what is mill scale on steel

The underside of the plate is coated with scale also and sits on a cementitious grout. the "mill scale" on 304 is chromium oxide. Regards. My understanding is that a majority of mill scale is used in sintering. Mill scale is formed on the outer surfaces of plates, sheets or profiles when they are being produced by rolling red hot iron or steel billets in rolling or steel mills. Q. I am particularly concerned about the effects of Mill Scale if left in place and painted over. I have read the letter No 38657 of Mr KEN VLACH Dec 20-2005, & appreciated the efforts being done by Finishing.com & through this platform I want to ask & reply or propagate the information for future compilation for valuable readers. What are structural steel fabricators doing about surface preparation, and what options are available? Mill scale is a type of iron oxide that is formed on the surface of the steel during the hot-rolling process. Mill scale is the product of oxidation which takes place during hot rolling. endobj One is to compress the mill scale into giving up the oils and lubricants and water to an acceptable level for the feed to the sinter plant where the mill scale is mixed with other iron ores and hydrocarbons from coke plants and bake it at 2500 °F. Rolled-In Scale There are really many different processes. My question is this: What is the best way to fake or apply a finish that closely resembles black mill scale on a hot rolled sheet? (Fe,Al,Cr)2O3. It … I refer you to the following US patent for details: US Patent 5047083, "Process for de-oiling mill scale". And by feasibility I mean are companies from other industry verticals (apart from reuse in sinter for steel production) using mill scale in large amounts. A steel mill or steelworks is an industrial plant for the manufacture of steel. I have a question about what happens to make scale? Q. Hello: I want to briquette Mill Scale Dust removed from a Shot Blasting Operation. Steel surfaces can sometimes exhibit residual mill scale as a side effect of the production process. It is usually less than 0.1 mm (0.0039 in) thick , and initially adheres to the steel surface and protects it from atmospheric corrosion provided no break occurs in this coating. Here, I am using hot rolled mild steel 1/8" thick angle iron. I prefer Muriatic Acid for mill-scale removal. Maybe a MIG arc spray with pulse is the correct procedure for welding through mill scale comprised of many different forms of Fe oxides that are quite hard, really do not know. Mill scale is the flaky mixture of iron oxides that form on the surface of hot steel. The very high surface temperature combined with high roller pressures result in a smooth, bluish grey surface. It may depend on what type of equipment, but to the limits of my experience base plates are always painted, and to properly paint them requires removal of mill scale. Mill Scale vs Rust As stated Mill scale is basically rust or iron oxide, but rust happens over time and exposure to the elements. This technique will get through the mill scale and rust, leaving you a nice finish that is ready for paint, powdercoat, or welding. Mill scale is dark grey iron oxide formed as a layer on hot rolled steel. Piet van der Horst explaines it all in this article. I always have a 5 gallon bucket sitting around for small parts to soak in. Is there any free iron available in typical Mill scales. Use mill scale briquette machine can turn the small mill scale to briquette and suitable to use in the furnace.. What is mill scale. The spheres have the black mill scale on them which needs to be removed for the finished product. Fast and leaves a fine profile for painting. It doesnt interfere with tig welding. As far as recycling it to make other steel, the answer is yes it is being done at steel mills that employ a sinter plant. Scabs are always the same chemistry as the steel bloom or billet. Thank you in advanced for your time and effort! In such a case, a bare metal surface might be better than a discontinuous mill scale (or any other cathodic coating) as the former will corrode more uniformly as against the possible severe localised corrosion of the latter. {$��G��6S̿ϊIئll����L�=�}����Z�1�iJRљT4�v\(uU�Z~��7������q6l[®d������G\�5~��@iU����掟�Ocg���E;V빕���������l3_t�5~׳-nT�m��L l� Specifiers frequently abrasive blast clean the steel with no intentions of coating it to allow the patina to form more consistently across the surfaces. The smelting processes were carried out using carbothermic reduction in a submerged arc furnace. Another patent suggests a mixing the mill scale with calcined lime followed by a burning process to form pellets. If the Mill Scale is on the plates, under vibration, the scale breaks down to dust and effectively leaves a void. A rolled-in scale defect occurs when mill scale is rolled into the metal during the rolling process. �F@@���AP"4>4�@������&]C��{wV���Q��o��:���� Q. Hi