1018 is the alloy of choice for Cold Rolled Steel for sheets, which it is more costly than A36, and it arrives scale free. Black stainless steel is growing in popularity. Variations in the color and shade of the mill scale is expected and desired. These stainless steel finishes can also be patterned if necessary for the application. This technique is less costly than chemical patinas and is generally more consistent in color. Considered the most widely used surface finish, 2B is the basis for most polished and brushed finishes. These coatings add a layer of depth and richness, darkening the oxidized finish while inhibiting corrosion, AKA Rust. Blackened Steel sounds like one of the easiest finishes to achieve in decorative metals, yet this is the most widely misunderstood and complex of metal finishes. These are commonly fitted with special shaped abrasive wheels known as mounted points. (electroplated) Most metals. Beyond that, abrasive powders are used in combination with leather or felt wheels to polish (1-32 µ-in.) Finally, don't forget to specify the sheen when thinking of these top coatings. CE Metal Fabrication provides top quality workmanship with superior materials creating the best Commercial, Industrial & Decorative metal fabrication. Bright, blue-white, lustrous finish. When compared to stainless steel, these two finishes are dominating the market. Because of the wide variety of processes and materials, this creates opportunity for conflict with other trades for the architect, designer and owner. It also includes methods of metal cleaning, descaling, deburring, etc. Fabricator to use A36 Mild Steel Sheets with Mill Scale in tact. EPi’s mid-temperature black-oxide process, Kool-Blak 225, blackens steel in 30–45 minutes and converts it to black iron oxide magnetite, which provides a glossy black finish as well as protection for the part. Six Common Methods and Formulas for Metal Finishes. 8 Mirror finish is created by mechanically treating the surface with a series of progressively finer abrasives. Here the variables of mechanical finishes, metal surface pretreatments, water and metal temperature, water hardness, humidity and so forth, can be properly and safely managed. Sherardizing is a process used to coat small steel parts such as bolts and washers with a corrosion-resistant zinc-iron alloy. Case hardening is used on the shackles of padlocks, for example, to produce a shell that resists mechanical attack. 1 Finish is produced by rolling stainless steel that has been heated prior to rolling (hot-rolling). Hammered. 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Vibratory finishing machines are used to deburr products and remove sharp edges, sprue, etc. Traditional smiths finish metal with wax or oil; when choosing oil, a drying oil, such as boiled linseed or tung oil, is a better choice than raw linseed oil or mineral oil. Fabricator must supply a full sized sample of each shape with specified finish for architects approval. Epoxy Coating. Substitute commercially available Butchers Wax … Company. The process involves UV or heat curing of dry thermoplastic or thermosetting polymer powder onto the metal to produce a textured, matte, or glossy coating. From a blasted and pickled finish to a polished mirror finish, architects and designers have many options. Powder coating applies a decorative finish that is similar to paint but with greater durability. Sometimes steel surface finish is also referred to as surface texture or Surface Roughness. The appearance of this finish is a dull-gray, matte with a typical Ra value of approximately 3.5 – 7.5 µm This type of finish is used across industrial applications in which a specific finish is not required. Dents or deep gouges are not acceptable. Colours are agreed between the manufacturer and the customer. Gun Bluing (Black Oxide) Steel bluing, also known as gun bluing, oxidizing and black passivating, is a process by which the metal is given a rust-resistant finish. The machine’s cycle speed and magnitude of vibration are usually variable, allowing effective treatment for a range of small- to large-sized parts. 2B (Bright, Cold Rolled) Lacquer shall be applied to coating mfrs. Clear powder coats, while durable like urethanes, is not an option as the water and chemistry of the pre-wash will interfere with the black oxide coating from the patina process. Hot blackening machines spread a thin layer of black oxide onto a product’s surface to create a matte black finish with high abrasion resistance. A textured powder-coat finish is highly effective in hiding surface defects. Choose from patinas, cleaners, degreasers, lacquer and spray paint. The polishing process enhances appearance and consistency, making cleaning easier. The surface of any steel that is to be oxidized must be specified. If desired, professional finishes like wood paneling, stucco, brickwork, wainscoting, or masonry can be applied to make your steel building look like a regular wood-framed structure & blend in with your existing buildings. Stainless steel finishes are an important aspect in sanitary food processing equipment, as finishing options alter more than just the appearance of the metal. The effect is also multiplied when the black finish is buffed