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Hot-Rolled Steel |
Dongbu Steel is one of the three major integrated steel makers in Korea. The company has manufactured various steel products including cold and hot rolled plates, structural steels and steel pipes since its inauguration in 1967. Starting in 2009, with the completion of its electric arc furnace mill, the steel maker has been operating innovative, eco-friendly production facilities thanks to the new mill that uses scrap metals as basic raw materials. The company is committed to supplying custom-tailored products in a timely manner, as well as expanding its overall product portfolio to include high value items such as automotive steel sheets to offer customers greater value.
■ Product Type
Hot-rolled coils, Hot-rolled sheet, Checkered plate, etc.
■ Applications
· Cold-rolled steel: Used for cold-rolled steel, galvanized steel, pre-coated metal, etc.
· Steel pipe: Used for structural steel pipes and specialty steel pipes
· Hot-rolled mild steel: Used for channels (C-shaped cross section), general-purpose steel pipes, etc.
· Structural steel: General-purpose and welding sheets used for steel structures, bridges, vessels and automobiles
· Oil well tubing & pipeline steel: Used for line pipes, submarine oil field drilling and oil production and products requiring high tensile strength, cryogenic toughness, or welding
· Checkered plate: Used for industrial purposes including construction sites and parking lots to cover the floor
· Automotive steel sheet: Used for auto frame, wheels, etc. for its high strength, good drawing operation and welding-improving quality
· Atmospheric corrosion-resistant steel: Combined phosphorus, copper, nickel and other additional elements to ensure greater atmospheric and corrosive resistance, often used for containers, special vehicles and construction
· Specialty steel (carbon steel for machine structural use, alloy steel, tool steel, etc.): Manufactured via a series of processes including heat treatment; used for producing various mechanical parts
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Cold-rolled Steel |
Cold-rolled steel is manufactured by a process wherein sheet metal is placed between a pair of rollers and then compressed and squeezed to produce the required thickness. The resulting steel product thus has a good surface finish and excellent mechanical properties and is widely used as a basic material for automobiles, consumer electronic products, furniture, construction materials and office supplies. After compressing and squeezing, cold-rolled steel is subjected to various processes depending on its utility, such as zinc or electric coating and color coating which applies paints on the surface of the steel. Cold-rolled steel is categorized roughly into coils (long, uncut steel) and sheets that are cut and then folded into shape in multiple layers.
■ Product Type
· Regular sheet/sheet with BA (bright annealing): A high value product with good surface finishing characteristics and workability; widely used for automobiles, consumer electronics products, mechanical parts, accessories, stationery, etc.
· Inner magnetic shield: Developed and manufactured by Dongbu Steel for the first time in Korea; used for monitors and TV sets to ensure magnetic shielding and high-quality video
· Hi-Carbon: A high-strength product used for automotive parts, knives, tape measures, etc.
· Mill Clean (off-gauge cold rolled steel): Steel sheets with thickness of 2.3 mm or above
· Sunboss (Cold-rolled steel with one of its sides treated with sheet metal embossing): Gives a soft feel when touched and offers anti-fingerprint properties; used effectively for home electronics products and furniture that come into frequent contact with hand and fingerprint
■ Applications: Chassis, CRT television sets and computer monitors, refrigerator and air conditioner parts, luxury mirrors, etc.
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Galvanized Steel |
One of the most frequently used surface-treated steel sheets, galvanized steel is a cold- rolled steel plate coated in zinc, with good corrosion-resistant properties. Depending on the type of manufacturing process involved, the steel is divided roughly into hot-dipped galvanized steel and electrolytic galvanized steel categories. Due to its long-term resistance to corrosion caused by sun and rain, the steel is widely used for interior and exterior materials in construction projects, as well as for automotive parts and consumer electronics products. In addition, galvanized steel is the most commonly used material to produce pre-coated metal which is one of the most favored construction materials.
Electrolytic galvanized steel is manufactured by subjecting cold-rolled steel to the deposition of a thin, fine zinc coating by en electrolytic process to help improve corrosion resistance. Compared to hot-dipped galvanized steel, electrolytically-processed steel has better overall surface roughness, greater retention of cold-rolled steel properties and higher workability. It also excels in coating quality and corrosion resistance due to the relatively small amount of zinc deposited and the more consistent and dense rendering of coating.