All, Here in the Southwestern United States, a trend in architectural aesthetics is a heavy industrial look using hot rolled steel where the mill scale is left intact and you can see the heat marks left by the rollers in the factory. Salt air will hasten rusting. If anyone is interested, I can direct you to some photos on our website or social media pages to show you examples of this. Further to my previous 2 blogs on mill scale, I seem to find more information in my aged brain, therefore, I wish to explain what it looks like after it is removed from the steel and what to do with it. If you are installing heavy, rotating equipment what are the policies for the base plates, regarding mill scale. Definition - What does Mill Coating mean? Murarka, Mill scale is a metallic dust that is a by-product of steel. Mill scale is generally formed during the manufacturing of iron or steel. Ted, It is insoluble in water and alkalis. ���)�b�u�9�cJ۴�����^^|�oV�x�)����������p����a�oW�����������z����[���f�YU65�R���4uѴ�tuB�2 ��֍�o�R��pB'(B)���r�U��w� \{�LWV�}��_o�a����k����Ů.��U%�l�ϸ��0Aw�3�ȌDd�ym��mY�� ��t]���Wi\���H��M� @ô#t"fX�Nf�� ;E����@�R$�D�/�Lu(���� +�Ⱦn:X|q (��?�������=��|����\���|�f�ŧ��|af�E3{�~����? Mill scale is the flaky mixture of iron oxides that form on the surface of hot steel. Q. *unlike general heating or heat treatment scale, where Al, Cr, etc. Q. However a few years ago the EPA found that some of the ingredients, mostly from the lubricants from the rolling mill oils, caused the mill scale to be a hazardous material. One method is using water to separate the oil content from the solid by high shear agitation. 2) Small Lot= Less than 454 grams net Mill Scale Removeal on Steel Right now the materials are supplied by the customer, he brings me 8", 10" and 12" steel spheres, that are two halfs welded together. Wow! The best way by a mile is to use dilute muriatic acid. Cold rolled steel doesn’t have mill scale on it but it is more expensive to buy and is not suitable for all applications. I posted an earlier question with no response - whether applying a rust converter in a selected pattern on a rusted surface would also allow you to add visual interests or does the rust margin creep under and push off the converted rust? A mill coating is the coating condition of a metal product (such as steel pipe) applied at the mill where it was produced. So, further processing and experimentation and trials and tribulations must be done to be able to recycle and use all of the 10 million tons per year and growing. Blackened steel finishes for decorative metals ,bulk cargo mill scale ,dcc bv detection of mill scale,effect of mill scale on the long,everything about mill scale ,how to clean new steel without sandblasting 4,how to weld through mill scale ,iron mill scale ferrous oxide feo ,macro defects in steel ,mill scale , It had a thick layer of mill scale on it. Steel makers allow this to occur as it will form a protective coating from further rusting to occur for a period, normally 1 mm per year under normal ambient conditions. x��I����H.�r�U�����-�no[3��=%���#�j������6���*� �wf�x���駗�/���Y���y���g�iK� ���4e�hm�OȪ�q���� Mill scale immediately starts at the steel making stage of casting hot metal steel grades and steel alloys when the metal is in a liquid stage. Mill scale can be used in other iron ore preparation for steel making but it may require crushing and grinding it to very specific sizes and too expensive or it can be briquetted and used directly. There are 7 in the U.S. and almost all steel mills in Europe, China and other places like India employ them with the use of the blast furnace to make steel. We are out of time on this project so I can't wait for them to receive the correct material and start over. However, the lowest oxide, FeO, is said to form only above 570 °C. The only time it is not, is when the caulking fails and traps moisture, or air conditioners drip steadily on hot rolled steel causing it to fail. 2 0 obj Mill-scale; how is it formed, what are its characteristics and more importantly, how can you remove it? Mill scale varies in thickness. Some people take used motor oil, spread or spray it thinly over the material and light it on fire. & Install'n Chemicals & Consumables Obviously, it is a rich source of iron. new LazyLoad({ So, if I was to remove some of the mill scale selectively, in a decorative pattern, the finished piece might develop a pattern as parts rust differently. What Is Mill Scale On Steel? The steel rebars with and without mill scale were embedded in mortar with about 5.5 mm of the cover thickness (shown in Fig. I have never seen such concise (and correct) descriptions and explanation about mill scale and "what it is" before reading these entries! Mill scale is oxides of iron and alloying elements present in steel. Mill scale is porous and poorly adherent scale of magnetite, it will only give limited short term protection to steel against corrosion. 