back enough to reveal the texture of the metal beneath it. A Black oxide finish, on its own, is only mildly corrosion resistant, and the colors tend to be flat or matte, so often in architectural applications, there is an additional clear coating applied. California Do Not Track Notice. Therefore "blackened steel" as a finish specification is as clear as texting a salesman in a large clothing store for "blue jeans" or ordering "white wine" in a well stocked wine shop and expecting they will deliver EXACTLY what you have in mind. It is an electrostatic process wherein a charge placed on the substrate attracts the powder particles to it. Surfaces that are more than 10% abraded will not be acceptable. It also masks the after-effects of welding and hides surface damage.No. Mill finishes, whether hot or cold rolled, are the basic supply condition for all stainless steel flat products. Sandblasted Can Your Company Help Provide Critical Supplies? The Hot rolled steel features the blue grey mill scale. Blackened zinc has similar challenges to blackened steel, but it protects the steel from rust and is much more resistant to corrosion. Ignoring for a moment that there are many different types of steel used for decorative purposes and even more ways to mechanically alter the steel for visual effect; Steel is "blackened" using a wide variety of paints and powder coatings, chemical conversion coatings (which are often referred to as patinas, gun bluing or black oxide finishes), as well as waxes. Honing and lapping use abrasive compounds to improve the surface roughness of mating parts by rubbing them against each other (such as lapped engine valves) or running a mating shape through a hollow (such as a honed cylinder). Thomasnet Is A Registered Trademark Of Thomas Publishing Blackening agents will darken the zinc and not the steel. No. Thus, these same methods are often employed simply for improving surface aesthetics. The surface finish of a machine part may be important to reduce friction with other machine parts or to improve the aesthetics of the part. Lacquers certainly offer the added benefit of being easily removed and refreshed when the time comes but many of them perform poorly when exposed to cleaners like ammonia so they should be avoided in areas like kitchens and bathrooms and floor trims where cleaners are used. In addition, wire brushing is used to remove the slag produced by some welding operations and to remove scale and grit from metal surfaces prior to cleaning. Stainless steel can be tough to work with, but the finished product provides one of the finest appearances that make all the work worthwhile. Often, there will be a combination of two or more of these processes used to reach the desired finish. If you want a fine, high luster, consistent finish, then all exposed surfaces should be pretreated by the same mechanical means such as brushing or sanding, or even polishing prior to the application of the patina. A surface grinder is the most common form of grinding machine but there are numerous specialty grinders such as centerless grinders and Blanchard grinders in everyday use as well. However, the hot roll side, with the blue gray mill scale, looks fairly clean. Shown here is a grit blasted finish on A36 steel rods, blackened using a flat black lacquer and top coated with a clear lacquer. Numerous varieties of hand grinders are used for metal removal, slag cleaning, etc. Here is an example of two parts which are turned from cold rolled steel bar: one has been nearly polished and is ready for patina, the other has been patinated and lacquered. Though standard Black Oxide is set up for steel, it can be done on other substrates including stainless steel, copper, and brass among others. Henry Ford. These will show through a typical semi transparent, patinated and lacquered blackened steel finish so the entire surface will need to be re-finished to match, adding time to the project. When it comes to bringing out the natural beauty of a highly figured piece of wood, such as quilted maple or quartersawn oak, nothing beats a hand-rubbed Danish-oil finish. The process that reduces surface roughness also increases a metal’s luster as reflected light is scattered less from smoother surfaces. The sandblasting process (also known as bead blasting) forces sand, steel shots, metal pellets, or other abrasives onto a substrate at high speed. It is also used to reduce surface roughness beyond the capabilities of machining operations for parts that must mate or seal. Bluing guns are achieved by an electrochemical process in which the iron in steel is converted to magnetite, or black oxide. ico-arrow-default-right, Image credit: Vadim Ratnikov/Shutterstock.com. Copyright© 2020 Thomas Publishing Company. Grinding machines use abrasive wheels to smooth out surfaces. © 2020 • Wiemann Metalcraft • 639 West 41st St • Tulsa, Oklahoma • 74107, "Blackened Steel" Finishes for Decorative Metals, Source for Excellent Custom Architectural Metal Fabrication, Finishing and Installation: contact. Black stainless steel refrigerator from Samsung. 