Cold Rolled Coil
Your Premier Cold Rolled Coil Manufacturer
Tianjin KaiDa Import & Export Co., Ltd. is a manufacturer specializing in the production of galvanized steel coils, aluminum-zinc coated coils, and roofing sheets. Our factory has three production lines with an annual output of 500,000 tons. We are also a professional international company engaged in the global sourcing and distribution of high-quality steel products. Our export sales include PPGI, PPGL, hot-dipped galvanized steel pipes, ERW black steel pipes, and other types of steel products.
Customized Services
Tianjin KaiDa Group is committed to providing value to clients — not only through our products but also through customized solutions. We can tailor products according to specific orders, fulfilling all customer requirements with our convenient one-stop service.
On-Time Delivery
With a mature logistics management system and a self-owned freight forwarding company, we ensure that our on-time delivery (OTD) rate reaches 100%.
Quality Certification
We are certified by TUV, SGS, and BV. All production processes strictly comply with international standards such as ASTM A53, BS 1387, JIS G3444, DIN 2440, API 5L, and GB/T 6728 to ensure high product quality.
Excellent After-Sales Service
Upon receiving the products, if you encounter any issues related to quality or packaging, please contact us. We will respond promptly to resolve the problem.
Description
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Commodity |
Steel Cold Rolled Coil |
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Standard |
GB, ASTM,BS, DIN, JIS |
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Width |
914mm, 1000mm,1219mm,1250mm, 1500m |
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Thickness |
0.20mm-2.0mm |
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Grade |
Q195, Q235B, Q215, SGCC,SPCC |
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Coil ID |
508MM / 610MM |
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Minimum Of Quantity |
50 MT |
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Coil Weight |
Around 5 -8 MT |
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Packing |
Wrapped With Waterproof Plastic, Ties Up By Steel Belts |
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Applications |
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Key Benefits of Cold Rolled Steel Coils
Cold rolled steel coils are prized for their many advantages. Here are the key benefits:
Superior Surface Finish
One of the most notable features of cold rolled steel is its smooth and clean surface finish. The cold rolling process helps eliminate imperfections, resulting in a product that has a more polished and attractive appearance compared to hot rolled steel. This makes cold rolled steel ideal for applications where aesthetics are important, such as in appliances or automotive parts.
High Strength and Durability
Cold rolling increases the strength of the steel by refining its internal structure. The result is a steel product with enhanced tensile strength, which can be important for applications requiring materials that can withstand stress and wear. Cold rolled steel is also known for its high resistance to deformation under pressure.
Precise Dimensions
Cold rolled steel coils have very precise thicknesses and dimensions, which are a result of the controlled manufacturing process. This accuracy makes them ideal for industries that require exact specifications, such as in the production of metal parts for machines, buildings, and automotive components.
Enhanced Formability
Although cold rolled steel is harder than hot rolled steel, it is still highly formable, particularly after annealing. This makes cold rolled steel a good option for applications that require complex shapes, such as in metal forming, stamping, and bending processes.
Better Surface Cleanliness and Coating
Cold rolled steel is often treated with a protective coating to further improve its durability and resistance to corrosion. The clean and smooth surface of cold rolled steel makes it easier to apply coatings such as zinc (galvanizing) or other types of protective films, which increase its resistance to rust and wear.
The distinction between hot and cold rolled steel coils
Surface Finish
Hot Rolled: Hot-rolled steel coils have a rougher surface finish due to the scaling that occurs during the heating process. They typically have an oxide layer or mill scale on the surface, which may require additional surface treatments.
Cold Rolled: Cold-rolled steel coils have a smoother and more refined surface finish. The cold rolling process eliminates the mill scale and produces a clean surface that is suitable for various applications without the need for additional treatments.
Mechanical Properties
Hot Rolled: Hot-rolled steel coils have lower strength and hardness compared to cold-rolled steel. They are generally more ductile and have a higher tolerance for deformation.
Cold Rolled: Cold-rolled steel coils exhibit higher strength and hardness due to the strain hardening that occurs during the cold rolling process. They offer improved dimensional accuracy and precise mechanical properties.