2(a)) and the mortar was cured for 28 days in a container kept at room temperature and at 95 %RH or higher controlled by using saturated K 2 SO 4 solution. A. Hi Vk. the "mill scale" on 304 is chromium oxide. Hi, Les. It doesnt interfere with tig welding. Mill scale is a kind of by-product from the steel making and rolling process, its main components are FeO, Fe2O3, Fe3O4 and a small amount of iron and other impurity elements, with the content of TFe around 70%. The cement plants looked for other sources of the iron and mill scale became a personna non-grata. The problem is that they ordered a "clean" hot rolled material where the mill scale has been removed. }, It is easy to understand why the oxides form in a specific sequence in a mill scale. Therefore if a steel mill wants to make rebar and they buy mill scale from the open market and it comes from an alloy shop what do they do with the other elements and how do they get it out? Mill scale is less reactive than the steel surface it covers, acting as a cathode to the more reactive material underneath. Though not harmful in and of itself, the presence of scale is detrimental in conditions where corrosion is likely to occur, and it must be removed before a workpiece can be given a protective coating. A. I have a substantial restoration business in NYC restoring old "wrought iron" doors, windows, and architectural metal work. You are welcome to attributed fair use, of course, and to mention my name ... but unless individual responders reply to your offer, we certainly can't speak for them regarding their permission to use their name in a different forum or media. "Disturbing" here is defined as breakage of oxide scale or reduction in thickness of scale due to mechanical vibration or by heat. That costs money and lots of it for the procedures and the equipment and the chemicals to eliminate the unwanted stuff. You just put up sheets of hot rolled material and you're done. This technique will get through the mill scale and rust, leaving you a nice finish that is ready for paint, powdercoat, or welding. Comments on applying finishes over mill scale gave me a sculptor's idea. I also have a background in metal working and have studied metallurgy fairly in depth. �^���i�l5�aq�9K"� �,�)�;����5�Bh&(Z» N�&b�G].��h��p�RET;�". Mill scale is formed on the outer surfaces of plates, sheets or profiles when they are being produced by rolling red hot iron or steel billets in rolling mills. Other plants that use the EAF (electric arc furnace) cannot use them as it would take an ungodly amount of energy to extract the iron from the mill scale unless it were put through a major amount of preparation and chemical reduction first. However, a value-added utilization of mill scale is in steel making after converting it into briquettes. A rolled-in scale defect occurs when mill scale is rolled into the metal during the rolling process. Today on an annual basis with1.4 billion tons of steel cast worldwide, that means there is produced around 10 million tons of mill scale per year. Q. } Hi, Les. Does it have any long term negative effects on the steel or subsequent paint or coating surfaces. If you need a product/service, please check these Directories: Jobshops Capital Equip. In addition to the explanation on where mill scale comes from and how it forms -- mill scale is sold on the commercial and international exchange mainly to the Chinese steel makers that use low quality iron ores either domestically mined or purchased. Sanding it off with roloc discs is ok for real small things but its slow (and the discs aren't cheap) and … This allows pickling acid (HCl) to attack the more soluble (partially transformed) inner wüstite layer. It may refer to the mill scale produced from a milling process such as weld slag. Therefore, its presence could be indicative of the scale being mill scale, which might be easy to confirm if FeO is retained at room temperature, without further oxidation to a higher oxide, for sufficiently long time. window.addEventListener("load", function(){ Mill scale is defined by the ASM Metals Reference Book as “The heavy oxide layer that forms during the hot fabrication or heat treatment of metals.” In my experience, I have only heard this term mentioned in association with steel manufacturing. Companies producing sheet metal usually utilize milling because it is cost effective, and the mill scale is an unwanted byproduct of the process. Total generation of mill scale at JSWSL is around 150 t/day and contains 60–70%FeO and 30–35%Fe 2 O 3.To recover the iron, the mill scale must be smelted in a blast furnace or other reduction furnace; however, it is usually too fine to use without previous agglomeration such as via pellet or sinter mix. The grout is water based which could result in the Mill Scale separating from the plate. Rest in peace, Ken. Mill scale is