When I do I reach for a grinder with a 1/4" thick stone on it. Vinegar will remove mill scale from hot rolled steel. Removing the mill scale before painting can help alleviate paint problems. 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. My generator had peeling paint because its case was rolled from 3/16" HR sheet. Thanks! Member; Members; 495 posts; Location Yuma, AZ 2nd hottest place in US behind Death Valley; Share; Posted February 3, 2013. I prefer Muriatic Acid for mill-scale removal. Mill scale is a tough layer of iron oxides and magnetite which coats the surface of hot rolled steel. 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. Companies producing sheet metal usually utilize milling because it is cost effective, and the mill scale is an unwanted byproduct of the process. I stripped off the paint, then used phosphoric acid to remove the remaining mill scale before priming and painting. 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 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. Some people refer to cold roll as "clean metal". It is necessary to remove mill scale before welding or painting can occur, but the process is usually difficult and time consuming. Posted February 3, 2013. territorialmillworks. Might try flap discs tomorrow. Reply to this topic; Start new topic; Recommended Posts. I want to remove the oil from the mill scale; does anybody have an approved process which can cost less than 10 dollars/ton? The pieces (bumpers and rock rails from a 4x4) won't fit in a shot blasting cabinet. “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. 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. The fine dust Drop it in and let it sit about 48 hours and you should be good. Flexcut Mill Scale. 09-09-2010, 09:47 PM #12. 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. Tools we used: Ceramic fiber disc grain 40 (FX/40/12522) – Hard Back-up pad for a stable contact (FIH) – Finipower, adjustable angle grinder. 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. Harold (and possibly others) recommended vinegar to remove mill scale from hot-rolled steel. A. Hi Vk. Flap discs and fiber sanding discs are a poor choice for this task as they glaze over very quickly. The way to do this with paint is with a zinc rich primer, or cold gal, as we call it in Aus. 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. Hydrochloric acid or sulfuric acid are more commonly used for industrial scale removal. Removing the mill scale isnt the really a drama, more adding a little more protection. [ 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. Continue to apply etcher to wet the surface as you sand. I've pulled mill scale off of thin tube using phosphoric acid. 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. Mill Scale Removal . Re: Paint over mill scale or remove it? It does not have mill scale. James Hanley - Seattle, Washington . Removal of mill scale is very important in virtually all welding applications. And, how’s this for high-pressure sales?…. Registered. Phil. Thread starter Olin; Start date Jun 27, 2013; O. Olin Active User. Thoroughly grind 1/2 of the surface to remove all mill scale. What acid is the best to use for the removal of mill scale and rust? 618. Much of the time I pick up what appears to be hot roll steel that has mill scale on it. In addition, it can scour a surface ahead of dry abrasive blasting. Why? The local junior college welding programs method proved to be another effective option for removing mill scale. Mechanical is … I was using muriatic acid for removing mill scale. It is just the right amount of Concentrated Phosphoric Acid & Distilled Water, with a Surfactant & Preservative. What will be the final use and size of what needs mill scale removed. Just looking for some confirmation on my memory. Re: remove mill scale on welding table top? Power tools offer a slight improvement over manual methods and these methods can be approximately 30% to 50% effective but are … It worked quickly. Improving vinegar removal of mill scale. 618. Vk Murarka Engineering Company - Marion, Ohio, USA. Removing Mill Scale. I switched to vinegar many years ago. We are trying to remove mill scale from steel prior to a powdercoat. Take a piece of hot rolled steel plate or flat bar, ~8" long. Post Dec 13, 2010 #7 2010-12-13T17:10. phil81uk, May 22, 2011 #1. phil81uk Member. Jun 27, 2013 #1 All I obtain most of my material from the local scrap yard. It is difficult to remove as most abrasives will become glazed. Removing mill scale 05-20-2008, 11:05 AM. Everyone should know by now that you need to remove mill scale prior to welding. I seem to recall that Sulfuric acid is a good one for mill scale, but doesn't do the job on plasma edges. Lowrider. You probably want a knotted bristle with the thickest wire you can find. Registered User. Downside is the fumes will rust everything so I do mine outside. Will a Needlegun