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Steel coils, also known as coiled steel, is formed by hot-pressing and cold-pressing the steel into a roll shape, which is convenient for storage and transportation and can be used for various processing (such as processing into steel plates and steel belts, etc.)
Steel coil classification：
Hot–rolled steel coils:
Hot-rolled steel coils, using slabs (mainly continuous casting slabs) as raw materials, heated to form strip steel by rough rolling units and finishing rolling units. The hot steel strip from the last rolling mill is cooled to a set temperature by laminar flow and then rolled into a steel strip coil by the coiler.
After cooling, the steel strip coils are processed into steel plates, flat coils, and slitting steel products through different finishing lines (leveling, straightening, cross-cutting or slitting, inspection, weighing, packaging, and marking, etc.) according to various needs of users.
| Production | Hot-rolled steel coils |
|---|---|
| Technical | Hot rolled |
| Width | 1219-1500mm |
| Surface | coated or uncoated |
| Longth | Customer’s Requirement |
| Thickness | 1.2-20mm |
| Weight | 5-28 tons |
| Price | US $520-640/ Ton |
| HS Code | 7208519000 |
| Application | Construction Steel Coil |
Cold–rolled steel coils:
Cold-rolled steel coil refers to a steel strip that is directly rolled into a certain thickness at normal temperature and then rolled into a whole coil with a winder.
Compared with hot-rolled steel coils, cold-rolled steel coils have a brighter surface and higher finish, but they also will generate more internal stress and are often annealed after cold rolling.
| Product | cold rolled steel coil |
|---|---|
| Thickness | 0.3mm-20mm |
| Width | 1000mm,1250mm, 1500mm |
| Length | Customer’s Requirement |
| Technology | Cold rolled |
| Application | belt saws, buzz saws, metal band saws, chain saw guides, music box sound pegs,cutters,diaphragm springs etc. |
| Coil Weight | 3-10MT |
| HS Code | 76061199 |
Galvanized steel coils:
Immerse the thin steel plate in the molten zinc bath to adhere a layer of zinc on its surface. It is mainly produced by the continuous galvanizing process, that is, the coiled steel sheet is continuously immersed in a zinc-melted plating tank to make galvanized steel sheet and alloyed galvanized steel sheet.
This kind of steel plate is also made by the hot-dip method, but it is heated to about 500 ° C immediately after exiting the tank, to form an alloy film of zinc and iron. This kind of galvanized steel coils has good paint adhesion and weldability.
| Product name | Galvanized steel coils |
|---|---|
| Thickness | 0.12-6.0mm |
| Width | 600mm-1500mm |
| (usual size:1000mm,1200mm,1250mm,1500mm) | |
| Coil ID | 508/610mm |
| Zinc weight | 30-600g/m2 |
| Coil weight | 5-8tons |
| Spangle | Mini/regular/big/zero spangle |
| Price | US $ 500-700 /Ton |
| Application | Pre-engineered steel buildings, industrial and commercial roofing and cladding,agricultural buildings, building accessories, light steel framing,construction tubular |
| HS Code | 72104900 |
Galvalume steel coils:
The galvalume steel coils are an aluminum-zinc alloy structure formed by solidification of 55% aluminum, 43% zinc, and 2% silicon at a high temperature of 600 °.
This alloy is composed of dense quaternary crystals formed of aluminum-iron-silicon-zinc.
| Name | Galvalume steel coils |
|---|---|
| Thickness | 0.12mm to 1.50mm |
| Width | 600mm–1500mm |
| Coil weight | 3-8 Tons |
| Coil ID | 508/ 610mm |
| Zinc coating | 30-150g/m2 |
| Length | Customer’s Requirement |
| Coil ID | 508/610 mm |
| Price | $500.00 – $600.00 / Ton |
| HS Code | 7209270000 |
| Application | Industrial panels, roofing and siding for painting |
PPGI steel coils:
PPGI steel coils are the products that use hot-dip galvanized sheet, hot-dip aluminum-zinc sheet, electro-galvanized sheet as based sheets, after surface pretreatment (chemical degreasing and chemical conversion treatment), one or more organic paints are coated on the surface, followed by baking and curing.
It is also named after the color steel coil plate coated with various colors of organic paint, referred to as color coated coil. The color-coated steel belt uses a hot-dip galvanized steel belt as the base material.