a kind of by-product from the steel making and rolling process, its main components are FeO, Fe2O3, Fe3O4 and a small amount of iron and other impurity elements, with the content of TFe around 70%. Though not harmful in and of itself, the presence of scale is detrimental in conditions where corrosion is likely to occur, and it must be removed before a workpiece can be given a protective coating. } I often forge stainless, which means it has Real mill scale- its all over dark gray. 4 0 obj Great job! Mill scale is one of waste materials which is produced as a result of hot rolling of steel in all steel companies. A. Nathan, Any crack or hole in the mill scale to reach the base metal will continue the rusting effect. Mill scale does not tint consistently - the colors can fluctuate across a single piece - so it is best to not rely on an even coating of mill scale to supply the color for your form. Meaning that if there are any other ingredients in the steel, carbon, any alloy or additive it will also be in the mill scale. Removing Mill Scale from Steel Surfaces - Latem … Steel surfaces can sometimes exhibit residual mill scale as a side effect of the production process. Nominal Chemical Formula: FeO. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful. It is brittle so if there has been any cold work after mill forming, the mill scale will crack and provide attack points for corrosion. A hot-rolled mild steel can result in mill scale on the material surface, which is more difficult to properly weld. What are the pros and cons? It should be noted to remember that all mill scale will include the exact makeup of the cast metal or steel and alloys. Can these briquettes be used as material to be remelted for Industrial Steel Manufacturing in EAF type of process? P+O is A36 without the scale. A. Steel mills descale sheet and plate by passage through scalebreaker rolls, which flexes the metal enough to fracture the scale. Mill scale is oxides of iron and alloying elements present in steel. The richness of its iron content makes it a very attractive industrial waste. Obviously, it is a rich source of iron. Finishing.com has received thousands of helpful postings, but this is one of the most thorough and exhaustive ever. required under REACH regulation for this substance. I never designed in that field and can't comment on codes or standard practices for heavy gas turbines, but I do agree with you in general that steel structures require removal of mill scales, and that same opinion has already been offered here by Burt Olhiser and Vijay Vijayaraghavan. Soluble in most strong acids. A. Cracks in either type of scale allow the pickling acid to penetrate the scale layers and dissolve the inner layer, causing the bulk of the scale to be removed in flakes. what is the scale pit in the steel mill. We specialize in building offset barbecue smokers and grills for commercial, competitive, and residential use. I ordered sheets of hot rolled steel from a large company in the midwest to be perforated (punched) in such a way where the different sized perforations make an image in the steel. Q. How Google uses data when you visit this site. Mild steels that have been cold-rolled have a clean finish but sometimes have a light oil on the surface. Being produced during the reheating, conditioning and hot rolling operation, mill scale initially adheres to the steel surface and protects it from atmospheric corrosion, provided no break occurs in this coating. <> The Chinese steel makers then mix the mill scale with the low quality iron ore and prepare it for feed to a sinter plant, whereas the iron ore is mostly less than 60% Fe and the mill scale is around 70% Fe. Another question I noted was about finishing: it absolutely must be removed prior to any use of the steel and/or finishing. Mill scale is an oxide layer formed on the surface of the steel when it is produced. It may be an integrated steel works carrying out all steps of steelmaking from smelting iron ore to rolled product, but may also be a plant where steel semi-finished casting products are made from molten pig iron or from scrap . elements_selector: "iframe" If you plan on coloring any piece of Hot Rolled, you must first expose the base metal by grinding away its shell of oxidation. Rolled-In Scale new LazyLoad(); Mill Scale, especially thick mill scale can cause porosity – holes both on the surface and under the surface of your welded joint. Mill scale is formed on the outer surfaces of plates, sheets or profiles when they are being produced by rolling red hot iron or steel billets in rolling mills. New weathering steel develops a mill scale layer when it is manufactured (similar to hot rolled carbon steel); however, it is often a dark purple color instead of the traditional slate blue color. Mill scale is an iron oxide waste generated during steelmaking, casting and rolling. As the hot material encounters oxygen, an oxide layer—mill scale—forms on the surface. Any expert opinion around this would be greatly appreciated. Before we talk about welding through it, it’s important to know exactly what mill scale is. This work aims at conversion of mill scale by adjusting smelting processes to produce different valuable products. *r#�>З��rxX�סb�`:�$�?