30 Gauge is an imperial unit used to measure steel thickness. It is approximately 0.30 mm, with slight variations under different standards, and is classified as a medium-thin and lightweight material. Made of low-carbon steel with a hot-dip galvanized surface, it features excellent corrosion resistance, and is widely applied in light construction, home appliance shells, ventilation ducts, building frameworks, and general metal processing and so on.
Width: 600-1,250mm
Zinc Coating Weight: Z30–Z275 g/㎡
Standard: ASTM A653
30 Gauge Galvanized Steel Specification
| Product Name | 30 Gauge Galvanized Steel |
|---|---|
| Thickness | Approx.0.30mm (±0.02mm) |
| Width | ≤1,500mm |
| Standard | ASTM A653,EN 10346,JIS G 3302 |
| Zinc Coating Weight | Z30–Z275 g/㎡ |
| Surface Type | Big Spangle, small spangle, spangle-free, regular spangle |
| Surface Treatment | Passivation,oiling, lacquer sealing, phosphating, untreated |
| Packages | Standard export packaging or as required |
| Quality Certificate | SGS,ISO,BV,CE etc. |
Surface Types of 30 Gauge Galvanized Steel
Wanzhi Group supplies 30 Gauge Galvanized Steel in big spangle, regular spangle, small spangle and spangle-free types, with customized surface structures available per customer’s requirements.
- Big Spangle: Features obvious large zinc crystal grains with classic galvanized texture, suitable for ordinary structural use.
- Regular Spangle: Standard medium spangle with balanced appearance and corrosion resistance, widely used in general construction.
- Small Spangle: Fine and even tiny spangles, smooth surface for high aesthetic requirements.
- Zero Spangle: No visible zinc flowers, flat and uniform surface, perfect for subsequent painting and decoration.
30 Gauge Galvanized Steel Prices
The price of 30 Gauge GI steel is mainly affected by factors on material grade, zinc coating thickness, customized dimensions, as well as production processes. with a price range of USD 600 to USD 1000 per ton. In addition to 30 Gauge GI steel, Wanzhi also supplies galvanized steel sheets and coils in various specifications and thicknesses, prepainted galvanized sheets and coils, prepainted galvalume sheets and coils, zinc-aluminum-magnesium (ZAM) coated materials, corrugated sheets, metal roof panels, aluminum products and stainless steel. Factory-direct pricing with delivery within 5 to 45 working days. Feel free to contact us, and Wanzhi will offer you competitive quotations and professional project solutions.
ASTM Galvanized Steel Gauge Comparison
As gauge number increases, the galvanized steel sheet becomes thinner, with gradually reduced rigidity and improved formability to fit different application scenarios.
| Gauge | Nominal Thickness (mm) | Base Material | Features |
| 22G | 0.75 (±0.02) | DX51D, SGCC | Balanced rigidity & formability; ideal for light structural parts |
| 24G | 0.60 (±0.02) | SGCC, DX51D | Light-medium weight, good rigidity and formability |
| 26G | 0.45 (±0.02) | SGCC, DX51D | Economical, lightweight, flexible with significant cost advantages |
| 28G | 0.38 (±0.02) | SGCC | Ultra-thin & lightweight; low rigidity, mainly for covering/encapsulation |
| 30G | 0.30 (±0.02) | SGCC, DX51D | Ultra-thin, ultra-light; maximum formability for light-duty applications |
Mechanical Performance Parameter
| Gauge | Yield Strength (MPa) | Tensile Strength (MPa) | Minimum Elongation (%) |
| 22G | ≥235 | 375–500 | ≥24 |
| 24G | ≥235 | 375–500 | ≥26 |
| 26G | ≥235 | 375–500 | ≥28 |
| 28G | ≥235 | 375–500 | ≥28 |
| 30G | ≥235 | 375–500 | ≥30 |
Advantages And Usages of 30 Gauge Galvanized Steel
Wanzhi Group is equipped with two professional galvanizing production lines, with zinc coating thickness ranging from 30 to 275g/m². Our supplied 30 Gauge galvanized steel comes with standard coatings, suitable for indoor and general protection applications. Customized specifications are available upon clients’ anti-corrosion requirements. Also, we offer deep processing services including bending, slitting, forming, stamping, film laminating and punching, etc.
Advantages of 30 Gauge Galvanized Steel
- Lightweight Design: Features ultra-thin and lightweight design, easy to cut, bend and form without cracking for flexible processing.
