HDG Coil

 

 

Keywords: HDG Coil, Hot-Dip Galvanized Steel Coil, GI Coil, Zinc-Coated Steel Coil, Galvanized Steel Sheet, HDG Coil Manufacturer, HDG Steel Supplier

HDG Coil, also known as Hot-Dip Galvanized Steel Coil, is a high-quality carbon steel coated with a layer of zinc through a continuous hot-dip process. It offers excellent corrosion protection, durability, and cost-effectiveness, making it a preferred choice for construction, automotive, electrical, and industrial applications.

Produced according to ASTM A653 / EN 10346 / JIS G3302, our HDG coils ensure uniform zinc coating, smooth surface finish, and precise dimensions suitable for both industrial fabrication and pre-painted steel applications.

 

Property	Metric (SI)	Imperial (US)	Remarks
Base Steel	Cold Rolled Steel (CR)	Cold Rolled Steel	ASTM A653 / JIS G3302
Coating Type	Zinc (Hot-Dip Galvanized)	Zinc (Hot-Dip Galvanized)	GI / Z coating
Coating Mass	Z30 – Z275 g/m²	0.10 – 0.90 oz/ft²	Both sides total
Thickness Range	0.20 – 2.00 mm	0.008 – 0.079 inch	Custom thickness available
Width Range	600 – 1250 mm	23.6 – 49.2 inch	±3 mm tolerance
Coil Weight	3 – 10 MT	6,600 – 22,000 lbs	Per customer requirement
Inner Diameter (ID)	508 / 610 mm	20 / 24 inch	Standard export size
Surface Finish	Smooth, Spangle, Zero Spangle	–	Optional
Tensile Strength	270 – 550 MPa	39 – 80 ksi	Depends on steel grade
Yield Strength	≥ 230 MPa	≥ 33 ksi	–
Elongation	≥ 20%	–	ASTM A653 requirement
Tolerance (Thickness)	±0.02 mm	±0.0008 inch	Standard EN 10143
Tolerance (Width)	±3 mm	±0.12 inch	Standard JIS G3302

 

 

Element	Content (%)
Carbon (C)	0.12 – 0.25
Manganese (Mn)	0.30 – 0.80
Phosphorus (P)	≤ 0.04
Sulfur (S)	≤ 0.05
Silicon (Si)	0.10 – 0.50
Iron (Fe)	Balance

 

Product name	Galvanized steel coil
Hs code	721049
Standard	JIS G3302, ASTM A653M / A924M, IS277/92, AS 1397, EN 10142, EN 10147, DIN 17162, ES C. D7. 001 or equivalent
Grade	SGCC, SGCH, DX51D, DX52D, DX53D, S220GD, S250GD+Z, S280GD+Z, S320GD+Z, S350GD+Z, S550GD+Z.
Thickness	0. 11~4. 0mm
width	97-1250mm
Zinc coating	30-275g/m2
Coil id	508mm/610mm
Surface finish	Regular Spangle, Minimized Spangle, Zero spangle(Extra Smooth), Skin-Passed,
Surface treatment	Chromated / Unchromated Treatment, Oiled or Resin Coated (Anti Finger Print), Dry
Hardness	soft hard(HRB<60);medium hard(HRB60~85);full hard(HRB85~95)
Yield Strength	140-300 (DQ Grade)
Tensile Strength	270-500 (CQ Grade)/270-420 (DQ Grade)
Elongation Percentage	22 (CQ Grade thickness less 0. 7mm) / 24 (DQ Grade thickness less 0. 7mm)

 

Construction Industry​

HDG Coils are widely used in roofing and wall cladding. Their corrosion resistance ensures the longevity of buildings, protecting them from rain, snow, and sunlight. They are also used in the construction of scaffolding, where durability and safety are crucial.

 

Automotive Industry​

In the automotive sector, HDG Coils are used for parts like chassis components and body panels. The corrosion resistance helps cars withstand road salt, water splashing, and various weather conditions during their lifespan.​

 

Manufacturing of Industrial Equipment​

HDG Coils find application in the manufacturing of storage tanks, ventilation ducts, and agricultural equipment. Their ability to resist corrosion in industrial and agricultural environments makes them a preferred choice.

 

 

Our factory is equipped with advanced production lines and strict quality control systems.

