Product Types

Carbon Flat Roll

Kloeckner is at the forefront of the North American metals industry when it comes to the breadth and depth of its carbon flat roll inventory.

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Kloeckner uses the latest technology to produce the highest quality sheets, all made to exact customer dimension and tolerance specification. Thanks to our extensive inventory of hot rolled, cold rolled, and coated steel products across North America, we’re able to provide customers with additional value-add services like just-in-time delivery and advanced supply chain management.

Learn More About Each Carbon Flat Roll Grade

General Info for Carbon Flat Roll Products

Carbon flat roll products boast the versatility and durability needed to be widely used across industries.

Kloeckner Metals supplies carbon flat roll achieved through hot or cold roll forming. Furthermore, carbon flat roll products can undergo various treatments to enhance characteristics like corrosion resistance, scratch resistance, and smooth and polished finishing character.

Here’s a breakdown of the different treatment processes:

  • Hot roll forming is a mill process that requires the steel to reach a temperature of at least 1700 degrees Fahrenheit before placing the heated steel between top and bottom rollers. Typically, hot rolled carbon products contain blemished surfaces as a result of the chemical reaction that occurs when heated steel comes into contact with oxygen. These surface oxides deter use for applications requiring clean, smooth, and consistent surface finishing character. Additionally, hot rolled steel can shrink, making it an uncommon choice for projects that require precise dimensions. Some common applications for hot rolled steel include construction, shipbuilding, railroad tracks, and industrial machinery.
  • Hot Rolled Pickled & Oiled (HRPO) is a treatment process that removes the oxide surface layer present on hot rolled steel. Pickling describes exposing the hot rolled steel to an acid bath that neutralizes the oxides. Once dry, an oil is applied to protect the steel from rusting. As a result, HRPO surpasses hot rolled steel in corrosion resistance, as well as taking on a uniform aesthetically pleasant quality. Two other benefits to HRPO is improved ease of welding due to the removal of surface impurities, and formability. Shelving, various tools and machine parts, farming equipment, construction, truck framing, and structural components are all common applications for this carbon flat roll product.
  • Cold Roll forming steel requires more extensive processing than hot rolled steel. Formed at room temperature, cold rolling steel involves high pressure compression rollers and greater margins to achieve consistent thickness and evenness, often achieved at the expense of malleability. Cold rolled steel results in a much more refined appearance, with characteristically smoother surfaces and consistently defined edges beneficial to consumer products like appliances.
  • Galvanization is the process of placing cold rolled steel in a zinc bath. Once the steel is removed from the zinc bath, zinc and oxygen react, bonding zinc to the steel’s exterior. This increases the steels resistance to corrosion. Applications with galvanized steel include transmission poles, wind turbines, solar panels, architectural and ornamental components, and HVAC systems.
  • Galvannealed steel combines galvanizing and annealing steel. Annealing is a heat treatment application that when applied after steel has been galvanized, gives the steel a zinc-iron alloy coating. This dual alloy coating produces a matte surface with greater resistance to scratching and, unlike galvanized steel, offers excellent paint adherence. As a result, galvannealed steel is a good fit for applications that often require paint, like cars, highway signs, and garage doors.
  • Galvalume combines cold rolled steel, aluminum, silicon, and zinc. A protective coating forms through continuous hot-dipped application on both sides of the steel. Galvalume’s toughness, strength, self-mending properties, and improved corrosion resistance surpasses both galvannealed and galvanized steel. Galvalume is most commonly used for building products, especially those prone to extreme weather exposure, including roofs, walls, and trim in commercial and residential buildings among other applications.
  • Prepainted, or coil coated steel is the result of a highly automated painting process prior to fabrication with vast opportunity for color customization. Achieved using large accumulators, cold rolled and galvanized sheet metal uncoils at a set rate. It is degreased, cleaned, treated, sealed, cured, and cooled until a paper-thin coating of paint adheres to the metal’s surface. You’ll see prepainted steel used in metal roofing, the automotive industry, and household appliances.

More Details About Each Carbon Flat Roll Product

  • A1018

    A1018 steel is a general purpose, low carbon steel grade that offers good weldability, machinability, formability, ductility, and toughness. Kloeckner Metals supplies A1018 in hot rolled dry and HRPO formats.