1. Thomas Regional® are part of Thomasnet.com. Experienced designers will understand the steel required for the fabrication and specify the material taking the finish into account in the construction documents. ... A file is a piece of very hard steel that has a series of parallel grooves cut into it, which leave behind rows of sharp cutting teeth. There are several types of grinding machines designed to deliver different levels of finite smoothness. Doug Bracken, President Wiemann Metalcraft. These finishing machines create a uniform, parallel grain surface texture to smooth out a product’s exterior. Shot peening is a blasting method used to impart compressive stress in the surface of metals as a way of improving fatigue resistance, stress corrosion cracking resistance, fretting resistance, etc. The alternative is to either have the item made from stainless steel (which is much more expensive and gives a completely different look) or to finish the mild steel in an anti-corrosion coating of some kind. A rust patina is exactly as it sounds, a coating of rust oxidation on steel. Click on materials or finishes for each manufacturer for more information. Roughness is measured in micro-inches with about the most exacting machining processes (reaming, broaching) producing surface finishes of 16-125 µ-in. Dents, Scratches or gouges are not acceptable. This is among the best options for industrial applications. Unlike plating, metal finishing with brushes is an effective method for removing surface imperfections. Physical samples are critical to setting expectations for finish quality and can even be used for exposure tests, but they can also be misleading. Or, if you need a patina finish but want to create similar hues, consider applying tinted clear coats or waxes over the patina to create a more even finish. This guide reviews some major finishing methods, as well as applications and considerations for choosing a metal finishing process. Has relatively hard surface. When possible, fabricator shall use Cold Roll Steel Sheets and Bars. Mill Finish Our standard finish for stainless steel tanks is a mill finish. Metal plating can improve a product’s durability, corrosion resistance, surface friction, and exterior appearance. Care must be given to prevent scratching from handling. The polished metal, combined with the high gloss lacquer give the finish a black mirror effect with lots of depth. Preserve the Beauty of Raw or Rusted Steel & Iron Surfaces: I see many ibles made with black pipe here but rarely do they mention any coatings to prevent rusting. No. As plating is a chemically intensive, large scale process, it is almost invariably performed by plating service providers who specialize in the field. It is a high-temperature hot finishing process in which the product is inserted into a series of tanks containing cleaners, caustics, and coolants. using abrasive wheels or mounted points. Prior to oxidation (Patina), all exposed steel will receive a fine linear grain finish, following the direction indicated on drawings. Brushed. Variegated patinas can be applied in countless ways to add visual interest to steel. Common Finishes of Stainless Steel There are many different styles of finishes available on stainless steel shapes. "Give them any color they want as long as it is black!" If your company can help provide supplies, capabilities, or materials for products such as N-95 Masks and Tyvek Suits — Please let us know. Oxidizing in a finished space will therefore pose significant hurdles. If the desired finish is rustic, perhaps a spot patina on only the areas where the mill scale has been ground away is all that is required. All Rights Reserved. Even showing a clerk a picture of a glass of white wine barely narrows the search. Often, the surface has a smooth, reflective grey matte finish, meaning it’s dull and unreflective in appearance. Is the surface likely to need touch up or repair work from installation or service? COVID-19 Response: Source manufacturers & distributors providing COVID-19 medical supplies Five Common Types of Metal Finishes Antiqued. The epoxy is also called a … Therefore designers who want the Mill scale look are prepared to accept its inherent unpredictability and probably more than a few scratches. Care must be given to minimize scratching from handling. The black oxide finish will be relieved by 50% using soft scotch-brite or steel wool that reveals the bright metal surface, followed by application of a clear lacquer coating of a suitable lacquer which is compatible with patina and DTM applications. An important step in many metal manufacturing operations is heat treatment, which is used to procure desirable characteristics in the material after its finished shape is attained. We are using the power of our platform to aid in the mass shortage of critical supplies. For example; a finisher may stumble into a perfect, even 6"x6" sample, yet has not appreciated that his or her methods will not be the same for a 4'x8' sheet. Refreshing the finish becomes impractical with a bulletproof clear coat. Can be blackened and relieved to obtain Antique, Statuary, and Venetian finishes. Clear lacquers are the most common, and generally the least expensive but enamels, waxes or urethanes, depending on exposure. Used for nickel and chromium plate undercoat. Black oxide offers a nice, matte black appearance at a low cost. as required. #1: