Engineered for superior durability and precise formability, our ASTM A653 galvanized steel strictly adheres to American Society for Testing and Materials standards. BOMIS Steel supplies high-performance commercial and structural grades tailored for global infrastructure, HVAC, and manufacturing projects. With highly customizable zinc coatings ranging from G30 to G90, we deliver the exact corrosion resistance your project demands.
मुख्य विनिर्देश:
Standard Compliance: ASTM A653 / A653M
Thickness: 0.12 mm – 5.0 mm (Strict tolerance control)
Width: 600 mm – 1500 mm (Custom slitting available)
Zinc Coating (Imperial): G30, G40, G60, G90, and beyond.
Available Forms: Coils, Flat Sheets, Slit Strips, and Corrugated Roofing.
Understanding ASTM Zinc Coating Weights (G30, G60, G90)
In the ASTM A653 standard, the zinc coating mass is designated by a “G” followed by a number. But what exactly does this mean for your project?
The “G” Designation: Stands for “Galvanized”, indicating a standard continuous hot-dip zinc coating.
The Numbers (30/60/90): Represent the total double-sided weight of the zinc coating expressed in ounces per square foot (oz/ft²). For instance, G90 means there is 0.90 oz/ft² of zinc applied.
The Rule of Thumb: A higher number signifies a thicker zinc layer, directly translating to enhanced corrosion resistance and a longer lifespan.
Imperial to Metric (ASTM vs. EN) Conversion Guide Since many international markets operate on the metric system (using “Z” for g/m²), we provide this quick conversion reference to help you specify the correct material (Conversion factor: 1 oz/ft² ≈ 305 g/m²):
| ASTM Designation (Imperial) | Coating Weight (oz/ft²) | Metric Equivalent (EN/ISO) | Metric Weight (g/m²) | Typical Application Environment |
| G30 | 0.30 oz/ft² | Z90 | ~90 g/m² | Indoor components, concealed framing, mild environments. |
| G60 | 0.60 oz/ft² | Z180 | ~180 g/m² | General construction, moderate outdoor exposure, ductwork. |
| G90 | 0.90 oz/ft² | जेड275 | ~275 g/m² | Outdoor roofing, harsh weather conditions, industrial use. |
| विशेष विवरण | ASTM A653 Galvanized Steel Details |
| प्रोडक्ट का नाम | Premium ASTM A653 Galvanized Steel (Coil & Sheet) |
| सामग्री ग्रेड | Commercial Steel (CS Type A/B/C), Structural Steel (SS Grades) |
| मानक अनुपालन | एएसटीएम ए653 / A653M |
| जिंक कोटिंग द्रव्यमान | G30, G40, G60, G90 (Custom high-coating weights available upon request) |
| मोटाई सीमा | 0.12 mm – 5.0 mm (Precision thickness tolerance) |
| चौड़ाई सीमा | 600 mm – 1500 mm (Custom edge slitting supported) |
| लंबाई विकल्प | कुंडल: Custom weight / चादर: 2000mm, 2440mm (8ft), 3000mm, or Cut-to-Length |
| स्पैंगल फिनिश | शून्य स्पैंगल, न्यूनतम स्पैंगल, नियमित स्पैंगल, बड़ा स्पैंगल |
| सतह का उपचार | Chromated, Oiled / Unoiled, Passivation, Anti-Fingerprint (AFP) |
| तन्यता ताकत | 270 – 500 MPa (Tested & Certified) |
| मूल्य वर्धित प्रसंस्करण | Precision Slitting, Cut-to-Length, Punching, Roll Profiling |
| न्यूनतम ऑर्डर (एमओक्यू) | 18 Metric Tons (Trial orders supported for new clients) |
| निर्यात पैकेजिंग | Mill Standard Seaworthy Packing (Waterproof kraft paper + steel wrapping + metal strapping) |
| गुणवत्ता आश्वासन | Mill Test Certificate (MTC) provided / Third-party inspection (SGS/BV) welcome |
Cost-Effective Longevity (Maximum ROI) Rather than simply being “low-cost,” our advanced galvanizing process delivers an optimal balance of budget efficiency and extended service life. By significantly reducing long-term maintenance and replacement needs, our steel ensures maximum Return on Investment (ROI) for your projects.
Unwavering Corrosion Resistance Engineered to perform in harsh environments, our uniform zinc coating acts as a robust sacrificial barrier. It instantly forms a dense, impenetrable oxide film that actively isolates the underlying steel from moisture and corrosive media, guaranteeing lasting structural integrity.