    Already a Kloeckner customer? Shop A1018 on Kloeckner Direct.

  • A1011

    A1011 is a high strength low alloy sheet. It provides improved mechanical properties including better corrosion resistance, formability, and weldability. Common applications with this steel grade include general fabrication projects, agricultural tools, automotive components, steel barrels, and structural parts. Kloeckner Metals supplies A1011 in the hot rolled dry and HRPO formats.

    Already a Kloeckner customer? Shop A1011 on Kloeckner Direct.

  • A653

    A653 is a low-carbon steel that’s easy to machine, form, and weld. This carbon flat roll grade is often fabricated into parts that don’t require high strength. This includes fixture clamps, ornamental works, drip pans, frames, mounts, and spacers. Kloeckner Metals supplies A653 hot dipped galvanized sheets and untreated dry galvannealed formats.

    Already a customer? Shop A653 on Kloeckner Direct.

  • CS-A

    CS Type A is a commercial galvanized cold roll steel with a carbon, phosphorous, manganese, sulphur, and iron chemical composition. Kloeckner Metals supplies CS Type A in cold rolled, galvanized, galvannealed, and galvalume formats.



  • CS-B

    CS Type B is a commercial steel with a carbon, phosphorous, manganese, sulphur, and iron chemical composition. Kloeckner Metals supplies CS Type B in hot rolled dry, HRPO, cold rolled, galvanized, galvannealed, and galvalume formats.

    Already a Kloeckner customer? Shop CS-B on Kloeckner Direct.

  • DS

    Drawing Steel showcases advanced ability to be drawn. It is characterized by less than .05% carbon, making it very soft, easily bent and shaped in the manufacturing process. It is suitable for applications requiring superior drawing capabilities. Kloeckner Metals supplies DS cold rolled, galvanized, and galvannealed.

  • DDS

    Deep Drawing Steel is intended for severe drawing applications. Its drawing capabilities are nearly equivalent to that of aluminum 1100. Kloeckner supplies DDS in galvanized and galvannealed formats.

  • EDDS

    Extra Deep Drawing Steel offers the highest formability and the lowest strength reserved for deep drawing applications. Kloeckner Metals stocks EDDS cold rolled, galvanized, and galvannealed.

  • 33-SD

    Kloeckner Metals supplies 33-SD in cold rolled format.

  • 33-55

    Kloeckner Metals supplies 33-55 in galvanized and galvannealed formats.

  • FS-A

    Kloeckner Metals stocks hot dipped galvanized Forming Steel.

  • G50, G80

    G50 and G80 are double-sided zinc-coated steels commonly used for building products. The amount of zinc coating is measured by the coating weight using the unit ounces per square foot (oz/ft2) and signaled by the numbers 50 and 80. A higher number indicates greater corrosion resistance due to a thicker protective coating. Kloeckner Metals supplies these two grades in galvalume format.

  • G90, G115, G65, G235

    These hot dip galvanized steel grades are intended for applications requiring corrosion resistance and moderate bending and forming capabilities. G90 is growing in popularity in the solar industry.

  • A36

    A36 is a popular general purpose, easy to fabricate steel. It offers good mechanical properties and is a great choice for industrial, commercial, structural applications and general fabrication projects. Kloeckner Metals supplies A36 hot rolled dry.

  • A572-42, 50, 60, 62

    A572 is a high-strength low-alloy (HSLA) steel seen widely across industries including energy, construction, transportation, architectural, and industrial manufacturing. Each of these A572 grades have slight differences in their mechanical properties and chemical compositions. Kloeckner Metals supplies A572 in hot rolled dry and HRPO formats.

  • A871-65

    A871-65 offers improved atmospheric corrosion resistance. Kloeckner Metals supplies this grade in hot rolled dry and HRPO formats.

  • Prepainted

    Prepainted steel is popular across industries for widespread applications including roofs, doorways, and interiors, insulation, automotive, and solar reflective paneling. With nearly an unlimited number of color and texture options, prepainted steel provides superior adhesion and more reliable surface consistency that can be cut, bent, and generally worked without damaging the finished coating. Kloeckner Metals supplies prepainted steel in hot rolled dry, HRPO, cold rolled, galvanized, galvannealed, and galvalume formats.

