Raysteel Resource supplies G90 galvanized steel with a minimum zinc coating of 0.90 oz/ft² (275 g/m²) on a triple-spot basis, delivering reliable corrosion resistance for roofing, wall cladding, ductwork, framing, HVAC housings and light structural fabrication. Material is available in commercial, forming and structural grades, with standard spangle or minimized spangle, and can be supplied as coils, sheets or slit strips in common gauges and widths. Each shipment is supported by mill test certificates and traceable heat numbers to help buyers meet project and inspection requirements. For current stock, tolerances, lead time and pricing, please send your specification for a quick quotation.

 

G90 Steel

What Is G90 Steel and What Does the G90 Designation Mean?

G90 Steel is hot-dip galvanized steel sheet or coil with a zinc coating designation of G90 under ASTM A653. The G90 designation specifies a minimum average coating mass of 0.90 oz/ft² (approximately 275 g/m²) over both sides under the triple-spot test. G90 identifies the zinc coating level rather than the base steel grade, so the substrate grade, thickness, width and mechanical requirements should be specified separately when placing an order. Raysteel Resource supplies G90 galvanized steel in coil and sheet form for construction, fabrication and general industrial use. ASTM Store

What G90 Steel Specifications Can Be Supplied?

G90 Steel can be supplied in a practical range of dimensions for downstream processing and fabrication. Our regular supply range includes 0.50–3.00 mm thickness and 600–1500 mm width, subject to the selected base grade and production schedule. Standard coil specifications can include a 508 mm inner diameter, while the outer diameter generally varies with coil weight. Individual orders can be reviewed according to the customer's required steel standard, dimensional tolerance, surface condition and end application.

Why Is the Zinc Coating Important in G90 Steel?

The main functional feature of G90 Steel is its zinc coating. The coating acts as a physical barrier between the steel substrate and the surrounding environment, while zinc also provides sacrificial protection where the coating is locally damaged. Under ASTM A653, G90 has a minimum triple-spot average of 0.90 oz/ft² total on both sides, with a single-spot minimum of 0.80 oz/ft² total on both sides. The coating requirement should not be confused with a fixed coating thickness because coating mass and thickness are different measurements. ASTM Store

For buyers, this makes G90 Steel suitable when a galvanized coating level above lighter coating designations is required without moving to a heavier zinc specification.

Where Can G90 Steel Be Used?

G90 Steel is commonly selected for fabricated products where both corrosion protection and practical sheet-metal processing are required. Typical applications include:

Roofing: roof panels, flashing and formed roofing components

Wall Systems: exterior cladding and building panels

HVAC: ductwork, ventilation sections and equipment housings

Sheet-Metal Fabrication: brackets, enclosures, covers and formed components

Industrial Products: fabricated panels, profiles and general-purpose components

Agricultural Buildings: roofing, siding and related formed steel parts

The appropriate base grade should be selected according to the forming operation. For deep drawing, stamping or demanding bending work, the mechanical properties of the substrate should be confirmed before production.

How Can G90 Steel Be Processed After Delivery?

Processing requirements are an important part of a G90 Steel order. Depending on the base grade and final product, the material can be used for cutting, bending, stamping, roll forming and other sheet-metal fabrication processes. Coil supply is suitable for customers operating slitting, profiling or roll-forming lines, while cut-to-length sheets can be arranged for customers that require ready-to-process dimensions.

Raysteel Resource can review the required thickness, width, base grade, coating designation, edge condition and surface treatment before quotation. This helps prevent a common purchasing problem: receiving material with the correct G90 coating but an unsuitable substrate or dimensional specification for the customer's production line.

What Quality Information Is Available With G90 Steel?

Each G90 Steel order can be specified with inspection requirements covering thickness, width, coating mass, surface appearance and mechanical properties, according to the agreed material standard. A Mill Test Certificate (MTC) can be provided when included in the purchase specification. Coil identification and packing details can also be matched with the shipping documents to facilitate receiving inspection.

For export orders, Raysteel Resource can arrange waterproof packaging, steel strapping, edge protection and seaworthy packing according to the transportation method and destination. Before shipment, the specification is checked against the confirmed purchase order rather than relying only on a general product description.

How Can You Request a G90 Steel Quotation From Raysteel Resource?

For a precise G90 Steel quotation, send us the following information:

Thickness + Width + Base Grade + G90 Coating + Quantity + Coil/Sheet + Destination Port

For example:

G90 Steel Coil / 1.20 mm × 1250 mm / ASTM specification / 100 MT / FOB Shanghai

Raysteel Resource can then check the suitable material source, production availability, packing arrangement and shipping terms before issuing a quotation. FOB, CFR and CIF pricing can be discussed according to the destination. For project orders, customers can also provide their required standard, tolerance, surface condition and inspection requirements so the quotation is based on the actual purchasing specification rather than a generic G90 Steel price.