 

Standards applied in different countries to set the requirements for hot dipped galvanized steel coils specify steel grade and size ranges for these products. Hot dipped galvanised coils are classified based on the following features:

 

● Application of coated steel (profiling, cold forming, manufacture of steel structures)

 

● Chemical composition of coating material (pure zinc, zinc-iron/zinc-aluminium/aluminium-zinc/zinc-magnesium alloys, etc)

 

● Thickness/weight of protective coating

 

►HDG coils according to European standards

 

Galvanised steel coils as per the European EN 10346, can be coated with zinc, zinc-iron alloy, zinc-aluminium alloy, aluminium-zinc alloy or aluminium-silicon alloy:

 

● Zinc coating (Z) is achieved by dipping the prepared strip into a bath with molten alloy, containing at least 99% zinc. This is the most common and traditional way of protecting rolled steel from corrosion.

 

● Zinc-iron coating (ZF) is formed by dipping a strip into a bath of molten zinc (at least 99% zinc) with further annealing to form a zinc-iron coating with an Fe content of 8-12%. Such coating is stronger than the traditional zinc coating and has better adhesion with substrate steel due to mutual diffusion between the iron and zinc in the surface layers. That is why this coating is less exposed to lamination or pitting under impact, mechanical stresses or deformation of treated products.

 

● Zinc-aluminium coating (ZA) is applied to rolled steel by dipping it into a bath of zinc and about 5% aluminium with a minor content of mishmetal (mix of metals). Rolled steel with such coating has better formability and corrosion protection properties compared with zinc-coated steel.

 

● Aluminium-zinc coating (AZ) is applied by dipping steel into a bath of molten metal consisting of 55% aluminium and 1. 6% silicon (with the remaining being taken up by zinc). The combined action of these metals ensures the best corrosion protection compared with other coatings.

 

● Aluminium-silicon coating (AS) is created by dipping steel into a bath of molten metal containing aluminium and 8-11% silicon. Galvanized steel coil with such coating is highly resistant to oxidation at high temperature (up to 650°C) and highly resistant to chemical corrosion.

 

Every HDG Coil undergoes rigorous quality inspection:

Raw Material Verification: Steel grade and zinc quality check

Coating Thickness Measurement: Both sides checked with calibrated gauges

Tensile & Yield Tests: Mechanical properties verified per ASTM / EN

Surface Inspection: Visual and spangle check

Bend & Forming Tests: Confirm formability and adhesion

Corrosion Test: Salt spray (ASTM B117) optional

Third-Party Verification: SGS / BV / TUV available before shipment

Documentation Supplied:

Mill Test Certificate (EN 10204 3.1/3.2)

Coating Thickness & Surface Inspection Report

Packing List & Certificate of Origin

 

Packaging: Waterproof paper + steel strip + wooden pallet

Coil ID: 508 / 610 mm standard

Weight: 3–10 tons per coil

Marking: Grade, zinc coating, coil number, manufacturer logo

Delivery: 15–25 days depending on quantity

Shipping: Sea-worthy export packing suitable for long transport

 

Q1: What is HDG Coil?
A1: HDG Coil is hot-dip galvanized steel coil coated with zinc for corrosion protection.

Q2: What does Z275 mean?
A2: Z275 indicates a zinc coating mass of 275 g/m² (both sides).

Q3: Can HDG Coil be painted?
A3: Yes, it is the standard base for pre-painted galvanized steel (PPGI).

Q4: What is the typical service life?
A4: 15–30 years under normal atmospheric conditions.

Q5: What standards do you follow?
A5: ASTM A653, EN 10346, JIS G3302.

Q6: Can you provide cut-to-length sheets?
A6: Yes, we offer slitting, cut-to-length, and roll forming services.

Q7: What thickness and width tolerances are offered?
A7: Thickness ±0.02 mm, width ±3 mm.

Q8: Can HDG Coil be exported internationally?
A8: Yes, standard seaworthy packaging ensures safe shipment worldwide.

Q9: Is HDG Coil magnetic?
A9: Yes, it is ferromagnetic as it's based on carbon steel.

Q10: Do you provide third-party inspection?
A10: Yes, SGS, BV, or TUV inspection is available upon request.

 

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