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Product Description

Produced by immersing cold rolled steel coil into a molten zinc bath, forming a uniform zinc coating for excellent corrosion resistance. Features smooth surface, strong coating adhesion, and good formability. Available grades: DX51D, DX52D, DX53D, S220GD, S250GD, S350GD, S550GD, SGCC, SGCH. Coating types: pure zinc (Z), zinc-iron alloy (ZF), or Galfan (ZA). Coating weight: Z40 – Z275 (g/m²). Surface finishes: regular spangle, minimum spangle, zero spangle, or matt. Additional treatments: chromated, chromate-free, oiled/un-oiled, anti-fingerprint. Thickness: 0.12mm – 4.0mm. Width: 600mm – 1500mm. Coil ID: 508mm or 610mm. Coil weight: custom, typically 3–15 tons. Edge condition: mill edge or slit edge. Easy to cut, roll-form, and stamp. Meets ASTM A653, EN 10346, JIS G3302.

Parameter

Product name	Galvanized steel coil
Technical Standard	AISI, ASTM, DIN, JIS, GB, JIS, SUS, EN, etc
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
Thickness	0.12-6.00mm,or customer's requirement
Width	600mm-1500mm, according to customer's requirement
Type of Coating	Hot Dipped Galvanized Steel(HDGI)
Zinc Coating	30-275g/m2
Surface Treatment	Passivation(C), Oiling(O), Lacquer sealing(L), Phosphating(P), Untreated(U)
Surface Structure	Normal spangle coating(NS), minimized spangle coating(MS), spangle-free(FS)
Coil Weight	3-20 metric ton per coil
Application	Mainly used in construction, automobiles, household appliances, agriculture and other fields

Application description

Widely used in roofing and wall cladding (corrugated sheets, gutters), automotive parts (body panels, chassis), household appliances (washing machine drums, air conditioner housings), electrical enclosures, storage tanks, ventilation ducts, and light steel framing. The zinc coating provides long-lasting corrosion protection, making it ideal for outdoor, humid, or chemically exposed environments. Suitable for roll forming, stamping, and profiling.

Production description

The process begins with cold rolled steel coils, which are degreased, pickled, and fluxed to remove oil and oxides. The clean coils are then annealed in a continuous galvanizing line under a reducing atmosphere. The strip is immersed in a molten zinc bath at about 450°C, forming a metallurgical bond. Air knives precisely control the zinc coating weight (Z40–Z275). After exiting the bath, the coated strip is cooled and solidified. Skin passing may be applied to improve flatness and surface finish. Final treatments include chromating (or chromate-free passivation), oiling, or anti-fingerprint coating as required. The continuous coil is then inspected, trimmed at edges, and rewound into coils with inner diameter 508mm or 610mm. Finished coils are tested for coating uniformity, adhesion, and dimensional accuracy.

Shipping Packaging

For export, galvanized steel coils are wrapped with VCI paper and moisture-proof polyethylene, placed on ISPM-15 certified wooden pallets or steel skids, secured with steel straps, and fitted with edge protectors and coil protectors. Labels include grade, coating weight, dimensions, coil weight, and heat number for safe sea freight.

Why Choose Us?

1.Factory Strength – Direct manufacturer with integrated pickling, cold rolling, and continuous galvanizing lines for full process control and stable supply.

2.Quality Assurance – Strict control of zinc coating weight (Z40–Z275), spangle uniformity, and adhesion; compliant with ASTM A653, EN 10346, JIS G3302.

3.Certifications & Reports – Mill test certificates (MTC) with each shipment; third-party inspections (SGS, BV) and salt spray test reports available.

4.Customization & Service – Wide grade range (DX51D–S550GD, SGCC), coating types (Z, ZF, ZA), surface treatments (chromated, anti-fingerprint), custom widths and coil weights with fast lead times.

5.Export Packaging – VCI paper + moisture-proof wrapping + ISPM-15 pallets/skids + edge protectors for safe sea freight and coil edge protection.

FAQ

1. How to store galvanized steel coils to prevent white rust?
Store indoors in dry, well-ventilated area, keep original moisture-proof wrapping intact, avoid stacking coils directly on wet floors, and maintain humidity below 70%.

2. What coil inner diameters (ID) can you supply?
We supply coils with standard ID 508mm (20 inches) and 610mm (24 inches). Custom ID available upon request to fit your uncoiling equipment.

3. What zinc coating weights are available and which environment suits each?
We offer Z40–Z275 (g/m²). Z40–Z90 for mild indoor use; Z100–Z180 for general outdoor exposure; Z200–Z275 for harsh, coastal, or high-humidity environments.

Customer Reviews

FACTORY APPEARANCE

HONORS AND QUALIFICATIONS

The company has sufficient inventory and complete varieties and specifications. Special materials and specifications are produced according to customer requirements and exported to Asia, the Middle East, Europe and other countries and regions. We have our own quality management systems: ISO9001, ISO14000, OHSAS18001 standards.

Electromagnetic Compatibility and Low Voltage Directive Certification

ABS Classification Society Certification Certificate

Quality Management System Certification Certificate 2

IATF 16949 Quality Management System Certification Certificate

API Q1 Quality System Certification Certificate

CCS Classification Society Certification Certificate

CUSTOMER VISIT

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We understand that our customers value quality and after-sales service most. We consistently adhere to high standards and strict requirements, striving to become your preferred partner.

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Galvanized Steel Coil