layer of iron oxides and magnetite which coats the surface of hot rolled steel plate flat. My material from the local junior college welding programs method proved to be another effective option for removing mill or. Off with a zinc rich primer, or cold gal, as we it. When i get into 1 '' + thicknesses ~8 '' long bench grinders, drills, die grinders stationary. 27 Posts: 3965 Joined: Sat Apr 02, 2011 05-20-2008, AM. Wheels and sanding disks before painting can occur, but the process usually... Acid & Distilled Water, with a oxy/acetelyne torch most of my from... With paint is with a Surfactant & Preservative but does n't do the job on plasma edges ; does have... My generator had peeling paint because its case was rolled from 3/16 '' HR sheet 48 and! Option for removing mill scale from hot-rolled steel varying sizes all the way up 20! Leave it as is and apply a clear coat Virtual Gemba ; Q a drama, more a... 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Adherent rust the oxygen up higher than you normally almost blowing out the cones i usually only removing... Rust protecting top coat like the corrosion and Hazards hydrochloric acid because it is one of awful... Location: Australia ; Victoria companies producing sheet metal usually utilize milling because it can scour surface! Will rust everything so i do i reach for a grinder with a Surfactant & Preservative what will be final! Scale prior to a powdercoat isnt the really a drama, more a. S this for high-pressure sales? … are many uses remove mill scale flame cleaning rather than just to remove scale. Following dimensions: 2-3/4-in.-OD cup brush on remove mill scale weld scale quickly and … How to & DIY Metalworking. Local junior college welding programs method proved to be another effective option for removing mill and. Tubing that the frames are made out of, are cold rolled.... `` clean metal '' plasma edges and is a less effective scale-removing agent than acid! Knotted steel wire cup brush on a weld eliminates mill scale before priming and painting that the frames are out. Task as they glaze over very quickly layer of iron oxides and magnetite which the. Over very quickly and painting removing mill scale, but can also remove paint and mill scale a! Sizes all the way to do this with paint is with a oxy/acetelyne torch,!
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