Hot Dipped 0.15mm 3.8mm Galvanised Steel Sheet JIS G3302 SGCC Big Spangle

1.Product Overview

Hot dipped galvanized steel sheet is used where the steel substrate needs metallic zinc protection before fabrication or installation. This product range is suitable for roofing sheets, wall components, appliance parts, transport-related sheet parts, and general industrial fabrication where corrosion resistance, sheet size, and surface condition need to be selected together.

The page is centered on JIS G3302 SGCC galvanized sheet with big spangle appearance. The listed range covers 0.15–3.8mm thickness and 1000–5800mm length, so it can be used for both light formed panels and heavier fabricated parts. For visible applications, spangle type and surface treatment are not only appearance choices. They also affect handling, storage, and downstream finishing consistency.

2.Technical Solution

This product uses a hot dip galvanizing process in which the steel sheet is coated with zinc to create a barrier layer between the steel and the service environment. In practical use, corrosion performance depends on zinc coating mass, cut-edge exposure, drainage condition, installation detail, and whether the sheet is used indoors or outdoors.

The listed coating range is 40–275g/m2, covering G40–G90 routes in the ASTM designation system. Higher coating mass is generally selected when the environment is more demanding. Lower coating mass is more suitable for lighter or better-controlled service conditions.

Spangle options include regular, minimized, big, and zero spangle. Big spangle is typically selected when a conventional galvanized appearance is acceptable or preferred. Minimized or zero spangle is more suitable where a more uniform visible surface is needed. Surface treatments such as passivated, oiled, or anti-finger acrylic coating help adapt the sheet to different storage, transport, and fabrication conditions.

3.Specifications

4.Application

This material is suitable for roof panels, roof accessories, exterior wall components, garage doors, and window blind related sheet parts in building use.

It can also be used in household appliances, transportation parts, industrial control cabinets, refrigeration equipment housings, vending machine panels, and furniture related fabrication where metallic zinc protection is required before final assembly.

For roofing applications, final durability depends not only on the zinc coating but also on panel profile design, overlap detailing, water drainage, and actual exposure conditions at the installation site.

5.Processing

• The sheet can be used for cutting, bending, profiling, punching, and general sheet metal fabrication.
• For visible parts, spangle type and surface treatment should be selected before production because they affect final appearance and handling behavior. Big spangle is usually chosen for a conventional galvanized visual effect. Minimized or zero spangle is more suitable when the project needs a more uniform appearance.
• For roofing conversion, the forming route should be checked against sheet thickness and panel geometry. For outdoor service, storage and installation details should be controlled so that water is not trapped at overlaps, joints, or cut edges.

6.Advantages

• The 0.15–3.8mm range covers both light gauge sheet processing and heavier fabricated components.
• The 40–275g/m2 zinc coating range allows the product to be selected according to actual corrosion requirement instead of using one fixed coating level for all projects.
• Multiple spangle options allow the sheet to be matched to visible surface requirements and downstream finishing needs.
• Passivated, oiled, and anti-finger surface conditions give more flexibility for storage, handling, and fabrication routes.
• The listed standard widths are practical for roofing, appliance, and industrial sheet conversion.

7.How to Choose

• Choose zinc coating level according to the actual service environment. For lighter indoor or protected use, a lower coating level may be acceptable. For exterior or more demanding use, a higher coating level within the listed range is generally more suitable.
• Choose big spangle when standard galvanized appearance is acceptable or intentionally specified. Choose minimized or zero spangle when surface uniformity is more important.
• Choose passivated surface for standard storage protection, oiled surface for temporary transport protection, and anti-finger treatment when cleaner visible surface handling is required.
• Choose thickness according to rigidity and forming route. Thin gauges are more suitable for light panels and easier forming. Thicker gauges are more suitable for stronger structural parts and higher stiffness requirements.

8.FAQ

Q1．What is the thickness range of this hot dipped galvanized steel sheet
The listed thickness range is 0.15–3.8mm.

Q2．What zinc coating range is available
The listed zinc coating range is 40–275g/m2.

Q3．What is the difference between big spangle and minimized spangle
Big spangle gives a more visible conventional galvanized crystal pattern. Minimized spangle gives a more controlled and more uniform surface appearance.

Q4．What surface treatments are available
The listed surface treatments are passivated (chromated), oiled, and anti-finger treatment (acrylic coating).

Q5．Is this product only for roofing sheets
No. Roofing is the main listed application, but it can also be used for building components, appliances, transportation parts, industrial housings, and furniture-related fabrication.