■ Product Type
· Hot-dipped galvanized steel (GI): Manufactured via the cutting-edge continuous galvanization; features fine, high-quality surface finish
· Galvanized (Fe-Zn) steel (GA): Produced by hot-dipping the steel sheets in a molten zinc-and-aluminum bath to create a Fe-Zn inter-metallic layer which increases welding and coating quality
· Hot-dipped aluminum-coated steel (ALCOT): Cold-rolled sheets coated in aluminum to ensure greater thermal resistance and heat reflection (developed and manufactured by Dongbu Steel for the first time in Korea)
· Super Galum: Dongbu Steel’s proprietary product, this cold-rolled steel is coated in a bath of aluminum (55%) and zinc (45%) that increases corrosion-resistant properties and has high applicability for home electronics products and exterior construction materials, etc.
· Chrome-fee anti-fingerprint zinc coated steel (AFP-GI): A high-end galvanized product with its surface coated organically (1 - 2 μm) to improve durability as well as lubrication anti-fingerprint quality
· Electro-galvanized steel (EGI): A cold-rolled steel widely used as interior and exterior materials for home electronics products thanks to its dense coating quality and fine exterior quality and workability; complies with hazardous substance guidelines (RoHS for home electronics products; EU ELV Directive for automobiles) (Dongbu Steel became the first Korean company to independently develop production facilities for 0.2 mm-thick sheets)
■ Applications: Automotive materials (interior and exterior), CRT TV bands, general construction materials (roof, wall), refrigerator and washer parts, interior and exterior plates for automobiles and home electronics products
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Pre-coated Metal |
A pre-coated metal has the highest value among all cold-rolled steel products. Produced by printing or baking paints onto the surface of cold-rolled steel or GI or ALCOT sheets, pre-coated metal features a wide range of colors and patterns which are commonly used to make the exterior of buildings and consumer electronics products look more polished and sophisticated. Depending on the specific utility of each product, a vast variety of features are available including pollution resistance and anti-bacterial quality.
■ Product Type
· Polyester/silicon coated steel: Has excellent weather resistance; widely used as a dry material
· Sun Clean: A steel sheet with outstanding pollution resistance
· Hi-Polymer (Hi-Polymer polyester coated steel): Used for deep drawing process that requires particularly high flexibility, as well as consumer electronics products including refrigerators, VCR’s, microwave ovens
· Suntek: A pre-coated steel sheet with excellent workability and weather resistance
· Printech: Features fine patterns and colors via gravure offset printing; used as a dry material as well as raw material for manufacturing home electronics products
· Laminated steel: A product coated with a film that features a vast diversity of fine colors and patterns
· PVDF/Sun Dura: A PVDF (specialty plastic material) coated steel sheet with ultra weather-resistance and superb anti-corrosion properties, which is Dongbu Steel’s proprietary product and is used as a building exterior material
· Emboss: A high-end pre-coated steel plate treated with embossing process to give 3-D quality
· Green Board: A pre-coated steel sheet used in the construction of bulletin boards
· Static-eliminated steel: A pre-coated sheet with anti-dust properties as well as anti-static and fireproof properties, which is used for clean rooms
· Anti-bacterial steel: A multi-functional sheet coated with a film that contains silver nanoparticles known for their anti-bacterial, sterilizing and odor-resistant properties, which is also capable of protecting against UV rays and electromagnetic radiation and ensuring electric static elimination and insulation
· Al-Color/Super Galum Color: An aluminum sheet or aluminum-zinc (55% vs. 45%) sheet (Super Galum) coated with a film of resin that varies widely with customer specification
· Sun Stone: A revolutionary pre-coated metal with unique surface finish brought out by a special coating method
· Sun Luce: A pre-coated metal with vivid 3-D patterns
■ Applications: Consumer electronic product bodies (refrigerator, air conditioner, etc.), construction panels, doors, shelters, etc.
