Steel Coil
Steel Coil cotal
Steel Coil

Steel Coil

Name: China Steel Coil Manufacturers Suppliers Factory - Customized Steel Coil Made in China - OCTAL Pipe
Brand: OCTAL
SKU: 281162335

Types: Carbon, Stainless, Galvanized, Aluzinc, Hot Rolled, Cold Rolled, PPGI/PPGL
Size Range: Thickness 0.2–25 mm, Width 600–2000 mm, Coil weight 3–30 MT
Standards: ASTM, EN, JIS, DIN, API
Surface & Coatings: Galvanized, Aluzinc, Painted (Color-coated), No.1/2B/BA/Mirror
Key Features: High strength, precise surface, corrosion resistance, customizable
Applications: Pipelines, Shipbuilding, Construction, Automotive, Energy

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Product Introduction

Steel coil is a primary flat steel product used as the starting material for steel plates, pipes, structural components, appliances, and general fabrication. Octal Pipe supplies a broad range of carbon steel coils, stainless steel coils, galvanized (GI/GL) coils, Aluzinc coils, hot rolled coils, cold rolled coils, and color-coated coils (PPGI/PPGL). Products can be supplied to recognized international standards such as ASTM, EN, JIS, and DIN, with the required grade, thickness, width, surface condition, and coating route matched to project and processing requirements.

steel coil surface finish close-up showing texture and quality steel coils stacked by width and thickness classification

Standards and Grades

Our steel coils cover major standards:

Carbon Steel Coil: ASTM A36, A572, Q235, Q345, S235JR, S355JR
Stainless Steel Coil: ASTM A240 (304/304L, 316/316L, 321, 430)
Galvanized / Aluzinc Coils: ASTM A653, EN 10346
Boiler/Pressure Vessel Coil: ASTM A516 Gr.60/65/70
Pipeline Steel Coil: API 5L (X42 – X80)
Shipbuilding Coil: ASTM A131 AH36, DH36, EH36

Manufacturing Process

Steel Coil Types

Steel coils are produced by rolling slabs or billets into continuous sheets and winding them into coils. Depending on production route:

Hot Rolled Coil (HRC): produced above recrystallization temperature, thickness 1.2–25 mm, used for structural and pipe-making applications.
Cold Rolled Coil (CRC): re-rolled HRC at room temperature, thickness 0.2–3 mm, higher dimensional accuracy and surface quality.
Galvanized/Aluzinc Coils: HRC or CRC coated with Zn or Zn-Al alloy for corrosion protection.
Color Coated (PPGI/PPGL): galvanized/galvalume coil further coated with polyester, SMP, or PVDF paint layers.

Key processes include pickling – hot rolling – cold rolling – annealing – galvanizing/aluzinc bath – coating – slitting/cutting.

Manufacturing Process

The steel coil production route varies with the required thickness, surface finish, and corrosion-protection level. The main manufacturing stages are outlined below.

Step	Process	What Happens	Main Purpose
1	Pickling	Surface scale and oxide formed during hot processing are removed with acid treatment.	Prepare a clean steel surface for further rolling or coating.
2	Hot Rolling	Steel slabs are rolled at high temperature into continuous strip and then wound into coils.	Form the base coil and achieve the required general thickness range.
3	Cold Rolling	Hot rolled coil is further rolled at room temperature to reduce thickness.	Improve thickness accuracy, flatness, and surface finish.
4	Annealing	The cold rolled strip is heat treated under controlled conditions.	Restore ductility, relieve internal stress, and improve formability.
5	Galvanizing / Aluzinc Coating	The strip passes through a zinc or zinc-aluminum alloy bath.	Increase corrosion resistance for outdoor or humid-service applications.
6	Color Coating	A paint system such as polyester, SMP, or PVDF is applied over the coated strip.	Add weather resistance, color finish, and extra surface protection.
7	Slitting / Cutting	The finished coil is cut into the required width or length.	Meet project-specific size and delivery requirements.
8	Inspection and Packing	Thickness, width, coating, surface quality, and coil condition are checked before packing.	Ensure the product matches the order and is ready for shipment.

carbon steel coil thickness 0.2–25 mm width 600–2000 mm supply range API 5L pipeline steel coil X42–X80 for line pipe production hot rolled steel coil HRC for pipe making and structural fabrication

Product Range & Specifications

Thickness: 0.2 mm – 25 mm
Width: 600 mm – 2000 mm
Coil Weight: 3 – 30 MT (customized)
Surface Finishes: No.1, 2B, BA, Mirror, Galvanized, Color-coated
Coatings: Zinc 60–275 g/m², Aluzinc 70–200 g/m², Paint film 15–35 μm

Applications

Oil & Gas / Pipeline: API-grade hot rolled coils for pipe manufacturing
Construction: Roofing, wall panels, floor decks, structural steel
Shipbuilding & Offshore: Marine-grade coils (AH36/DH36)
Automotive & Machinery: CRC for car panels, appliances, tubing
Energy & Pressure Vessels: Boiler plate coils for power plants, refineries

Advantages of Octal Pipe Steel Coils

Wide Range: Carbon, stainless, galvanized, aluzinc, PPGI/PPGL
Customizable Specs: Thickness, width, coatings, and surface finish
High Performance: Corrosion resistance, dimensional accuracy, and formability
Global Standards: Conforming to ASTM, EN, JIS, DIN, API
Supply Capability: Large inventory and fast delivery for both standard and project-specific orders

Bullet Summary

Types: Carbon, Stainless, Galvanized, Aluzinc, Hot/Cold Rolled, PPGI/PPGL
Specs: Thickness 0.2–25 mm; Width 600–2000 mm; Coil weight 3–30 MT
Standards: ASTM, EN, JIS, DIN, API
Features: High strength, corrosion resistance, precise surface finish
Applications: Pipeline, Construction, Shipbuilding, Automotive, Energy

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FAQ

01.How do I choose between hot rolled coil and cold rolled coil?

Choose hot rolled coil for thicker gauges, structural use, and general fabrication. Choose cold rolled coil when you need tighter tolerance, smoother surface, and better dimensional consistency. Your current page places HRC at 1.2-25 mm and CRC at 0.2-3 mm, which fits mainstream mill practice.

02.How do I choose between galvanized, Aluzinc, and color-coated coil?

Use galvanized coil for zinc-based corrosion protection, Aluzinc/Galvalume for stronger long-term corrosion performance, and PPGI/PPGL when you also need painted finish and weather-exposed appearance. This follows the common substrate-to-coating logic shown in public coating references and your current page.

03.For galvanized steel coil, what coating standard should I ask for?

Do not ask only for "GI coil." Ask for the standard and coating designation, such as ASTM A653 G30, G60, or G90, because coating mass directly affects service life, price, and downstream processing.

04.Can steel coil be supplied as master coil, slit coil, or cut-to-length sheet?

Yes. Steel coil can be supplied as master coil, slit coil, or cut-to-length sheet, depending on your downstream processing route. Slit coil is more suitable for roll forming and narrow-width fabrication, while cut-to-length sheet is preferred when the project needs fixed sheet size, flatter blanks, or easier workshop handling.