Hot-Dip Galvanized Steel Coil

Product name: Hot Dip Galvanized Steel Coil/Sheet (HDGI)

Standard: EN, DIN, JIS, ASTM

Thickness & Tolerance: 0.12-6.00mm (+0/-0.001mm), or customized as required

Width & Tolerance: 600-1500 mm (+/-0.06mm), or customized as required

Hardness: Soft (normal), Hard, Full hard

Brand: AIYIA

Zinc Coating: 30-275 G/M², or customized as required

Spangle: Normal Spangle coating(NS), Minimized Spangle coating(MS), Spangle-Free(FS)

Surface Treatment: Anti-Finger printing, Chromated, Oiled, Non-Oiled

Steel Grade: Dx51D, Dx52D, Dx53D, DX54D, S220GD, S250GD, S280GD , S350GD, S350GD, S550GD; SGCC, SGHC, SGCH, SGH340, SGH400, SGH440, SGH490, SGH540, SGCD1, SGCD2, SGCD3, SGC340, SGC340 , SGC490, SGC570; SQ CR22 (230), SQ CR22 (255), SQ CR40 (275), SQ CR50 (340), SQ CR80 (550), CQ, FS, DDS, EDDS, SQ CR33 (230), SQ CR37 (255), SQCR40 (275), SQ CR50 (340), SQ CR80 (550); or Customer’s Requirement


Coil Weight3-20 metric ton per coil
CertificationISO, SGS
Monthly production 5000-10000 tons
MOQ(Minimum order quantity) 20 tons
Delivery time Stock: 7days
Futures: 15-35 days
Packaging water proof paper is inner packing,galvanized steel or coated steel sheet is outer packing , side guard plate,then wrapped by seven steel belt.or according to customer’s requirement
Port Shanghai
Export marketEurope
Central Asia
Southeast Asia
Middle East
South America
North America, etc

Product Introduction

Galvanised steel coil
gi coil

Hot-dip galvanizing is the reaction of molten metal with an iron substrate to produce an alloy layer, thereby combining the substrate and the plating layer. Hot-dip galvanizing is to pickle iron and steel parts first. In order to remove iron oxide on the surface of iron and steel parts, after pickling, it is cleaned in an ammonium chloride or zinc chloride aqueous solution or a mixed solution of ammonium chloride and zinc chloride.And then sent to the hot-dip plating bath. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.

hdgi coil
Galvanized factory

Shanghai Aiya Industrial Co., Ltd. produces high-quality hot-dip galvanized steel coils and electrogalvanized coils. As a very cost-effective building material and decorative material, because our products are cheap and reliable, our products are sold all over the world, favored by local customers, and also promote the development of the local economy. Friends from all over the world welcome you to buy our products!

Layer Schematic

Diagram of zinc coated steel sheet surface coating and layers

Surface Structure

hot dipped galvanized steel sheet (hdgi)normal spangle coating

Normal spangle

Through addition of certain heavy metal element into molten zinc bath, regular spangle pattern is produced on Hot-dip zinc-coated steel sheet.

hot dipped galvanized steel sheet 
 minimized spangle coating

Minimized spangle

The zinc layer(coating) does Not contain Lead(Pb), which complies with EU WEEE and RoHS directives. This is a non-toxic and environmental friendly material.

hot dipped galvanized steel sheet spangle-free coating


During hot-dip galvanizing, only a certain amount of aluminum is added to the zinc solution, and lead-free, antimony, and tin are not added to produce spangle-free products.

Production Process

hot dip galvanized steel coil (hdgi)production process

Factory Environment

Galvanized Steel Coil Factory environment
Galvanized Steel Coil Factory environment

Product Packaging

Product Packaging
Product Packaging

Quality Inspection

galvanized steel Quality Inspection
galvanized steel Quality Inspection

Loading And Transportation

Loading and transportation
Loading and transportation


Galvanized steel sheet products are mainly used in construction, light industry, automobile, agriculture, animal husbandry, fishery and other industries. Such as building roofing sheets, roof grilles, home appliance shells, ventilation ducts, chimneys, kitchen utensils, grain storage and transportation, frozen processing of meat and aquatic products, etc.

Main Features

Anticorrosive: 13 years in heavy industrial areas, 50 years in the ocean, 104 years in the suburbs and 30 years in cities.

Cheap: The cost of hot-dip galvanizing is lower than that of other coatings.

Reliable: The zinc coating is metallurgically bonded to the steel and forms part of the steel surface,so the coating is more durable.

Strong toughness: The galvanized layer forms a special metallurgical structure that can withstand mechanical damage during transportation and use.

Comprehensive protection: Every part of the plated piece can be galvanized, and is fully protected even in depressions,sharp corners, and hidden places.

Save time and energy: Galvanizing process is faster than other coating methods.

Advantages of AIYIA

Three hot dip galvanized steel coil production lines, using the most advanced equipment in China, a plant area of 30,000 square meters.

Advanced equipment

Three galvanized steel coil production lines, using the most advanced equipment in China, a plant area of 30,000 square meters.

Galvanized steel coils with a monthly output of about 5000-10000 tons, and have sufficient inventory.


Galvanized steel coils with a monthly output of about 5000-10000 tons, and have sufficient inventory.

We have professional sales staff in Spanish, Portuguese, French, Arabic, and Russian for different markets.

Sales services

We have professional sales staff in Spanish, Portuguese, French, Arabic, and Russian for different markets.

Quality Certification

Our Base Steel Supplier

GI Steel CoilS & Sheets base steel

We choose high-quality raw materials. Our base steel comes from Baosteel, Shougang, etc., and our coating materials come from Nippon, Aksu and other well-known international brands.

Introduction and Description

The difference between hot dip galvanized and electrogalvanized

1.Appearance difference
The surface of electro-galvanized steel is smooth, dense, beautiful and shiny without zinc flower.
The surface of the hot-dip galvanized steel is uneven, rough and uneven, shiny and white. Some products have zinc flowers and knocking may cause the zinc-iron alloy layer to fall off in small pieces.

2.Application range difference
Electro-galvanized is suitable for small parts.
Hot dip galvanizing is more suitable for large parts.

3.Zinc coating thickness and weight difference
1.The thickness of the electroplated zinc layer is about 10um, the zinc layer is thin, and the adhesion is weak; the minimum galvanized amount is 15g / m2 and the maximum is 100g / m2.
2.The thickness of the hot-dip galvanized zinc layer is about 60um, the zinc layer is thick, the adhesion is strong, and the zinc layer is not easy to fall off; the minimum amount of galvanizing is 40-60g / m2 on both sides and the maximum is 600g g / m2.


The difference between galvanized steel and galvalume steel

1. Resistance to atmospheric corrosion
GL(galvalume) steel sheet is excellent, while GI(galvanized) steel sheet is good.

2. High temperature oxidation resistance
GL sheet is excellent, and GI is good.

3. Processing performance
GL sheet behaves well, and GI behaves well.

4. Weldability
GL sheet behaves poorly, while GI behaves better.

5. Coating property
GL sheet behaves better, and GI behaves better.

6. Incision protection
GL sheet behaves poorly, while GI behaves better.

7. Cathodic protection
GL sheet is poor, while GI is strong.

Galvanized Steel Coil