�I���r��R�R��z�m�I�#�G�}Dz�4���.OHkˮ�B)�=��GI�U�WȹyA��"�/�����o������~�\�B�-n�Ml{�!�|�޻���z���gݨR�|eG]W�evv*��u2����TUe���jߝ-j���Oe�Ju���g���% �� We are constantly refinishing old Fenestra-style windows and doors, chemically stripping them, and repainting. If you are coating any steel surface against corrosion it is necessary to blast clean (with garnet or similar) to a finish of Sa2.5 blast standard before coating. This is not very neighborly, to say the least, so a few companies have come up with alternatives. 34.4.1 Structural steel (thickness greater than 5 mm) Abrasive blasting Abrasive blasting is generally the most suitable and reliable method of obtaining a visually clean surface and a satisfactory surface profile. The substance Mill scale (ferrous metal) [EC: 266007--8] does not fulfil any of the criteria of the REACH Article 14(4) (see legislation extract on 32). I am hoping I can have them proceed with the punching and when I receive the material, just apply a chemical or something that would closely resemble mill scale. What is the effect of steel mill scale on shear blade if the steel plate is sheared without pickling or shotblasting. Mill scale, often shortened to just scale, is the flaky surface of hot rolled steel, consisting of the mixed iron oxides iron(II) oxide (FeO), iron(III) oxide (Fe 2 O 3), and iron(II,III) oxide (Fe 3 O 4, magnetite).. Mill scale is formed on the outer surfaces of plates, sheets or profiles when they are being produced by rolling red hot iron or steel billets in rolling mills. What is the chemical reaction that happens? "button": { When you are applying a coating to a steel surfaces in order to produce sufficient adhesion against corrosion it is necessary to remove all contaminants off the surface. A. The squished out oils and lubricants by the way are recycled to be used once again. Thanks! How much they add is dependent on their steel making processes. Moreover, it is cathodic (and not anodic like zinc) to iron and hence will corrode much faster at locations of discontinuity due to unfavorably large area ratio of cathode to anode. Q. "text": "#237afc" researched responses. ©1995-2020 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy Flux-cored Gas-shielded Wire. It is usually less than 1 mm (0.039 in) thick and initially adheres to the steel Sometimes it is forced to occur by a light spray of moisture. <>>> Q. Hi, I am researching ways to measure the thickness of mill scale formed on hot rolled steel coils. I have been taught that it is poor engineering practice to install equipment on a mill scale surface. It is an assortment of iron oxides, regularly, ferric and is dark in color. I did this at TechShop. The FCAW process is well-suited for welding through thick mill scale because of the high level of deoxidizers in the wire and the slag system it produces. I've pulled mill scale off of thin tube using phosphoric acid. "background": "#fff", With very slow cooling, small grains of Si- and Ti-containing oxides may precipitate within the scale. A – Steel surface covered completely with adherent mill scale and with little if any rust; B – Steel surface which has begun to rust and from which the mill scale has begun to flake; C – Steel surface on which the mill scale has rusted away, or from which … It is commonly less than 0.1 mm and primarily follows the steel exterior and protects it from environmental erosion to avoid any damage. And that welds just fine too. <> Without question in my mind, the mill finish is more durable than the typical oil alkyd paints made since lead paint was banned. Don't try this at home kids! In some cases the steel mill will encourage it to form a protective coating on the casting. Are there other feasible uses as well (in cement and other such industries) If you are coating any steel surface against corrosion it is necessary to blast clean (with garnet or similar) to a finish of Sa2.5 blast standard before coating. A. When the base material has a light mill scale or rust, it’s recommended to remove it. Can anyone suggest a way to make a Bakelite mold without disturbing the oxide scale so that I can use the mold to measure the thickness of oxide scale? Alibaba.com offers 1,349 mill scale steel products. Can anyone corroborate my thinking. 