In addition to the protection of the zinc layer, the organic coating on the zinc layer also plays a role in covering and protecting, preventing the steel belt from rusting. Its service life is longer than that of the galvanized belt for about 1.5 times.
| Product name | Prepainted Galvanized Steel Coil |
|---|---|
| Material | CGCC, DX51D,Q195,Q235 |
| Zinc | 20-120g |
| Thickness | 0.13-0.8 mm |
| Width | 600-1250 mm |
| HS code | 721070 |
| Coil weight | 3-8tons |
Stainless steel coils:
Stainless steel coils are manufactured by hot rolling stainless steel sheets in a reheat furnace. The hot rolling process is carried out at a certain high temperature.
This temperature is known in the industry as the recrystallization temperature, which is between 1,100 ° C and 1,300 ° C, usually depending on the grade of steel used in the manufacturing process. The steel plate is continuously operated by a heating mill, and then the resulting product is appropriately coiled.
After hot rolling and coiling, the stainless steel coil is annealed and pickled to obtain a softer and brighter surface finish without any oxide layers and impurities.
| Item | stainless steel coils |
|---|---|
| Standard | ASTM GB/T JIS4 ASTM EN. |
| Material | 309S, 316, 316L, 316Ti, 317, 317L, 321, 321H, 347, 347H, 304, 304L, 302, 301, 201, 202, 403, 405, 409, 409L, 410, 410S |
| Technique | Hot Rolled And Cold Rolled. |
| Surface | 2B, 2D, BA, NO. 1, NO. 4, NO. 8, 8K, mirror, checkered, embossed |
| Thickness | 0.1~200mm |
| Width | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm |
Tinplate:
Tinplate is also known as tinned iron. Tin mainly plays a role in preventing corrosion and rust. It combines the strength and formability of steel with the corrosion resistance, tin solderability, and beautiful appearance of tin in one material. It has the characteristics of corrosion resistance, non-toxicity, high strength, and good ductility.
| Name | Tinplate coils |
|---|---|
| Thickness | 0.12 to 0.60mm |
| Width | 20 to 1020 mm |
| Length | 600 to 1200 mm |
| Tin coating | 2.8g/2.8g, 5.6g/5.6g, 2.8/5.6,2.0/2.0 gr/m² or according to customer’s requirement |
| Temper | T2, T2.5, T3, T3.5, T4,T5 ,DR7,DR7M,DR8 BA & CA |
| Annealing | CA(Continuous annealing) and BA(Batch annealing) |
| Surface | Bright/Stone/Silver finish with passivation treatment; DOS oil |
| Price | 5-24 Tons: US $650 25-99 Tons： US $600 100+ Tons： US $520 |
| HS Code | 72101200 |
| Application | food packaging, pharmaceutical packaging, daily necessities packaging, instrument packaging, industrial packaging, etc. |
FAQ:
What does steel coil use for?
Hot-rolled steel coils are used in manufacturing industries such as ships, automobiles, bridges, construction, machinery, and pressure vessels.
Cold rolled steel coils are widely used in automobile manufacturing, electrical products, rolling stock, aviation, precision instruments, food canning, etc.
Galvanized steel coils and galvalume steel coils are used in construction, automobiles, metallurgy, electrical equipment, etc.
PPGI steel coils have lightweight, beautiful appearance and good anti-corrosion performance, and can be directly processed. They are mainly used in the construction industry, home appliance industry, electrical appliance industry, furniture industry, and transportation industry.
Stainless steel coils are mainly used in the automotive industry, home appliance industry, water industry, construction and structural pages, environmental protection, and other fields.
Tinplate is widely used in food packaging, pharmaceutical packaging, daily necessities packaging, instrument packaging, industrial packaging, etc.
Why is cold rolled steel more expensive?
Because cold-rolled steel coils are made of hot-rolled steel coils as raw materials, and the finish of cold-rolled steel coils is higher than that of hot-rolled steel coils.
Steel coil weight calculation:
A steel coil generally weighs 7-8 tons, depending on the thickness and length.
Here is how to calculate the weight of the steel coil:
https://www.steelwarehouse.com/steel-coil-calculators/
https://worthingtonindustries.com/Resources/Tools-and-Calculators
https://www.gasparini.com/en/calculate-length-weight-sheet-metal-coil/
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