Manufacturing Process
Hot Rolled: Hot-rolled steel coils are produced by heating the steel above its recrystallization temperature and passing it through rollers at high temperatures. This process allows for quick shaping and forming of the steel, resulting in larger thicknesses and a scaled surface finish.
Cold Rolled: Cold-rolled steel coils are manufactured by subjecting hot-rolled steel through a cold rolling process. The steel is passed through rollers at room temperature, which compresses and shapes it into thinner gauges. This process provides tighter tolerances, improved surface finish, and higher strength.
Dimensional Tolerance
Hot Rolled: Hot-rolled steel coils have looser dimensional tolerances compared to cold-rolled steel. This is because the steel is shaped and formed at high temperatures, which allows for greater variations in dimensions.
Cold Rolled: Cold-rolled steel coils have tighter dimensional tolerances, ensuring more precise thickness, width, and length measurements. The cold rolling process provides better control over thickness consistency.
Applications
Hot Rolled: Hot-rolled steel coils are commonly used in applications where the emphasis is on shaping and forming, such as structural components, pipes, and railroad tracks.
Cold Rolled: Cold-rolled steel coils are preferred for applications that require precise dimensions, excellent surface finish, and higher strength, such as automotive body panels, appliances, and construction materials.
Common Cold Rolled Steel Standards:
ASTM A1008
Standard for cold rolled carbon steel sheets.
JIS G3141
Japanese standard for cold rolled steel sheets.
EN 10130
European standard for cold-rolled low-carbon steel.
Cold rolled steel is a versatile material used across multiple industries due to its high strength, superior surface finish, and precision.
Automotive Industry:
Engineers utilise this steel material to make car body panels, structural reinforcements, and chassis components.
High-strength variations of this steel make vehicles weigh less without jeopardising their safety performance.
Construction and Infrastructure:
Cold-rolled steel sheets and coils are widely used in roofing, wall panels, and structural components.
The product offers excellent architectural suitability because its uniform shape and outstanding material finish remain outstanding.
Appliance Manufacturing:
Cold-rolled steel sheets are used in refrigerators, washing machines, ovens, and air conditioning units.
The material delivers a uniform surface for painting applications and raises its longevity.
Furniture and Storage Systems:
Cold-rolled steel sheet sizes vary to accommodate furniture manufacturing, filing cabinets, and shelving units.
The material creates a precise finishing surface for contemporary interior applications.
How Are Cold Rolled Steel Coils Made?
The process of making cold rolled steel coils involves several key steps. Here is an overview of the cold rolling process:
Cold Rolling:
The cleaned steel is fed into a series of rollers at room temperature. The rollers reduce the thickness of the steel and elongate it. This step increases the steel's strength by refining its structure. Cold rolling also reduces the steel’s thickness to the desired gauge (thickness), which can range from a few millimeters to over a centimeter.
Steel Preparation:
Initially, steel is produced in a blast furnace or electric arc furnace and then processed into hot rolled coils. These hot rolled coils are then cleaned to remove any impurities such as rust or scale.
Pickling:
In some cases, the cold rolled steel undergoes a pickling process, which involves dipping the steel in acid to remove any oxide layers or surface impurities. This ensures the steel's surface is clean and smooth.
Annealing:
After cold rolling, the steel can be heat treated in a process called annealing, which involves heating the steel to a high temperature and then slowly cooling it. This process relieves internal stresses and softens the steel, making it more formable for later processes like stamping or welding.
Final Processing:
Once the cold rolling and annealing processes are completed, the steel is cut into coils or sheets depending on customer requirements. The final product is wound into coils for easy handling and transport.
Packaging & Shipping
Quality Certificate
FAQ
Tianjin Kaida Import&Export Co.,Ltd is one of the most professional cold rolled coil manufacturers and suppliers in China, specialized in providing high quality products with low price. We warmly welcome you to buy discount cold rolled coil from our factory. For more cheap products, contact us now.
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