Q235 Galvanized Steel Coil

Q235 galvanized steel coil is a common carbon structural steel that complies with the Chinese standard GB/T. It is made from a low-carbon steel base material and treated with a hot-dip galvanizing process. The surface zinc coating provides excellent corrosion resistance and extends service life while maintaining excellent workability and weldability. Available in a variety of specifications and with customizable zinc coatings, it is widely used in building roofing, appliance housings, lightweight steel structures, and automotive applications, offering a highly cost-effective, rust-resistant steel. Wanzhi Steel offers Q235 galvanized steel coil in various widths and thicknesses, along with a comprehensive range of machining options. Please contact us for more information.

Specification

Item	Q235 Galvanized Steel Coil
Place of Origin	Shandong, China
Grade	Q235
Thickness	0.12mm-2mm
Width	600mm-2,000mm
Coil Weight	3-8 tons (can be customized)
Substrate	Hot rolled steel/Cold rolled steel
Surface Structure	Zero spangles, Small spangles, Regular spangles, Big spangles
Technique	Hot Rolled, cold rolled
Zinc Layer Thickness	30g/㎡-275g/㎡ (Z30-Z275/G90)
Standard	AISI, ASTM, BS, GB, JIS
Certificates	ISO 9001, SGS, ABS, BV
Package	Standard export package
Sample	Free Available
Payment term	TT 30% Advance + 70% Balance
Price Item	FOB, CIF, EXW, CFR, etc
MOQ	5 Tons

Note: If you want the width less than 600 mm, you can choose Galvanized steel strip.

Character interpretation

Features

Excellent Mechanical Properties

Yield strength ≥ 235 MPa, combining adequate strength and ductility to meet the strength requirements of most structural components.

Excellent Machinability

Its low carbon content makes it well-suited for subsequent processing such as shearing, stamping, bending, and roll forming.

Economical

Q235 is one of the most common and inexpensive steels, making it a highly cost-effective substrate.

Excellent Corrosion Resistance

The core characteristic of galvanized steel coil is that the zinc layer insulates the steel base and preferentially corrodes when damaged, resulting in a lifespan several times, or even dozens of times, longer than that of ordinary cold-rolled coil.

Aesthetics

The surface features a unique silvery-white spangle pattern, which offers decorative appeal in architectural applications. The coating has strong adhesion and resists peeling.

Flexible Size

Slitting to any desired width using a slitting shear can be performed according to customer needs, or sheet material can be cut to desired length using a cross-cutting shear.

Application Areas

1. Construction and Bridges

Used in lightweight steel keels, color-coated steel tile bases, fence guardrails, air conditioner outdoor unit brackets, bridge beams, piers, and other load-bearing structures, including shear wall connectors, transmission towers, and container racks.

2. Home Appliances and Daily Necessities

Used as base materials for the outer shells and linings of washing machines and refrigerators, as well as raw materials for daily necessities such as trash cans and clothes drying racks.

3. Automotive and Transportation

Used in non-core load-bearing components such as automotive chassis guards, doors, windows, truck bed panels, and bicycle frames, as well as highway guardrails and port lifting equipment.

4. Industrial and Warehousing

Used in the manufacture of storage racks, ventilation ducts, and small and medium-sized machinery and equipment housings. Suitable for mild corrosion environments in industrial environments, it is easy to cut and weld, and can be customized.

5. Machinery Manufacturing

Used in the manufacture of construction machinery bases, agricultural machinery frames, and equipment housings. Suitable for cutting and drilling. Used in components such as gears and bearings that must withstand heavy loads and vibration.

6. Energy and Chemical Industry

Manufacturing of oil and natural gas pipelines and storage tanks, used in the manufacture of chemical equipment such as reactors and heat exchangers.

Production process introduction

This product is made from high-quality Q235 cold-rolled steel sheets using an advanced continuous hot-dip galvanizing line. After pickling and rust removal, followed by reduction annealing, it is dip-galvanized in a zinc bath at approximately 460°C. The zinc layer thickness is precisely controlled using an air knife, followed by a chromate passivation treatment and oiling to ensure excellent rust resistance and surface quality.