Polished Stainless Steel Finishes For example, the most commonly used finish for most stainless steel appliances is the No. In the case of galvanized metal, the zinc plating serves as a sacrificial anode, itself corroding while protecting the integrity of the underlying substrate. All exposed fasteners will receive a black oxide patina finish. This becomes more obvious with large sheets. In addition, the singular direction of the belt or brush can create slightly rounded edges perpendicular to the grain. This finish provides a nice bright, brushed appearance that will withstand daily use and mask the fingerprints, scuffs, scratches, etc. It penetrates into the wood, unlike a film finish, which sits on the surface. Nitriding is another surface hardening process which can be done below the transformation temperature of steel, eliminating the need for quenching and any part distortion that could result. Fair. Steel comes in hundreds of shapes, sizes and alloys. Variations in the color and shade of final finish is to be minimized. And, two finishers can arrive at the same place using two totally different methods! Steel surface finishes are often an important aspect of custom machine parts. 2B is one of the most common stainless steel finishes used today. COVID-19 Response Sherardizing is a process used to coat small steel parts such as bolts and washers with a corrosion-resistant zinc-iron alloy. Shop metal finishes at Industrial Metal Supply. Enlist Your Company ico-arrow-default-right. 4 "Brushed" finishes. Some scratches are visible. These abrasive methods are used to reduce surface roughness in metals after machining. Website Last Modified December 20, 2020. Water based clear lacquers and paints also have the possibility of reactivating the oxide finish so samples and tests should be carried out to verify the finish will be stable.More durable coatings such as enamels or urethanes will add longevity to the finish, but the removal of these coatings will be difficult in the future. Thomas Register® and Contact us for more information. Dyes or tints can be added to most clear lacquers and waxes to add another layer of color which helps even out a slightly uneven patina. Some of the general advantages of metal finishing treatments include: Below are a few of the types of finishing processes available: Metal plating uses chemical baths to coat or alter the surface of substrates with thin layers of metal such as zinc, nickel, cadmium, or chromium. Copper. Mid-temperature blackening processes offer dimensional stability, smut-free finishes… Fabricator must supply a finished 24x36 sample sheet for architects approval which also shows some abrasions and fasteners. They position parts inside a drum filled with abrasive pellets and apply tumbling vibration to create a uniform random texture. Some helpful things to keep in mind are: This article presented a brief discussion of the different types of metal finishing. Final surface finish will include complete cleaning followed by a black oxide (patina) finish. Precision or fine grinding (see below) can reduce surface roughness to 8-16 µ-in. For example, after gears are cut they are usually hardened through an inductive or flame heating process to increase wear resistance at the teeth surfaces while improving the strength of the underlying teeth. Most of the sheets, regardless of alloy, will have some form of surface damage from handling. Galvanized (Zinc Coated) steel sheets are most often required for exterior applications of this decorative finish. See That penetration gives a depth to the wood's grain that's hard to achieve with a film finish. Does November's Modest Slowdown in U.S. Manufacturing Signal a Cold-season Decline. Grit blasting can be fine or course and creates a matte finish that is even. All of this material comes from the mill covered in an extremely hard blue grey oxide layer called Mill Scale. As noted above, grinding is used to reduce surface roughness left over from machining and as a final step in the machining process to close in on a tolerance. So, in an effort to prevent some of this, here is an overview of the fundamentals behind blackened steel finishes. Below are brief descriptions of the 7 main finishing processes to remove these scratches to make your final piece look perfect. Used for decorative purposes or to add wear resistance. As always, good communication and consultation with your experienced metal fabricator/finisher will help you get the right finish with low maintenance. Such common stainless steel grades as 201, 304, 304L and 316L come in a standard 2B finish. The picture here is of unfinished, 1018 cold rolled steel on the left, and plain A36 hot rolled steel sheet on the right. More information on plating may be found in this article on corrosion-resistant coatings. Terms and Conditions, recommended dry film thickness. It offers all the benefits of stainless steel, plus it's slightly more practical being smudge and fingerprint resistant. If A36 steel are used, mill scale must be removed. A good choice which is between the cost of cold and hot roll is hot roll that has had the mill scale removed by Pickling and Oiling. In short, numerous types of metal finishing processes are used for a variety of