2. The mortar was produced by mixing water, ordinary Portland cement powder and fine aggregates. These are on a penensula. I have been tig welding a LOT of stainless for over 25 years now, and have never cleaned it up before welding. Here, I am using hot rolled mild steel 1/8" thick angle iron. Mill scale, dirt, laser scale, rust, heat-treat scale, grease, and dust interfere with paint and coatings’ adhesion to structural steel and must be removed before steel members can be coated. It will remove all mill scale, rust, plating, etc, in about 15 minutes. There is also the consideration of what are the elements that are in the mill scale. �/d}2�� �`���L�V�5=hY����V1P�-�H�ї;8���8&�Fa5# v��i�a�9���!����&�PeD^b���E������(�Ti�H����#�a\��Yh�Y��EerŴh���Y���k�l�sbr�ĭ�%q\nX�Xb|��L�}��y�k|��I��0�7Ƶ�����PM�'��(� Mill scale production is equal to 1% of all cast steel in the world. Mill scale is the product of oxidation which takes place during hot rolling. Mill scale is porous and poorly adherent scale of magnetite, it will only give limited short term protection to steel against corrosion. We always leave it intact, unless the client doesn't want it. The ASTM standard specification for deformed steel reinforcement and the Concrete Reinforcing Steel Institute (CRSI) Manual of Standard Practice both give the same information: Reinforcing bars with rust, mill scale, or a combination of both should be considered as satisfactory, provided the minimum dimensions, weight, and height of deformation of a hand-wire-brushed test … Mill Scale Metalworks is a fabrication shop in Lockhart, Texas. <>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Once the scale coating breaks (which occurs easily) and moisture comes through, the presence of the scale iron oxide accelerates the corrosion process at the breakage point. Thank you for your hard work It had a thick layer of mill scale on it. Q. Hi I am Muhammad Bilal, working in a steel-making industry as a refractory trainee engineer. %���� I am continuing my response on mill scale, if I may . satyendra; May 25, 2017; 1 Comment ; Hematite, hydraulic cleaning, magnetite, mill scale, primary scale, Reheating furnace, rolling, secondary scale, wustite,; Mill Scale. I would like to first say that I am very impressed with the knowledge here! Mill scale is composed of iron oxides mostly ferric and is bluish black in color. Anyways, as for my question: From our experience stripping thousands of windows and hundreds of doors, the mill finish is generally intact, and protects the steel. I am currently doing a study on mill scale uses. Most of the steel plants recycle mill scale through sintering or pelletization. One Reason Only: It Works Faster. Mill scale is molded on the outer exteriors of billets when they are being manufactured in rolling mills. "background": "#237afc" The average hourly wage for a Steel Mill Worker in the United States is $24 as of October 28, 2020, but the salary range typically falls between $24 and $29.Hourly rate can vary widely depending on many important factors, including education, certifications, additional skills, the number of years you have spent in your profession. The thickness of the mill scale varies from 50 to 500 microns depending on the rolling conditions and the quality of the steel. Secondly if left in place and painted how can in be removed in the field. Thank You. The most common metal-cored wire for welding mild steel with mill scale is E70C-6M. What many outside of the metal fabrication trades don't know is that Mill scale is so tough it can only be removed by mechanical processes like grinding or grit blasting, and it doesn't take patina. Vijay. . Or it may be an additional protective coating applied by the manufacturer. And that welds just fine too. I often forge stainless, which means it has Real mill scale- its all over dark gray. endobj - How can you mimic a finish that resembles mill scale on sheets of hot rolled material that has been de-scaled? Companies producing sheet metal usually utilize milling because it is cost effective, and the mill scale is an unwanted byproduct of the process. Chemical Name: Iron oxide. D A Bayliss FlCorrT, FTSC, in Plant Engineer's Reference Book (Second Edition), 2002. Just some ideas to your question for de-oiling mill scale: Most of the uses of mill scale are patented. In response to the question on whether or not mill scale on hot rolled steel is detrimental, I would submit that is very much so as it is anodic to the steel. There are a few things you can try on a few small samples to see which you like best. During welding, mill scale hinders the flow of the liquid wel… Coating over mill scale, however tempting, is a futile exercise, as the presence of mill scale on the steel surface accelerates the corrosion of the underlying steel. Although, some people do like “the look” of hot rolled metal and have incorporated it on the exterior for design purposes. The finish of cold rolled steel will be overall better than hot rolled, because of the mill scale that develops when it’s heated. I have been tig welding a LOT of stainless for over 25 years now, and have never cleaned it up before welding.

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