- Anti-Corrosion: Hot-dip galvanized layer delivers superior corrosion and rust resistance, extending service life.
- Stable Performance: Made of low-carbon steel with stable mechanical performance.
- Fine Surface: Smooth surface with good flatness, suitable for painting, coating and further deep processing.
- Cost Effective: High cost performance with affordable price, ideal for cost-sensitive light-duty projects.
- Save Logistics: Low transportation and installation load due to light weight, saving logistics and labor cost.
30 Gauge Galvanized Steel Usages
- Residential & light commercial roofing and wall cladding.
- HVAC ventilation ducts and air pipe fabrication.
- Home appliance shells and internal component parts.
- Light steel framing, partition panels and ceiling materials.
- General metal stamping, hardware and small fabricated parts.
- Fencing, garden sheds and agricultural lightweight structures.
- Decorative metal trim and construction auxiliary materials.
- Packaging, protective covering and industrial thin-gauge applications.
Premium 30 Gauge GI Steel Manufacturer – WanZhi Steel
Wanzhi Group is an ISO-certified galvanized steel manufacturer based in Boxing County, Binzhou City, Shandong Province, China. The factory owns 3 color-coated steel production lines, 2 galvanized steel production lines and 1 aluminum-magnesium alloy coated production line. We provide one-stop services from raw material supply to production to finished products globally. Our products include GI/GL, PPGI/PPGL, zinc-aluminum-magnesium alloys, aluminum products and stainless steel. All products comply with GB, JIS, EN and other international standards. With an annual production capacity of 600,000 tons, the products have been exported to 120 countries and regions worldwide.
WanZhi Factory
- Galvanizing Lines: Wanzhi Factory is equipped with two galvanizing production lines with zinc coating thicknesses ranging from 30 g to 275 g/m², manufacturing galvanized steel coils and sheets in gauges from 9 to 32. The lines are fitted with high-precision tension control systems and intelligent furnace temperature regulation equipment, ensuring a flat surface and stable performance throughout the production of ultra-thin substrates, without stretching deformation or indentation. Each line has a monthly capacity of 10,000 tons.
- Customization Services: Wanzhi Group offers customized services in terms of dimensions and specifications, metal coating types, surface treatments (such as film lamination, passivation, phosphating, anti-fingerprint treatment and painting), material grades, and export packaging.
- Certificates: Our factory has obtained ISO9001, ISO14001 and ISO45001 certifications. 30 gauge galvanized steel strictly complies with international standards including ASTM A653, with official MTC mill test certificates available. Third-party inspections by SGS, BV, TUV and other authorities are fully supported, and free samples can be provided for customer reference and quality verification.
Quality Inspection
After the production of galvanized steel sheets is completed, our factory conducts a series of strict tests, including thickness measurement, adhesion test, corrosion resistance test, impact resistance test, hardness test, chemical stability test and temperature adaptability test.
Packages & Delivery
We adopt standardized export packaging, consisting of plastic film, moisture-proof paper, galvanized steel sheet, edge protectors and wooden pallets, to effectively prevent moisture and avoid damage during transportation. Meanwhile, customized packaging solutions are available upon customer requirements. We coordinate global logistics to ensure intact and on-time delivery to your factory or project site.
Global Cases
Wanzhi Group’s galvanized and galvalume steel, as well as color coated coils and sheets, have been exported to more than 120 countries and regions, including Libya, Brazil, Saudi Arabia, the UAE, Chile, Colombia, Azerbaijan, Malaysia, Uzbekistan, Turkey and Poland.
Wanzhi Steel – Agricultural Greenhouse Project in Turkmenistan
550 tons PPGI Steel Coil to Azerbaijan
100 tons of Galvanized Coils to Saudi Arabia
144 ton Steel Wire to Spanish
Project of PPGI Roofing en Libya
100 tons of GL and PPGL in Solomon Islands
Customer Reviews
Our product quality, fast delivery and professional one-stop service have won positive feedback from customers all over the world.
Wanzhi supplies galvanized steel sheets and coils with a thickness range of 0.12–4.0 mm and a width up to 1500 mm, providing customized solutions for the global industrial, construction and infrastructure sectors. If you would like to know more about other models and specifications of galvanized steel, please feel free to contact us. Our sales managers will respond to your inquiries promptly.