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High-Quality Hot Rolled and Cold Rolled Steel Coils from China Suppliers and Factory for Versatile Applications

Steel coil, a flat-rolled steel product manufactured by winding continuous strips into large rolls, is essential for various industries. Our China-based factory produces high-quality steel coils using advanced hot rolling and cold rolling processes to meet specific requirements. As reliable suppliers, we offer a diverse range of steel coils with varying thickness, width, and mechanical properties, making them suitable for applications from heavy construction to precision manufacturing. Trust our expertise for all your steel coil needs and experience the benefits of using premium materials sourced directly from our factory in China

Product Details

Specifications

Parameter	Range / Options
Thickness	Hot Rolled: 1.2 mm – 25.4 mm Cold Rolled: 0.15 mm – 4.0 mm Galvanized: 0.2 mm – 3.2 mm
Width	600 mm – 1,880 mm (standard ranges)
Coil Weight	3 – 25 metric tons (typical)
Inner Diameter	508 mm / 610 mm (standard)
Surface	Mill finish, pickled & oiled, galvanized, coated

Types of Steel Coil

Type	Manufacturing Process	Characteristics	Typical Thickness
Hot Rolled Coil (HRC)	Rolled above recrystallization temperature (1,000°C+)	Rough, bluish-gray surface; scaled finish; lower cost; good formability	1.2 – 25.4 mm
Cold Rolled Coil (CRC)	Hot rolled coil further processed at room temperature	Smooth, shiny surface; tighter tolerances; increased strength; improved appearance	0.15 – 4.0 mm
Galvanized Steel Coil (GI)	Zinc coating applied via hot-dip process	Corrosion-resistant; spangled or spangle-free finish; extended service life	0.2 – 3.2 mm
Galvalume / Aluzinc Coil	Aluminum-zinc alloy coating (55% Al, 43.5% Zn)	Superior corrosion resistance; better heat reflection; cut-edge protection	0.2 – 2.5 mm
Prepainted / Color Coated Coil (PPGI)	Galvanized substrate with paint application	Decorative colors; enhanced durability; coil coating process	0.2 – 1.5 mm
Pickled & Oiled Coil (P&O)	Hot rolled with surface scale removed via acid bath	Clean surface; oiled for temporary rust protection; ready for further processing	1.5 – 6.0 mm

Manufacturing Process

1

Raw Material Preparation

Steel coil production begins with high-quality raw materials—iron ore, coal, and limestone—which are melted in blast furnaces to produce molten steel. Continuous casting forms the liquid steel into slabs, which are then prepared for rolling.
2

Hot Rolling

Steel slabs are heated above recrystallization temperature (approximately 1,000°C) and passed through large rollers that reduce thickness and stretch the material into long sheets. This process yields hot rolled coils with characteristic scaled surfaces.
3

Pickling

Hot rolled coils may undergo pickling in hydrochloric acid tanks to remove surface oxides (scale) formed during hot rolling. This operation ensures surface quality for subsequent cold rolling or direct use. The process includes trimming edges and applying oil for temporary protection.
4

Cold Rolling

Pickled hot rolled coils are further processed at room temperature through tandem rolling mills. The combined action of loads and pulls reduces thickness while improving surface finish, flatness, and mechanical properties.
5

Annealing

Cold rolled coils may receive heat treatment to relieve internal stresses and restore ductility lost during cold working.
6

Galvanizing

For corrosion-resistant products, coils pass through continuous hot-dip galvanizing lines using the Sendzimir process. The strip immerses in molten zinc with small aluminum additions to improve adhesion and flexibility.
7

Coating / Painting

Coil coating lines apply paint via rollers, followed by heat treatment to polymerize coatings. The process includes degreasing, chemical pre-treatment, primer application, top coat finishing, and quality control testing.

Frequently Asked Questions

Q What is the difference between hot rolled and cold rolled steel coil?

Hot rolled coil (HRC) is produced by rolling steel above its recrystallization temperature (~1,000°C), resulting in a rough, scaled surface and thicker gauges (1.2–25.4 mm). Cold rolled coil (CRC) is processed at room temperature from hot rolled material, producing a smoother, shinier surface with tighter dimensional tolerances and thinner gauges (0.15–4.0 mm). CRC generally offers higher strength and better aesthetics, while HRC is more cost-effective for structural applications.

Q What are the standard coil dimensions available?

Standard steel coil widths range from 600 mm to 1,880 mm, with thickness varying by product type: hot rolled (1.2–25.4 mm), cold rolled (0.15–4.0 mm), and galvanized (0.2–3.2 mm). Coil weights typically range from 3 to 25 metric tons, and inner diameters are standardized at 508 mm or 610 mm. Custom dimensions can often be arranged based on specific project requirements.

Q What is the advantage of galvanized steel coil over regular steel coil?

Galvanized steel coil features a zinc coating applied through a hot-dip process, which provides excellent corrosion resistance by acting as both a physical barrier and a sacrificial anode. This significantly extends the service life of the steel, especially in outdoor or humid environments. Galvalume (aluminum-zinc alloy coating) offers even superior corrosion resistance along with better heat reflection and cut-edge protection compared to standard galvanized coil.

Q What is PPGI and where is it commonly used?

PPGI stands for Prepainted Galvanized Iron (also called color coated coil). It is produced by applying paint coatings onto a galvanized steel substrate through a coil coating process, followed by heat curing. PPGI is available in a wide range of colors and finishes, offering both decorative appeal and enhanced durability. It is widely used in roofing, wall cladding, home appliances, garage doors, and architectural applications.

Q Why is the pickling process important in steel coil manufacturing?

Pickling removes the iron oxide scale (mill scale) that forms on the surface of hot rolled steel during the rolling process. This is done by passing the coil through hydrochloric acid tanks. A clean, scale-free surface is essential for downstream processes such as cold rolling, galvanizing, or painting, as scale can interfere with coating adhesion and surface quality. After pickling, an oil coating is applied to prevent temporary rust formation during storage and transport.

Q What surface finishes are available for steel coils?

Steel coils are available in a variety of surface finishes to suit different applications: mill finish (as-rolled, with natural scale), pickled & oiled (scale removed, oiled for protection), galvanized (hot-dip zinc coated, spangled or spangle-free), Galvalume/Aluzinc (aluminum-zinc alloy coated), and prepainted/color coated (primer and topcoat applied in decorative colors). The choice of surface finish depends on the intended use, environment, and aesthetic requirements.