Z275 Galvanized Steel

With a zinc layer thickness of 275g/㎡, Z275 galvanized steel provides excellent corrosion resistance and is an ideal choice for harsh environments. It is widely used in building roofs, industrial equipment, transportation facilities, and other fields. Its high zinc layer protection ensures a service life of more than 20 years while maintaining excellent processing formability. As a professional galvanized steel supplier, Wanzhi Steel provides customized services in a variety of specifications and widths, lengths, and thicknesses to help global infrastructure & manufacturing projects. A large number of regular stocks, if you are interested, please contact us

Z275 GI Steel Specification

Item	Z275 GI Steel
Place of Origin	Shandong, China
Standard	AISI, ASTM, DIN, JIS, GB, EN
Substrate	Hot rolled steel/Cold rolled steel
Steel Grade	SGCC, SGCH, G350, G450, G550, DX51D, DX52D, DX53D
Surface treatment	Hot dipped galvanized
Zinc Layer Thickness	275g/㎡(Z275/G90)
Supply form	Sheet/Coil/Strip/Tube
Color	Silver
Spangle Type	Zero spangles, Small spangles, Regular spangles, Big spangles
Length	Can be specified
Thickness	0.12mm-2mm
Width	600mm-2,000mm
Payment term	TT 30% Advance + 70% Balance
Sample	Free Available
Price Item	FOB, CIF, EXW, CFR, etc
Packing	Standard export packaging
Certification	ISO 9001, SGS, ABS, BV
MOQ	5 Tons

What is Z275 galvanized steel?

Z275 galvanized steel is a hot-dip galvanized steel. This steel is made by hot-dip coating a layer of zinc on the surface of the substrate, giving it excellent corrosion resistance and mechanical properties. In normal atmospheric conditions, its service life can reach 20-50 years, depending on environmental conditions such as humidity and pollution level.

Character Definition

• Z: represents the chemical formula of zinc, Zn. Generally, “Z+number” is used to represent the weight of the zinc layer on both sides of the galvanized sheet per square meter, such as: Z10, Z120, Z180, which represent the weight of the zinc layer on both sides of the galvanized sheet per square meter of 100 grams, 120 grams, and 180 grams respectively.
• 275: represents the weight of the zinc layer, that is, 275 grams of zinc per square meter. This value is an internationally recognized standard for the average thickness of the zinc layer of galvanized steel sheets.

Z275 galvanized steel properties

• High corrosion resistance: Z275 means that the weight of zinc on both sides of each square meter of steel plate is 275 grams. The zinc layer provides an anti-corrosion barrier, can resist moisture and salt spray, and prolong the service life.
• Good processing performance: It maintains the original processing performance of the steel plate, such as welding, stamping, cutting, etc., and is easy to make components of various shapes and sizes.
• Moderate coating: Generally speaking, the zinc layer thickness between 8μm and 12μm can meet most anti-corrosion needs, while the zinc coating weight of Z275 provides thicker zinc layer protection, further enhancing the rust resistance.
• Mechanical properties: Good cold bending performance, yield strength from 240MPa to 500MPa. Tensile strength ranges from 270MPa to 500MPa. Good elongation, meeting the requirements of general processing and ultra-deep drawing.

Production Video

Surface treatment 

• C: Chromate Passivation. Surface treatment used after hot-dip plating of high-strength steel plates to reduce white rust during transportation and storage.
• C5: Chrome Free Passivation. Surface treatment to limit the amount of environmentally and human-harmful chromium VI in the passivation solution.
• N: Fingerprint-Resistant. Surface treatment after the passivation process to lubricate during processing, to prevent fingerprint staining during handling, and to prevent premature blackening of the surface during use.
• N5: Chrome-free and fingerprint resistant. The surface treatment after the passivation process acts as a lubricant during processing, prevents fingerprint staining during operation, prevents premature blackening of the surface during use, and requires limiting the amount of hexavalent chromium and other substances in the fingerprint-resistant film that are harmful to the environment and the human body.
• O: Oil. Surface treatment was added after the passivation process to further minimize rust and corrosion during long-distance transportation and long-term storage.

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.

What is the difference between Z275 and G90?

Z275 and G90 are different expressions of the same galvanizing standard.

G90 Meaning

It is the imperial expression of the American Standard (ASTM A653), expressed in ounces per square foot. G90 requires a minimum average TST of 0.90 oz/sq ft (total – both sides).

Z275 Meaning

It is the expression in the International System of Units (SI), in g/m2; 275 g/m2 is a high zinc coating. g90 zinc coating after unit conversion, its weight is exactly 275 g/m2. That is, Z275.

Z275 – weight marking of coating

Z275 is the coating weight designation for coated steel sheets. Today, ASTM standards specify and define the type of coating for these products. For example, the most common ASTM standard on the market today is A653A or A653M; this covers all hot-dip galvanized commodities. The numbers in the standard indicate the weight of the galvanized surface of the steel sheet. In addition to the ASTM standard, there is also the SI metric system. The two systems are similar, except that the SI system converts inches and pounds of weight to ounces per square foot (oz/ft2), which is then converted to the SI standard mass in grams per square meter (g/m2).

Plating Conversion Formula

1 oz/ft2 (ASTM) = 305.15 g/m2 (SI)

Package

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!