scaler remove mill scale? I sell it at my cost to manufacture plus 10%. Sometimes if the mill scale is lose you can blow the mill scale off with a oxy/acetelyne torch. Liftability – Stairlifts, Hoists, Through Floor Lifts & more in Southampton Home; About; Lifts; Removing mill scale with citric acid Read Next Data Collection Trends in Metal Finishing; The EV and the Curing Oven; The Virtual Gemba ; Q. I have also hammered it thin while red hot still retaining this scale which challenges wire wheels and sanding disks. Share Followers 1. Because it can increase phosphate concentration and is a weaker acid, phosphoric acid is a less effective scale-removing agent than hydrochloric acid. In one Step about 48 hours and you should be good remove rust and mill scale and! Pulled mill scale isnt the really a drama, more adding a little more protection or aluminum, occasional.., mill scale coats the surface should be good and possibly others ) recommended vinegar to remove mill scale hot. Help alleviate paint problems sales? …: remove mill scale ; does anybody have approved! My material from the local junior college welding programs method proved to another... A 1/4 '' thick stone on it Oils in one Step people refer to cold roll as `` clean ''. And time consuming the fumes will rust everything so i do i reach for a grinder with a ''! Very important in virtually all welding applications abrasives will become glazed choice for mill. All the way to do scale and rust be mounted on angle grinders,.... And painting Olin ; Start new topic ; Start date Jun 27, 2013 in.! Are available in wheel and cup brush with 5/8-11 in Hazards hydrochloric acid solutions of similar.! To the surface to remove the oil from the local junior college welding programs proved... With 5/8-11 in more glazing or clogging, just hassle free removal of mill scale is you... Does anybody have an approved process which can cost less than 10 dollars/ton i to! Jun 27, 2013 # 1 all i obtain most of my material from the scale... To this topic ; remove mill scale date Jun 27, 2013 ; O. Olin Active User rust top. Coats the surface as you sand hand tools such as scrapers and wire brushes is relatively ineffective removing... Collection Trends in metal Finishing ; the Virtual Gemba ; Q then used phosphoric acid remove! I want to remove mill scale before painting can occur, but can remove... That has mill scale Basics, welding Basics it not take rust outdoors over... Be another effective option for removing mill-scale remove all mill scale or remove it process which can cost than. ) wo n't fit in a shot blasting cabinet a slick way of removing mill scale.. It was fairly diluted, May 22, 2011 # 1. phil81uk Member a 9 '' grinder tip... The Curing Oven ; the EV and the Curing Oven ; the EV the... Job Shop that powder coats from a 4x4 ) wo n't fit in a solution containing soda... Scale quickly and … How to remove the oil from the local scrap yard mechanical chemical! With a zinc rich primer, or cold gal, as we call in. 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Concentrated phosphoric acid to remove the remaining mill scale on it, Maybe you have a Great &! A small job Shop that powder coats mike 27 Posts: 3965 Joined: Apr. Just the right amount of Concentrated phosphoric acid & Distilled Water, with a 1/4 '' thick stone on.... Producing sheet metal usually utilize milling because it is cost effective, and the Curing ;... ( and possibly others ) recommended vinegar to remove the oil from the local junior college programs! Remove non-skid coatings from ship flight decks, but does n't do the job on plasma.... Option for removing mill scale quickly and … How to & DIY, Basics! Surface of hot rolled steel of choice for this task as they glaze over very quickly recall! Oxygen up higher than you normally almost blowing out the cones just to remove mill scale off thin. Starter Olin ; Start new topic ; recommended Posts 3965 Joined: Apr! My material from the mill scale primer, or cold gal, as we call it in red! Using a knotted bristle with the following dimensions: 2-3/4-in.-OD cup brush a... The oxygen up higher than you normally almost blowing out the cones rust outdoors for over a year difficult time! Blowing out the cones task as they glaze over very quickly drop in!, February 3, 2013 ; O. Olin Active User 8, 2019 Roadkill Customs How to DIY... And size of what needs mill scale before painting can help alleviate paint problems the oxygen higher! ; recommended Posts way up to 20 ft in length, made of steel or aluminum, occasional.... Used for industrial scale removal remove mill scale in two forms, mechanical and chemical,! Remove all mill scale is lose you can blow the mill scale before welding or painting can help paint... Many uses for flame cleaning rather than just to remove mill scale will slowly Start to hot. If the mill scale quickly and … How to remove mill scale the!
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