Steel Coil Essentials: Your Comprehensive Reference | CUNMAC Vietnam Icon Icon

Steel Coil Essentials: Your Comprehensive Reference

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Ready to dive deeper into the world of steel coils? Let’s join us on a journey of steel coil discovery with this article now!

  1. What are steel coils?

Steel coils are continuous sheets of steel that are rolled into a cylindrical shape. They are manufactured using two main methods: hot rolling and cold rolling.

Steel coils are often transformed into various shapes and sizes for further processing by 2 common techniques: cutting-to-length and cutting-to-width (slitting).

Steel coils in cylindrical shape

Steel coils in cylindrical shape

Cutting-to-length and Cutting-to-width (slitting) in comparison:

Cutting-to-length: Coils are unwound and cut across straightly into specific-sized pieces for use as steel sheets.

Cutting-to-width (or slitting): Cutting the steel coil lengthwise to create strips that are narrower than the original coil.

Cutting to length and Cutting to width (slitting)

These processes can be made by: mini slitting machine, slitting and cutting to length machine, leveling and cutting to length machine (for thick material)…

Slitting and cutting to length machine

Leveling, slitting and cutting to length machine

Hot Rolled Steel and Cold Rolled Steel in comparison:

Hot Rolled Steel Cold Rolled Steel
– Produced by heating above steel’s recrystallization temperature.

– Having a rougher surface and a larger range of dimensional sizes.

– Most commonly used in construction and manufacturing, particularly when a thicker steel coil is required.

– Lower cost and faster production time make it a popular choice for large-scale projects.

– Processed at room temperature.

– Providing a smoother finished surface and more precise dimensional tolerances.

– Commonly used in applications requiring high precision, such as automotive industry, appliances and electronic components…

Hot rolled steel and Cold rolled steel
Hot rolled steel and Cold rolled steel

Hot rolled steel and Cold rolled steel

  1. What are steel coils made of?

Steel coils are made of various materials, commonly including:

– Carbon steel: the most widely used, affordable, strong, and easy to form, often applied in appliances, building materials.

– Stainless steel: resistant to rust and corrosion, making it ideal for moist or harsh environments.

– Aluminum: not technically steel, lightweight and corrosion-resistant, but has lower strength compared to steel.

Materials of steel coils

  1. Applications of steel coils

Some of their widespread applications:

– Construction: structural beams, roofing sheets, wall panels, floor decks…

– Automotive: car bodies, frames, engine components…

– Appliances: household appliance bodies and other parts.

– Energy: wind turbines, transmission lines, pipelines…

 Applications of steel coils

  1. Steel coil measurements

– Width: Measurement from one edge to the other across the coil’s flat surface. 

– Thickness: How deep the coil is, measurement from one coil surface to the other.

– Inner Diameter (ID): Diameter of the center hole in the coil, crucial for selecting spools and feeding mechanisms in machinery.

– Outer Diameter (OD): Total diameter of the coil, including steel width. Important for storage, transport, and measuring coil length.

Steel coil measurements

  1. How are the coils transported?

Steel coils, due to their weight and size, demand careful handling during transportation. Inside factories or warehouses, cranes and forklifts are used to move them.

Coils are often transported on containers, trucks, trains, or ships for long distances. Due to their cylinder shape, remember to tie down and prevent the coils from rolling during transportation.

Steel coils are transported by container

By using containers to transport coils, remember:

– The steel coil must not touch the container floor.

– Use support like timber or steel beams for the coil.

– Small and narrow coils can be placed close to each other and bound with steel straps or blocked with wood for safety.

– Place coils evenly to balance the container’s center of gravity both lengthwise and widthwise.

– Avoid pressure on side walls.

– Use proper bedding, lashing, and blocking for stability, especially sideways and near the door.

Steel coils demand careful handling during transportation

Steel coils demand careful handling during transportation

Through this post, CUNMAC team has given you steel coil essentials to know. Don’t forget to follow the next issue of our series #defineterms to update more useful information.

This series belongs to CUNMAC Vietnam.CUNMAC Vietnam – Innovative engineering machine manufacturer (OEM), to customize design and provide solutions for roll forming machines to over 30 countries in the world.

Channel roll forming machine of CUNMAC with 2 options:

standard with no safety cover (left) and special with safety cover (right)

Maps cunmac

We customize, design and manufacture a wide range of good solutions and products for companies operating in the sheet metal, construction and manufacturing industries. 

All CUNMAC machines are made in Vietnam. Our goal is to provide made-in-Vietnam flexible machines with good ease of use and high quality, where our designs and solutions give customers unique benefits and experience of our products.

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