JIS G3321 Hot Dipped Galvanized Steel Coil 30–275g/m² Zinc Coating for

JIS G3321 Hot Dipped Galvanized Steel Coil 30–275g/m² Zinc Coating for Construction and Container Manufacturing

１．Product Overview

JIS G3321 hot dipped galvanized steel coil is designed for construction, container manufacturing, machinery fabrication, bridge engineering, and structural applications requiring corrosion resistance and reliable processing performance.

Produced from carbon steel grades such as A36, Q195, Q235, SS400, and SPHC, the product combines the strength of the steel substrate with a protective zinc coating. The galvanized layer helps reduce atmospheric corrosion and extends service life in outdoor and industrial environments.

２．Technical Solution

The steel coil is manufactured through a continuous hot-dip galvanizing process. The steel substrate passes through a molten zinc bath to form a metallurgical coating layer that provides sacrificial corrosion protection.

Regular spangle surfaces are available for traditional galvanized appearance. Passivated, oiled, and anti-finger treatments can be selected according to storage conditions, transportation requirements, and downstream processing needs.

The zinc coating range of 30–275g/m² allows selection according to environmental exposure and service life expectations.

３．Specifications

４．Application

The product is widely used in roofing systems, wall panels, steel structures, containers, machinery components, bridge construction, industrial buildings, warehouses, agricultural facilities, ventilation systems, and fabricated steel products.

It can also be processed into corrugated sheets, galvanized strips, structural profiles, and various cold-formed components.

５．Processing

The coils are suitable for slitting, cut-to-length processing, roll forming, bending, profiling, stamping, punching, and fabrication operations.

Passivated and anti-finger treatments help maintain surface quality during transportation and storage before fabrication.

Standard export packing is designed for containerized and bulk shipment.

６．Advantages

• Hot-dip galvanized coating provides effective corrosion protection for indoor and outdoor applications.
• 30–275g/m² zinc coating options support different environmental conditions and service life requirements.
• 0.18–2.00mm thickness range covers light structural and general fabrication applications.
• Multiple steel grades support forming, welding, and structural processing requirements.
• Regular spangle finish offers a traditional galvanized appearance suitable for construction and industrial use.
• Passivated, oiled, and anti-finger surface treatments improve storage and handling performance.

７．How to Choose

• Choose Q195 or SPHC for applications requiring good formability and cold forming performance.
• Choose Q235, SS400, or A36 for structural applications requiring higher strength.
• Choose higher zinc coating levels for outdoor exposure and humid environments.
• Choose anti-finger treatment when appearance and surface cleanliness are important.
• Choose passivated or oiled surfaces for extended storage and transportation protection.
• Confirm thickness, width, zinc coating, coil weight, and surface treatment before production.

８．FAQ

Q1．What steel grades are available?

A36, Q195, Q235, SS400, and SPHC are available.

Q2．What zinc coating range can be supplied?

The available zinc coating range is 30g/m² to 275g/m².

Q3．What surface treatments are available?

Passivated (chromated), oiled, and anti-finger treatments are available.

Q4．What industries commonly use this product?

Construction, container manufacturing, machinery fabrication, bridge engineering, warehouses, and industrial structures commonly use this product.

Q5．Can customized lengths be supplied?

Yes. The product can be supplied in coil form or processed to customized lengths according to project requirements.