The difference between Q235A/B/C/D

The base material (parent material) for Q235 galvanized steel coil can be Q235A, Q235B, Q235C, or Q235D. The main differences lie in the chemical composition (especially the carbon, sulfur, and phosphorus content) and deoxidation method, which directly affect the steel’s mechanical properties and weldability.

Grade	Main Differences	Features and Applications
Q235A	Contains the highest levels of carbon, sulfur, and phosphorus. Only mechanical properties are guaranteed, not chemical composition.	This grade has the lowest quality requirements and is not used for critical welded structures. It also offers the lowest cost. It is commonly used for general structural components.
Q235B	The most commonly used grade. Requires acceptable mechanical properties and guarantees that carbon, sulfur, and phosphorus content are within specified limits.	It offers excellent overall performance (strength, ductility, and weldability) and offers the best value for money. It is one of the most commonly used base materials for galvanized coils.
Q235C	Requires acceptable mechanical properties and has stricter carbon, sulfur, and phosphorus content requirements than Grade B.	It offers higher quality, with low-temperature impact toughness exceeding that of Grade B. It is typically produced from killed steel, resulting in a more uniform material quality. It is used in applications with higher requirements.
Q235D	Requires acceptable mechanical properties and has the strictest requirements for carbon, sulfur, and phosphorus content.	It offers the highest quality, ensuring low-temperature impact toughness. It must be produced from killed steel. It is used for critical welded structures in low-temperature environments (such as those in the extreme cold regions of northern China), and has the highest cost.

Standard Zinc coating information and standards

(1) Zinc coating codes: Z30-Z275 are commonly available. Common zinc coatings include GB/T Z80, Z100, Z180, and Z275, as well as European and American standards G60 and G90. Customization is available upon request.

(2) Spangle Form: Available in standard, small, and smooth finishes to meet diverse application requirements. The smooth, uniform finish is ideal for subsequent spray coating and color coating.

(3) Implementation Standards: Strictly adheres to GB/T 2518-2019.

Processing and precautions

This product has excellent bending, stamping, and welding properties. However, please note the following during processing:

• Welding: Arc welding or gas shielded welding is recommended, and the work area should be well ventilated.
• Bending: A bending radius of at least 1 times the plate thickness is recommended to prevent zinc layer powdering and shedding.
• Storage: Store in a dry environment, away from corrosive media.

Package

Vertical packaging: The most common and standard packaging method.

• Inner packaging: Wrapped with a layer of rust-proof oil paper or vapor-phase rust-inhibiting (VCI) paper to prevent white rust.
• Outer packaging: Sturdy steel corner guards or steel plates are placed on both sides of the steel coil (at the eye).

Horizontal packaging: The steel coil is placed horizontally.

Rust-proof paper, steel strapping, and waterproof cloth are also used. Sometimes, wooden blocks or other supports are placed under the cylindrical surface of the steel coil to prevent rolling.

Q235 galvanized steel coils Manufacturer- Wanzhi Steel

The quality of Q235 galvanized steel coils depends heavily on supplier’s strength. Wanzhi Steel combines superior craftsmanship, rigorous international standards, and reliable after-sales support to deliver consistently excellent products. By choosing Wanzhi, you select both premium quality and lasting peace of mind. We are here to be your trusted partner in success.

Why Choose Us?

1. Fast Delivery: Our large, self-operated warehouse and ample inventory of standard specifications allow us to quickly respond to your urgent needs.

2. Advanced Equipment: Our fully automated continuous galvanizing line, equipped with a precision air knife control system, ensures high-quality zinc coatings.

3. Affordable Prices: Our large-scale production and sophisticated processes ensure competitive pricing and excellent value for money.

4. Quality Assurance: Our strict ISO quality management system ensures comprehensive quality control from raw materials to finished product.

5. Customization Options: We support customization of non-standard dimensions, zinc coating thickness, and surface treatments. Our professional sales and technical teams will quickly provide you with customized solutions.

 

For more product details or to request a free sample, please contact our professional team now.