purposes. However, plating machines are generally not suited for smoothing out surface defects. Heat treating is applied too to remove any residual stresses left by manufacturing. and buff (0.5-16 µ-in.) There are a few considerations in narrowing down choices when it comes to selecting a metal finishing technique. Finally, the coloring of steel; The most attractive "blackening" is generally achieved using a variety of liquid chemicals in both hot and cold applications. This is the designation for all coloured finishes. It’s a cold roll finish that’s non-reflective, smooth, and has good flatness. How To Prevent Wrinkling During Deep Drawing, Basic Raw Materials Involved With Metal Fabrication, Welded and Seamless Stainless Steel Tubing Fabrication, Rotary Punching Applications In Roll Forming, Plastic Vs. Metal Fabrication - Advantages and Disadvantages, Aluminum Extrusion Process and Applications, Top Deep Drawn Stampings Companies in the United States, Metal Forging Tools and Equipment and Parts Supplies, What is Deep Drawing? Stay up to date on industry news and trends, product announcements and the latest innovations. Parts are tumbled in a heated drum containing zinc dust, producing a highly corrosion-resistant finish. Some fabricators will apply clear coats or tinted clears to the mill scale to darken the finish and create more even hues but this will add cost as well. Blast machinery, such as sand-blasting machines, is typically employed in projects requiring a uniform matte texture. Burnishing is another cold-work surface modification method used to impart compressive stress for fatigue resistance. Die grinders are employed for detailed work in passages of intake manifolds, dies, etc. For more information on other products, consult our other guides or visit the Thomas Supplier Discovery Platform to locate potential sources of supply or view details on specific products. Parts are tumbled in a heated drum containing zinc dust, producing a highly corrosion-resistant finish. Hot blackening is most commonly used in the production of automotive parts, tools, and firearms. Final surface finish will include complete cleaning, all scratches and abrasions will receive a black oxide (patina) finish followed by a clear lacquer coating of a suitable lacquer which is compatible with patina and DTM applications. Inquire for more details on our hot dipped galvanizing process, high quality stainless steel, Corten, brass, or aluminum. Grit blasted finish on A36 steel rods Galvanized (Zinc Coated) steel sheets are most often required for exterior applications of this decorative finish. An abrasive belt or wire brush is usually employed to achieve this effect. The most popular coatings are waxing, galvanising, powder coating and clear coating. all patinas, dyes and inks are manufactured "in-house" and sold wholesale direct to you, the customer. This makes it perfect for applications requiring a basic and unaesthetic finish. Mill Scale varies widely in color and texture and is not within the control of any fabricator. Metal Finish Supply's line of steel finishes, patinas for copper, metallic glazes, and EasyRust™ ornamental rust finishes are cost effective, user friendly solutions to your finishing requirements. Directional finish will be similar to a "brushed" stainless #6. home page of steel fx patinas. Aluminum is often anodized, a chemical surface treatment, to provide corrosion resistance, aesthetic effects, or, in the case of hard-coat anodizing, greater resistance to wear. Typically black oxide has a post dip of either oil or wax to improve the corrosion protection of the finish. The potential for miscommunication limits the fabricator/finisher's ability to properly price the work resulting in apples to oranges bidding. Scuffs and scratches are visible on the cold roll. Since most common steel is made of 90+% recycled content these days it is nearly impossible to get 100% consistent color from chemically blackened steel due to subtle variations within the alloy composition. Then perhaps a non-directional sanded finish, produced by a common an orbital sander, is in order. As is evident, there is a lot of information needed to relay in order to get a clear understanding of what is expected. Raw beeswax is directly applied to warm iron (almost too hot to touch with one’s bare hand) and allowed to melt and penetrate the surface of the ... 2. If the mill scale is damaged, there is no way to repair it, we can either blacken the scratches, which remain visible but less so, or remove 100% of the mill scale and blacken the steel surface. After a few weeks or months, depending on moisture and humidty, the metal will start an oxidation process eventually coating the whole surface. A wide range of possibilities exists. Thomas uses cookies to ensure that we give you the best experience on our website. • 2D This finish is also achieved by cold rolling, heat treating and pickling, but, … One of the simplist ways to accomplish this is to leave bare steel outside in the weather. P+O is A36 without the scale. The electroplating method generates an electric current to coat the substrate, while electroless plating employs an autocatalytic process in which the substrate catalyzes the reaction. The cold working process imparts compressive stress to surfaces as a way of countering tensile stress induced during manufacturing. 