Galvanized Steel: Properties, Applications & Pricing Guide

What is Galvanized Steel?

Galvanized steel is carbon steel coated with a protective zinc layer to prevent rust and extend its lifespan. Two primary methods are used:

1. Hot-Dip Galvanizing (HDG):

– Steel is immersed in molten zinc (450°C), forming a thick, durable layer (Z60-Z275 coating).

– Ideal for outdoor exposure (bridges, roofing).

2. Electro-Galvanizing (EG):

– Zinc is electroplated onto steel, creating a thinner, smoother finish (ZE coating).

– Used for indoor appliances and automotive parts.

Key Coating Standards:

Substrate Type	Coating Code	Low Corrosion (g/m²)	Medium Corrosion (g/m²)	High Corrosion (g/m²)
Hot-Dip (Z)	Z275	90/90	125/125	140/140
Electro (ZE)	ZE40	40/40	60/60	-

Properties of Galvanized Steel

√腐食抵抗：

– Zinc sacrificially corrodes before steel, offering 15–50 years of protection (tested per ASTM B117).

– Coating Lifespan = 1.6 µm/year in rural areas vs 12 µm/year in coastal zones.

√Weather Resistance:

– Withstands UV rays, rain, and -40°C to 120°C temperatures (EN ISO 1461).

√Aesthetic Versatility:

– Spangle Types: Regular, minimized, or zero-spangle finishes for decorative needs.

√Eco-Friendly:

– 100% recyclable with a 60% lower carbon footprint vs stainless steel.

Applications of Galvanized Steel

1. Galvanized Steel Sheets

業界	ユースケース	Recommended Coating
工事	Roofing, wall panels, guardrails	Z180 (125/125 g/m²)
自動車	Body panels, chassis parts	ZE40 (electro-galvanized)
農業	Grain silos, livestock equipment	Z275 (140/140 g/m²)

2. Galvanized Steel Pipes

セクタ	アプリケーション	基準
Oil & Gas	Water transmission, structural supports	ASTM A53, EN 10255
HVAC	Ductwork, ventilation systems	ASTM A795

Does Galvanized Steel Rust?

While zinc provides robust protection, damage to the coating (e.g., deep scratches) exposes steel to corrosion. Lifespan factors:

– Coating Thickness: Z275 lasts 2x longer than Z60 in salty environments.

– Environment: Acidic pH (<5) or industrial pollutants accelerate rust.

予防措置：

– Apply touch-up paint (epoxy or zinc-rich primers) on damaged areas.

– Avoid direct contact with copper or brass to prevent galvanic corrosion.

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1. 60,000+ Ton Annual Capacity: Meet urgent project timelines with 15-day lead times.

2. Certified Quality: ASTM, EN, and JIS compliance with full MTRs (Mill Test Reports).

3. Custom Solutions:

– Pre-painted galvanized steel (RAL colors).

– Custom cutting, slitting, and embossing.

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