How YIER Solved White Rust and Bending Cracking for a 1,500-Ton Galvanized Steel Sheet Order in the Middle East

When importing Galvanized Steel Sheets and Coils (GI) for HVAC ductwork, roofing sheets, or structural framing, global buyers face two major challenges: zinc coating flaking during deep stamping and white rust caused by ocean freight humidity.

A leading HVAC and building materials distributor in the UAE recently approached YIER with a demanding request. They required over 1,500 tons of high-grade hot-dip galvanized steel sheets. Their previous supplier provided sheets with inconsistent zinc adhesion, which cracked during lock-forming, and severe white rust caused by moisture during sea transport.

Here is how YIER stepped in to solve these manufacturing and logistics bottlenecks, delivering a zero-defect shipment on time and earning a long-term supply agreement.

The Buyer’s Challenge: Flaking Zinc, White Rust, and Tight Tolerances

The client’s manufacturing and storage conditions presented strict quality hurdles:

• Lock-Forming and Bending Stress: The galvanized sheets were fed into high-speed automatic duct-forming machines. Inferior zinc adhesion would cause the protective layer to peel off at 90-degree bends, exposing the base metal to rapid corrosion.

• Extreme Transport Humidity: The shipment needed to travel across high-humidity sea routes. Any moisture trapped between stacked sheets would trigger severe wet-storage strain, commonly known as white rust.

• Strict Zinc Coating Uniformity: The order required a guaranteed Z275 zinc coating (275 grams per square meter) to withstand harsh desert and coastal outdoor exposure.

The YIER Solution: Advanced Passivation, Zero Spangle Control, and 5-Layer Export Packaging

To eliminate these issues, the YIER technical and quality control teams implemented a full-process quality assurance strategy:

• Enhanced Chemical Passivation and Chromating: YIER applied an environmentally friendly chromate passivation treatment combined with an anti-fingerprint coating on the steel surface. This invisible barrier prevents zinc oxidation even during long-term maritime transit and high-humidity storage.

• Precise Temperature and Zinc Bath Control: To ensure maximum zinc adhesion, YIER used zero-spangle, continuous hot-dip galvanizing technology. By tightly controlling the annealing temperature and zinc bath purity, the zinc layer bonded atomically with the steel substrate, preventing flaking during 180-degree bending and deep drawing.

• Seaworthy 5-Layer Export Protection: YIER packed every bundle of galvanized steel sheets with heavy-duty waterproof craft paper, inner plastic film, galvanized iron edge protectors, steel strapping, and solid wooden skids to prevent direct contact with ocean air and moisture.

Project Outcome: Real Results Delivered by YIER

By partnering with YIER, the Middle Eastern client achieved complete operational peace of mind:

• Zero Flaking Rate: 100% of the galvanized sheets passed the duct lock-forming test without a single incident of zinc coating cracking or peeling.

• 100% Corrosion-Free Arrival: All 1,500 tons arrived at the Port of Jebel Ali in pristine condition, completely free of white rust or surface oxidation.

• Full Zinc Thickness Guarantee: On-site digital coating gauge tests confirmed an average zinc coating across all sheets meeting and exceeding the requested target.

• Repeat Business: Satisfied with the quality and logistics handling, the client signed an annual contract with YIER for quarterly shipments.

“Before working with YIER, we constantly suffered from white rust and cracking zinc during cold forming. YIER’s team proved their technical mastery from raw material selection to seaworthy packaging. Every galvanized steel sheet arrived flat, bright, and ready for immediate production.”

— Procurement Manager, Middle East Building Materials Group

Why Global Buyers Trust YIER for Galvanized Steel Sheets and Coils

Whether you require regular spangle, zero spangle, or high-zinc structural sheets, YIER delivers end-to-end supply chain excellence:

• Comprehensive Grade and Specification Range: Supplying DX51D, DX52D, SGCC, ASTM A653, and CS Type A/B/C in thicknesses from 0.12 millimeter to 4.0 millimeter.

• Guaranteed Zinc Coating Range: From Z40 up to Z275 grams per square meter, fully tested with certified lab reports.

• Complete Quality Traceability: Every shipment is backed by a authentic Mill Test Certificate in accordance with EN 10204 3.1 standards.

• Value-Added Processing Services: In-house slitting, shearing into custom sheet lengths, corrugated profiling, and film application.

Request Your Free Quote from YIER Today

Stop risking your reputation and budget on inconsistent galvanized steel. Contact the YIER engineering and sales team today to request a fast quotation, physical samples, or full technical specification sheets.

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