Hot Dipped Galvanized Steel Coil & Prepainted Steel Coil - GI / PPGI Manufacturer

Product Overview

 

Hot dipped galvanized steel coil (GI) and prepainted galvanized steel coil (PPGI) are manufactured from high-quality cold rolled substrate through advanced continuous hot-dip galvanizing and coil coating lines.

 

The galvanized layer provides reliable corrosion protection. The prepainted version applies an additional organic coating system over the galvanized substrate, delivering both corrosion resistance and decorative finish.

 

Both product types are available with flexible specifications to suit diverse application requirements across construction, automotive, home appliance and general fabrication industries.

 

Product Specifications

 

Parameter	GI Coil	PPGI Coil
Standard	EN 10346, JIS G3302, ASTM A653	EN 10346, JIS G3322, ASTM A755
Steel Grade	DX51D, DX52D, DX53D, SGC grades	DX51D, DX52D, SGC grades
Thickness Range	0.15mm - 2.0mm	0.17mm - 1.2mm
Width Range	700mm - 1250mm	700mm - 1250mm
Zinc Coating	Z60 - Z275	Z60 - Z275
Coil ID	508mm / 610mm	508mm / 610mm
Coil Weight	3 - 10 tons per coil	3 - 8 tons per coil

 

Chemical composition is strictly controlled to ensure consistent material performance and compliance with international standards. Mill test certificates are provided with each shipment.

 

Mechanical properties are verified through comprehensive testing to ensure compliance with specifications.

 

Coating & Surface Treatment

 

Zinc Coating (GI):

- Uniform zinc coating across entire coil surface

- Coating weights: Z60, Z80, Z100, Z120, Z180, Z275

- Strong adhesion between zinc coating and substrate

- Consistent coating thickness with strict control

 

Paint Coating (PPGI):

- Top Coat Systems: Polyester (PE), High Durability Polyester (HDP), PVDF, SMP

- Back Coat Options: Epoxy primer, polyester back coat, uncoated

- Coating thickness customizable to application requirements

- Excellent paint adhesion and color consistency

 

Surface Treatment Options:

- Passivation (chromate / chromate-free)

- Oiling (light oil for temporary rust protection)

- Passivation + Oiling (combined protection)

- Anti-fingerprint treatment

- Zero spangle / minimized spangle / regular spangle finishes

 

Surface Quality

 

- Solid and homogeneous coating along entire coil length

- No uneven coating layers, excrescences, pinholes or other defects

- Clean, uniform surface free from visible defects

- Precise dimensional tolerances according to international standards

- Color consistency (PPGI): ΔE < 1 between batches

- Winding even and uniform, without reel effect

 

Product Features

 

- Customizable specifications: thickness, width, steel grade, zinc coating, color, coating system

- Consistent mechanical properties across all batches

- Excellent formability for roll-forming, bending, stamping and deep drawing

- Superior corrosion resistance from zinc coating and paint system

- Precise dimensional tolerances meeting international standards

- Multiple surface finishes and treatments available

 

Applications

 

Building & Construction

- Roofing sheets and wall cladding

- Structural framing and light gauge steel

- Sandwich panels and garage doors

- Window frames and door profiles

 

Roll Forming & Fabrication

- Section steel, purlins and girts

- Pipe and tube manufacturing

- Industrial shelving and racking

 

Home Appliance Industry

- Refrigerator panels and back panels

- Washing machine and air conditioner components

- Water heater shells and oven parts

 

Automotive Industry

- Body panels and structural components

- Interior parts and chassis components

 

General Applications

- HVAC components and electrical enclosures

- Agricultural buildings and storage

- Metal stamping and deep drawing

 

Quality Control

 

Production Process Inspection:

- Raw material inspection with mill certificate verification

- In-process monitoring with continuous thickness and surface inspection

- Zinc coating weight measurement with precise control

- Coating thickness measurement (PPGI)

 

Product Testing:

- Mechanical properties: tensile strength, yield strength, elongation, hardness

- Coating performance: adhesion, flexibility, impact resistance

- Surface quality: visual and instrumental inspection

- Dimensional verification: thickness and width tolerance check

- Color measurement (PPGI): spectrophotometer verification

 

Available Documentation:

- Mill Test Certificate (chemical composition + mechanical properties)

- Dimensional inspection report

- Coating weight / thickness test report

- Mechanical properties test report

- Third-party inspection (SGS, BV, TUV upon request)