High-Yield Structural Strength Available in multiple customized strength grades, our galvanized steel combines exceptional load-bearing capacity with superior toughness. It is meticulously manufactured to withstand severe impacts and demanding mechanical stresses in heavy construction and industrial applications.
Exceptional Workability & Reduced Waste Characterized by outstanding ductility, our steel seamlessly adapts to your manufacturing lines. It confidently handles precision stamping, severe bending, and complex welding operations with minimal risk of cracking—directly reducing your production waste and boosting efficiency.
Pristine & Versatile Surface Finish Aesthetics matter just as much as performance. Featuring a flawlessly uniform zinc layer and high-quality finish, our products are ready for immediate exposed applications. Furthermore, this pristine surface serves as the perfect, high-adhesion substrate for premium color-coated (PPGI) processing.
Construction & Commercial Infrastructure Widely utilized for industrial roofing, heavy-duty wall cladding, light steel keels, and load-bearing purlins. It provides the reliable, long-lasting weather resistance required for modern warehouses, modular container housing, and large-scale granaries.
HVAC & Precision Manufacturing The material of choice for fabricating highly durable air conditioning systems and industrial exhaust ducts. Its excellent formability also makes it ideal for manufacturing robust door and window frames, as well as safe balcony guardrails.
Automotive & Heavy Transportation Relied upon by international automotive manufacturers for stamping high-strength car body panels, protective fuel tank enclosures, and critical chassis components. It also provides the essential framework for heavy-duty truck compartments.
Renewable Energy & Agricultural Structures Seamlessly processed into robust galvanized pipes and structural profiles to support the future of green energy. Our steel is extensively used for solar photovoltaic (PV) brackets, wind turbine bases, and heavy-duty greenhouse framing.
BOMIS Steel: Your Comprehensive Galvanized Solutions Partner
As a premier galvanized steel manufacturer and exporter, BOMIS Steel operates state-of-the-art hot-dip and electro-galvanizing production lines. Backed by advanced processing facilities and a rigorous quality control system, we go beyond supplying raw materials—we deliver precision-engineered steel solutions tailored to global standards.
Our Diverse Galvanized Portfolio Includes:
Galvanized Steel Pipes & Tubes: Engineered for structural integrity and fluid transport.
Galvanized Wire: High-tensile strength for construction and fencing applications.
Galvanized Corrugated Roofing Sheets: Premium weather resistance for industrial and residential roofing.
Galvanized Checker Plates: Anti-slip surfacing for industrial flooring and transportation.
Galvanized Perforated Sheets: Customized punch patterns for architectural and acoustic uses.
Q1: What grades of ASTM A653 galvanized steel can BOMIS Steel supply?
ए: We supply a comprehensive range of material types under the ASTM A653 standard to suit various project requirements. This includes Commercial Steel (CS Type A, B, and C) for general forming, Forming Steel (FS) for deeper draws, and Structural Steel (SS Grades, such as SS33, SS40, SS50) for heavy load-bearing infrastructure.
Q2: What do the zinc coating codes like G30, G60, and G90 mean?
ए: These codes represent the total weight of the double-sided zinc coating in imperial units (ounces per square foot, oz/ft²). For example, G90 means 0.90 oz/ft² of zinc, which is approximately equivalent to Z275 (275 ग्राम/मी²) in European metric standards. The higher the number, the thicker the zinc layer and the stronger the corrosion resistance.
Q3: How do I choose between G60 and G90 coating weights for my project?
ए: It primarily depends on the application environment. G60 (~180 g/m²) is cost-effective and highly recommended for indoor structures, HVAC ductwork, and light framing under mild exposure. G90 (~275 g/m²) provides a much thicker sacrificial barrier, making it the industry standard for outdoor roofing, wall cladding, and coastal/industrial environments prone to severe weathering.
Q4: What are your thickness tolerances and customized size capabilities?
ए: We maintain strict tolerance controls adhering to ASTM A653/A653M specifications. Our thickness ranges from 0.12 mm to 5.0 mm, and width ranges from 600 mm to 1500 mm. Through our मूल्य वर्धित प्रसंस्करण सेवाएँ, we can slit standard coils into precise strip widths or cut them into requested sheet lengths (such as the standard 8ft/10ft sheets).
Q5: How does BOMIS Steel protect A653 sheets and coils from white rust during transit?
ए: Marine transit can be harsh, which is why we apply professional surface treatments like chromating, oiling, or anti-fingerprint (AFP) based on your preference. Furthermore, we implement मिल मानक समुद्र-योग्य पैकेजिंग: products are multi-layered with rust-proof film and heavy-duty waterproof kraft paper, enclosed in galvanized iron sheets, and heavily strapped to prevent any moisture ingress or physical damage.