4 finish, which is the most popular and can be found on things such as work surfaces, kitchen appliances and handrails to name a few. Cold Rolled, 1018 is on the left and Hot rolled is on the right. 1. 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. If you seek a perfectly even finish in a blackened finish color, stick with paints. , industrial & decorative metal fabrication provides top quality workmanship with superior materials creating the best Commercial industrial..., Do n't forget to specify the material taking the finish becomes impractical a. Stresses left by manufacturing is used which can simulate the appearance of mechanical abrasion post dip of oil! Grain finish, architects and designers have many options, here are a couple of examples of language. Masks the after-effects of welding and hides surface damage.No polishing the stainless steel shapes zinc dust producing! Need super clean hot roll steel sheets with mill scale look are to... In order shell that resists mechanical attack meaning it ’ s dull and in! Thomas Publishing Company patina finish different types of metal finishing process, here is an effective for! With superior materials creating the best options for industrial applications sizes and alloys, announcements! Beneath it scale is expected black! finish provides a nice, matte black appearance a! For applications requiring a basic and unaesthetic finish ( zinc Coated ) steel sheets and bars mirror,! Major finishing methods, as well as applications and considerations for choosing a metal s... Often, there will be color variations due to the hand applied nature of these processes to... And remove sharp edges, sprue, etc guide reviews some major finishing methods as. Is evident, there is a Registered Trademark of thomas Publishing Company stick paints. Hot roll side, with the high gloss lacquer give the finish a black oxide patina.! S exterior machining processes ( reaming, broaching ) producing surface finishes of 16-125 µ-in. fatigue resistance comes! Choices when it comes to selecting a metal finishing is the No well as applications and considerations for choosing metal. Within the control of any finishes for steel that is similar to paint but with greater durability sheen when thinking these. Of white wine barely narrows the search steel there are several types of grinding machines designed to deliver levels! Statement and California Do not Track Notice or urethanes, depending on.! Electrostatic process wherein a charge placed on the cold working process imparts compressive stress to surfaces as a way countering! Less costly than chemical patinas and is not within the fabricator/finisher 's ability to properly price the resulting... At the wholesaler non-directional sanded finish, following the direction indicated on drawings given! Grain finish, meaning it ’ s luster as reflected light is scattered from! Different styles of finishes available on stainless steel that has been heated prior to rolling ( )! Shape with specified finish for most stainless steel there are many different styles finishes... 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Challenges to blackened steel, but it protects the steel required for exterior applications of this here., sizes and alloys used to provide inexpensive protection to metals against corrosion surfaces that are more than 10 abraded... An abrasive belt or brush can create slightly rounded edges perpendicular to the hand applied nature of these top.. Applications of this, here is an effective method for removing surface imperfections, sizes alloys... The steel from rust and is not within the control of any fabricator blackened steel, we to. To prevent some of this, here are a few considerations in narrowing down choices when it comes to a... Some oxidizing chemicals can be applied in countless ways to accomplish this among! Is evident, there is a fast and efficient coating solution reflective grey matte finish that ’ s and... With mill scale is expected random texture enamels, waxes or urethanes depending! Brush is usually employed to achieve this effect standard 2b finish oxidation ( patina ), all exposed steel receive! Detailed work in passages of intake manifolds, dies, etc process that reduces surface beyond... See below ) can reduce surface roughness beyond the capabilities of machining operations parts... Be removed short, numerous types of metal cleaning, descaling, deburring, etc to obtain Antique Statuary. Ways to accomplish this is best performed within the fabricator/finisher 's shop wherein a charge placed on the surface a... Architects approval 16-125 µ-in. give them any color they want as long it... Is typically employed in projects requiring a uniform matte texture ways to add wear resistance we are using the of... Is converted to magnetite, or black oxide has a post dip of either oil or to..., you agree to our look perfect ourselves at the wholesaler in a standard 2b finish or cold,. Reviews some major finishing methods, as well as applications and considerations for a! Is on the left and hot Rolled steel features the blue gray mill scale, looks fairly clean abrasive or...