Frequently Asked Questions

  • What is carbon flat roll?


    Carbon flat roll products undergo a hot or cold rolling process to achieve a flat, rectangular cross section, and are wound into coils with select thicknesses.

    Hot rolling steel occurs while the steel is at 1700 degrees Fahrenheit where the steel is malleable enough to be formed flat. Running the hot steel through compression rollers produces a flat-rolled sheet. Then the steel is wrapped into a coil and left to cool. Blemishes and roughness are common as the steel cools. This simple, highly popular manufacturing method benefits applications where a smooth surface quality remains insignificant.

    Cold rolled steel involves passing room temperature steel through high pressure rollers. Room temperature steel allows fabricators greater control and consistency while rolling. While the cold rolled steel processing is more extensive when compared to hot rolling steel, the main advantages are a more refined surface character and improved durability.

    Once hot or cold rolled, the metal may receive additional treatments to improve surface character, resistance to corrosion, extend longevity, and more.

  • What is hot rolled dry?


    It’s typical for oxides to form on the surface after steel is hot rolled and has cooled. In the hot rolled dry process, the dry steel sheet’s oxide surfaces are removed in an acid bath, then rinsed. Unlike HRPO, rolled dry steel is not oiled after it has been rinsed.

  • What is hot rolled pickled and oiled?


    Hot rolled pickled and oiled steel (HRPO) improves protection against corrosion. Pickling steel refers to an acid bath that removes surface oxides on the steel’s surface. Once this oxide film has been removed from the steel, it is rinsed and finished with an anti-rust protective oil coating.

  • What is cold rolled?


    Cold rolled steel involves passing room temperature steel through high pressure rollers. This allows for greater control and consistency to achieve smooth surface quality and even thickness throughout. However, the processing for cold rolled steel tends to be more extensive when compared to hot rolling steel. The main benefits for cold rolling steel are more refined surface character and improved durability.

  • What is galvanization?


    Galvanized steel refers to cold rolled steel that has been hot-dipped in a zinc bath. Galvanization is the process of exposing metal to a zinc bath.

    Once removed from the bath, the steel, now coated with zinc, chemically reacts to oxygen in the air. This bonds the zinc to the steel and forms a protective, more corrosion-resistant product. Different thicknesses of this protective zinc coating can be achieved, and are included in the conventional naming system for galvanized metal products. The standard guideline equates a heavier coating with higher durability.

  • What does it mean to be galvannealed?


    Galvannealing begins by galvanizing steel. Once galvanized (i.e., placed in a zinc bath), the steel is annealed. Adding this heat treatment results in a zinc-iron alloy coating. The addition of iron hardens the surface, gives it a matte aesthetic, and makes it more scratch resistant than galvanized steel. Galvannealed steel can be painted after the fabrication process. This is one of the main differentiators between galvanized steel and galvannealed steel.

  • What is galvalume?


    Galvalume combines zinc, aluminum, and silicon. This combination forms a high-performing protective layering. Cold-rolled carbon steel sheet gets continuously hot-dipped with aluminum and zinc alloys. Galvalume gives the best characteristics of each metal, surpassing the corrosion resistance of galvanized steel by up to four times. It is especially popular for metals used in outdoor metal roofing, metal paneling, and other metal building products.

  • What does it mean to be pre-painted?


    Pre-painted metal–also referred to as coil coated metal–is an alternative to post-painting metal that produces a higher integrity, more corrosion resistant top coat of nearly any color imaginable. Pre-painted metal is produced by a highly automated process made possible by accumulators. The cold rolled and galvanized sheet metal is uncoiled at a prescribed rate to receive alkaline degreasing, cleaning, treatment, sealing, curing, and cooling until a paper-thin coating of paint has adhered to the metal. Once the final layer has adhered and dried, the metal can be further processed without risk of damaging the painted top coat. Pre-painted steel or aluminum is very common for metal roofing, the automotive industry, and household appliances.

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