Z275 Galvanized Steel

Z275 galvanized steel is a hot-dip galvanized steel product compliant with European Standard EN 10346. Recognized internationally as a high-protection-grade galvanized product, it offers an exceptionally long service life, making it the preferred corrosion-resistant metal material across multiple industries.

With two hot-dip galvanizing production lines, we can manufacture galvanized products with zinc coating weights ranging from Z30 to Z275 g/m². Equipped with diverse processing machinery, we produce galvanized flat sheets, corrugated sheets, coil strips, and other forms.

Wanzhi Z275 coil

Z275 GI coil

Z275 GI Steel Specification

Production Video

What is Z275 galvanized steel?

Z275 galvanized steel is produced through the hot-dip galvanizing process, where the base steel is immersed in molten zinc. This creates a uniform, dense zinc coating with a minimum weight of 275g/m². The specifications break down as follows:

• “Z” stands for “Zinc,” the internationally recognized symbol for galvanized coatings.
• “275” indicates the minimum total zinc coating weight of 275 grams per square meter on both sides of the steel plate.

Galvanized steel profiled sheet

Z275 Galvanized Metal Profiled Sheet

Z275 Galvanized Steel Properties

• Superior Corrosion Resistance: The substantial zinc coating thickness of Z275 forms a robust protective barrier on the substrate, making it suitable for corrosive environments such as coastal high-salt-fog areas and humid industrial zones.
• Excellent Formability: Utilizing premium steel grades like DX54D, DX53D, DX52D, DX51D, S250GD, and SGCH, it meets both standard processing and ultra-deep drawing requirements.
• Diverse Surface Types: Four zinc flower patterns with multiple surface treatments offer practicality and aesthetics, catering to various industry needs.

Galvanized Coils Zero Spangle

HDG Coils with Spangles

Big Spangles of GI Sheet

Zinc Flower Types

• Zero Spangles: Smooth, flat surface ideal for pre-painting or laminating.
• Small Spangles: Delicate texture with a clean visual appearance.
• Regular Spangles: Naturally uniform zinc flowers offering broad versatility.
• Large Spangles: Strong three-dimensional effect with prominent decorative appeal.

Spangles

Surface Treatments

• Standard Passivation (C): Forms an ultra-thin chemical conversion coating on the zinc layer, primarily preventing white rust during transport and storage.
• Chromium-Free Passivation (C5): Environmentally friendly passivation treatment controlling harmful substances like hexavalent chromium in the passivation solution.
• Fingerprint-Resistant Treatment (N): A fingerprint-resistant coating applied after passivation, primarily preventing fingerprint marks during handling and processing.
• Chromium-free fingerprint resistance (N5): Combines white rust prevention, fingerprint resistance, and blackening resistance while being environmentally friendly by excluding harmful substances like hexavalent chromium.
• Oil coating (O): Applies a rust-preventive oil layer to the surface, providing strong short-term rust protection.

zero zinc flower galvanized coil

oil surface treatment

Uses of Z275 galvanized steel

• Construction industry: It can be used to manufacture anti-corrosion roofs, roof grilles, rolling doors, and garage doors for industrial and civil buildings, providing good protection.
• Light industry: In the field of home appliance manufacturing, it can be used to make refrigerator bases and shells, freezer shells, kitchen equipment, solar water heaters, etc., industrial instrumentation and electronic control cabinets, industrial refrigeration equipment, and vending machines.
• Automotive industry: It is mainly used to manufacture automotive parts such as body shells, chassis, doors, trunk lids, fuel tanks, car roofs, etc., thanks to its stamping performance and corrosion resistance.
• Daily use: It can be used as steel window blanks and color coating substrates, etc., to provide basic material support for the metallurgical industry, household lampshades, counters, signboards, medical facilities.
• Other fields: It can also be used to manufacture elevators, sanitary ware, rail transit, pressure vessels, architectural decoration, nuclear power, catering kitchenware, chemical equipment, daily electrical appliances, edible machinery, structural pipe making and other products, with a very wide range.

Washing machine back panel

Z275 Pipeline Transportation

Home Appliance Uses

Relationship Between Z275 and G90

Z275 and G90 represent different unit expressions for the same galvanized standard, with identical fundamental properties:

• Z275: International System of Units (SI) notation, indicating a zinc coating weight of 275g per square meter on both surfaces of the steel, classified as a high-zinc coating specification;
• G90: American standard (ASTM A653) imperial unit designation, indicating a zinc coating weight of 0.90 ounces per square foot on both surfaces of the steel;

Conversion formula: 1 oz/ft² (ASTM) = 305.15 g/m² (SI). Precisely converted, 0.90 oz/ft² is approximately 275 g/m². Therefore, both are fully equivalent and can meet standard certification requirements in different regions.

Chromate Passivation

Chrome-free and fingerprint-resistant

Wanzhi Steel Packaging

steel coil package

Standard export packaging for steel plates

Wanzhi Steel – Professional Manufacturer of Z275 GI Steel

Choosing Z275 galvanized steel means choosing durable quality assurance!

With its excellent anti-corrosion performance and ultra-long service life, Z275 galvanized steel is becoming the preferred material for more and more engineering projects. As an industry-leading galvanized steel supplier, Wanzhi Steel has advanced production equipment, strict quality control system and rich export experience to ensure that every roll of Z275 galvanized steel meets international standards. We provide a variety of specifications and customized services to meet your diverse needs.

Contact Wanzhi Steel now to get professional product solutions and high-quality after-sales service to make your project more competitive!