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Tin Plate |
A tin plate (TP) is a thin black plate of 0.14 - 0.6 mm in thickness that is coated in tin via electrolysis. With a good surface shine, fine corrosion resistance and workability, TP is widely used for manufacturing food and beverage containers, electronic parts, etc. Dongbu Steel supplies a number of local and international boiler makers its tin plate (TP) and tin free steel (TFS) with vast diversity and outstanding quality. The clients utilize TP and TFS for a wide range of products including 3-piece cans, 2-piece (D&I, DRD) cans, can ends, steel EOE’s (easy open ends), toys and electronic parts. The steelmaker also manufactures ultra-thin TP (a high value product) that enables the manufacture of lighter containers.
■ Product Type
· SR (single reduced) and DR (double reduced) TP: DR TP is a thin cold-rolled steel that was reduced twice to ensure higher strength. The strength of the material, which contradicts its thinness, enables many can manufacturers to produce lighter products with cost-saving benefits.
· TFS (tin free steel): Also known as electrolytic chromium coated steel (ECCS), TFS has similar properties as TP, but is cheaper. Its cost-competitiveness as well as outstanding paint adherence and corrosion resistance has made it a popular alternative to TP.
■ Applications: Beverage cans, food cans, oil cans, paint cans, aerosol cans, butane cans, bottle caps, fancy products, fiber optic cable protectors, electronic parts, industrial containers, etc.
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Steel Pipe |
Putting its 50-odd years of experience and know-how to work, Dongbu Steel is the leading steel piping manufacturer in Korea. The company manufacturers a vast diversity of steel pipes via electric resistance welding (ERW) and spiral pipe welding. Product types include standard steel pipes; structural pipes for construction purposes; pipes for general purposes and pressure service; oil pipelines; and oil well drill pipes. The steelmaker is dedicated to offering first-tier products to customers and to that end, implements its own comprehensive quality certification system as well as complying with various local and overseas certification programs. Dongbu Steel’s production and sales of API (American Petroleum Institute) specification pipes, which require particularly high quality rendering, is well received by both local and international markets.
■ Applications: Structural tubes for piping, oil pipelines, bridges, harbor facilities, steel towers and utility poles; steel pipe piles used for the foundation work of civil structures, buildings, etc.
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Light Welded H Beam |
As the first Korean steelmaker ever to produce welded beams via electric resistance welding (ERW), Dongbu Steel has led the local steel beam market over the past 30 years with its accumulated technology and expertise. Compared to generic rolled beams, Dongbu Steel’s welded beams have greater cost-effectiveness and world-acclaimed quality. And the company ensures its products come with solid customer support and services. Its product portfolio includes asymmetric flanges with varying widths and thicknesses for tops and bottoms; beams with circular eccentric web holes; t beams (truss beams); smaller, thinner H-beams. Dongbu Steel beams come in various sizes, shapes and materials, which cannot be matched by the competitors’ generic beams.
■ Applications: Roofing, structures, containers, trailers, glass greenhouses, mechanical device supports, piles installed in temporary structures, etc.
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PEB (Pre-Engineered Metal Building Solution) |
PEB, a fine example of Dongbu Steel’s advanced steelwork and building technology, offers a cutting-edge integrated design program that implements and monitors the entire process from spatial planning to material design to production. The solution excels in economic feasibility and spatial usability. It helps create a perfectly customized space utilizing Dongbu Steel’s flawless structural analysis process, automated production line, first-notch technical power and quality and one-of-a-kind services.
■ Applications: Factories, warehouses, large logistics centers, buildings requiring a column-less space, gymnasiums, hangars, etc.
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Steel Structure |
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Structural steel for general purposes is widely used for small and medium-height buildings as well as high-rise buildings. Dongbu Steel is capable of delivering optimal designs via advanced engineering and technical power and ensures error-proof, fast processing using state-of-the-art machinery and equipment.
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BH Beam (Built-Up H Beam) |
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With BH beams, Dongbu Steel not only manufactures customized sizes but also proposes optimal ones based on the structural analysis and calculation by its seasoned engineers. The company offers more than just manufacturing and product delivery, but also proposes and produces the products that best accommodate individual customer needs.
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