Black annealed steel coil refers to a type of steel coil that has undergone an annealing process followed by a black surface treatment. The black annealing process involves heating the steel coil to a specific temperature and holding it at that temperature for a period of time, followed by slow cooling. The purpose of this annealing process is to soften the steel, relieve internal stresses, and improve its ductility and formability.
After the annealing process, the steel coil is subjected to a black surface treatment. This treatment involves applying a black oxide coating or black paint onto the surface of the steel coil. The black surface provides a decorative appearance and also offers some level of corrosion resistance.
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Information
Features
Black annealed steel coils have a black surface finish, giving them a distinct and aesthetic appearance. The black color can provide a decorative and contemporary look, making it suitable for various applications where visual appeal is desired.
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The annealing process in black annealed steel coils enhances the steel’s formability and ductility. This makes it easier to bend, shape, and form the steel into desired configurations without excessive cracking or deformation.
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Black annealed steel coils typically maintain good weldability, allowing for ease of joining using various welding techniques such as arc welding, MIG welding, or spot welding. This facilitates the fabrication and assembly of components or structures.
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While the black surface treatment can provide some level of corrosion resistance, it is important to note that it may not offer the same level of protection as other types of coatings or galvanized steel. Additional measures, such as proper storage and maintenance, may be required to prevent corrosion in certain environments.
Black Annealed Steel Coil Production Process
The black annealed surface of the steel coil can serve as a suitable base for additional painting or coating applications. The black finish provides a good foundation for further surface treatments or decorative finishes.
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It is important to note that the specific features and properties of cold-rolled carbon steel coils may vary depending on the specific grade or composition of the steel used, as well as any additional processing or treatment applied to the coils.
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Technology
Black annealed steel coil is typically manufactured using conventional steelmaking and processing techniques. The special manufacturing technology associated with black annealed steel coil lies primarily in the annealing process and the subsequent black surface treatment. Here are the key steps involved in the manufacturing of black annealed steel coil:
Steelmaking: The first step in manufacturing black annealed steel coil is the production of steel through steelmaking processes such as the basic oxygen furnace (BOF) or electric arc furnace (EAF) method. These processes involve melting scrap or raw iron ore with the addition of alloying elements to achieve the desired composition.
Hot Rolling: After steelmaking, the molten steel is cast into slabs, which are then hot rolled into coils. Hot rolling involves passing the slabs through a series of rolling mills to reduce the thickness and shape the steel into coils.
Annealing: The hot-rolled steel coils are then subjected to an annealing process. Annealing is a heat treatment process that involves heating the steel coils to a specific temperature and holding them at that temperature for a certain period of time. This process helps to soften the steel, relieve internal stresses, and improve its ductility and formability. The annealing process can be carried out in a controlled atmosphere or in a batch annealing furnace.
Slow Cooling: After the annealing process, the black annealed steel coils are slowly cooled either in the annealing furnace or by allowing them to cool naturally in the ambient atmosphere. Slow cooling is essential to prevent rapid temperature changes that could lead to the formation of undesirable phases or excessive hardness.
Black Surface Treatment: Once the steel coils are annealed and cooled, they undergo a black surface treatment. This treatment involves applying a black oxide coating or black paint onto the surface of the steel coils. The black finish enhances the aesthetic appearance of the steel and provides some level of corrosion resistance.
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Application
Black annealed steel coils find various applications across different industries due to their specific properties and appearance. Here are some common applications of black annealed steel coils:
Automotive Components: Black annealed steel coils are used in the manufacturing of automotive components such as brackets, reinforcements, and interior trim. The black finish provides a sleek appearance that complements the overall aesthetic of automotive interiors and exteriors.
Furniture Manufacturing: Black annealed steel coils are popular in the furniture industry for producing frames, supports, and decorative accents. The black finish adds a modern and sophisticated look to furniture pieces, making them visually appealing.
Shelving and Racks: Black annealed steel coils are utilized for manufacturing shelving units and racks in commercial, industrial, and residential settings. The black surface provides a clean and stylish appearance while offering strength and durability.
Wire Products: Black annealed steel coils are processed into wires used in various applications. These include wire mesh, fencing, wire ropes, hangers, and other wire-based products. The black surface treatment enhances the appearance and corrosion resistance of the wires.
Appliances: Black annealed steel coils find use in the production of appliances such as refrigerators, ovens, and washing machines. The black finish adds a sleek and modern touch to the appliances, complementing contemporary design aesthetics.
Decorative Trim: Black annealed steel coils are employed for manufacturing decorative trim elements in architecture and interior design. They are used as edging, accents, and trims in applications such as wall panels, door frames, and furniture detailing.
General Fabrication: Black annealed steel coils are versatile and can be utilized in various general fabrication applications. They are used to fabricate components, brackets, supports, and structural elements in different industries, including construction, manufacturing, and assembly.
Package
carbon steel coils are typically packaged and prepared for shipment or storage using various methods to ensure their protection and ease of handling. Some common packaging methods include:
Coil Packaging: The coils are usually wrapped tightly with steel strapping or plastic straps to secure them and prevent unwinding or damage during transportation. The strapping is applied around the circumference of the coil at regular intervals to hold the coil shape.
Wooden Pallets: The wrapped coils are often placed on wooden pallets to provide stability and facilitate handling with forklifts or pallet jacks. The pallets help distribute the weight evenly and protect the coils from direct contact with the ground or other surfaces.
Stretch Wrapping: The entire pallet containing the coils may be covered with stretch film to provide additional protection against dust, moisture, and physical damage. Stretch wrapping also helps to stabilize the coils and keep them in place during transportation.
Protective Covering: In some cases, the coils may be covered with protective materials, such as plastic or cardboard, to safeguard them from scratches, abrasion, or exposure to the elements. This extra layer of protection helps maintain the quality of the coils.
Identification and Labeling: Each packaged coil is typically labeled with relevant information, including the coil’s specifications, grade, dimensions, weight, and any necessary handling instructions. This labeling ensures proper identification and handling of the coils.
As a full-service carbon steel supplier, we also offer a variety of value-added services to adapt our steel to meet your specifications.Those services include loop-slitting, cut-to-length, pickling, temper passing and stretch leveling, coating, painting and other processes.