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Galvanized steel pipe is a construction material coated with a layer of zinc on its surface to protect the internal steel structure from corrosion caused by environmental factors. With high durability and superior rust resistance, this material is widely used in civil and industrial projects, firefighting systems, and water supply and drainage systems.
Let’s join DaiDung Group a business with many years of experience in steel structures and mechanical fabrication, divided into 9 main product lines: Industrial Factories; High-rise Buildings; Renewable Energy, Heavy Industry; Fish Farms, Hydro-modules; Shipbuilding, Port modules, Technical modules; Pipes, Tanks, Oil storage tanks; Steel structures for power transmission, telecommunications, hot-dip galvanized steel; and Architectural works to learn more about the standard dimensions of galvanized steel pipe.
Standards and Specifications for Galvanized Steel Pipe Dimensions
The quality and dimensions of galvanized steel pipe are strictly controlled based on international technical standards and national standards (TCVN), ensuring uniformity and safety in use.
The most common standards include:
- BS 1387:1985 (United Kingdom): This standard specifies the composition, nominal dimensions, thickness, and requirements for the zinc coating.
- ASTM (USA): Standards such as ASTM A53, ASTM A123, and ASTM A153 are important legal bases, defining requirements for the galvanized coating, steel structure, and durability testing methods for the product.
- TCVN 197:2002 (Vietnam): A national standard specifying requirements for mechanical properties (like tensile strength, elongation) for steel materials.
- JIS G3444 (Japan): A standard applied to carbon steel structural pipes, including both welded and seamless types.
Common Specification Table for Galvanized Steel Pipe Dimensions
Below is a table of common specifications for galvanized steel pipe used in construction, mechanical engineering, and other industries. Galvanized steel pipes are typically manufactured according to standards like BS 1387-1985, JIS G3444, JIS G3466, and ASTM, and come in a wide variety of diameters and thicknesses suitable for many purposes.
Dimension Table for Round Galvanized Steel Pipe (Common)
| Outside Diameter (mm) | Common Thickness (mm) | Length per Pipe (m) |
| 21.2 | 1.4 – 2.0 | 6 |
| 26.65 | 1.4 – 2.5 | 6 |
| 33.5 | 1.4 – 2.8 | 6 |
| 42.2 | 1.4 – 3.2 | 6 |
| 48.1 | 1.4 – 3.2 | 6 |
| 59.9 | 1.4 – 3.2 | 6 |
| 75.6 | 1.6 – 3.6 | 6 |
| 88.3 | 1.8 – 4.0 | 6 |
| 113.5 | 2.0 – 4.5 | 6 |
| 126.8 | 2.0 – 5.0 | 6 |
Dimension Table for Galvanized Square and Rectangular Steel Tube (Reference)
| Dimensions (mm) | Common Thickness (mm) | Length per Tube (m) |
| 14×14 | 0.8 – 2.0 | 6 |
| 20×20 | 0.8 – 2.5 | 6 |
| 30×30 | 1.0 – 2.5 | 6 |
| 40×40 | 1.2 – 3.0 | 6 |
| 50×50 | 1.2 – 3.5 | 6 |
| 20×40 | 1.0 – 2.5 | 6 |
| 40×80 | 1.0 – 3.0 | 6 |
| 50×100 | 1.2 – 3.5 | 6 |
Note: The dimension tables above are for common reference, based on BS 1387:1985, ASTM, and TCVN standards.
Hot-Dip Galvanizing Technology
Hot-Dip Galvanizing is the process of coating steel or iron surfaces with zinc by completely immersing the product in a bath of molten zinc at a temperature of about 420°C. When the steel is removed and cooled, the zinc layer adheres firmly, creating a durable protective film that prevents oxidation and provides superior corrosion resistance compared to common electro-galvanizing methods.
The international standard ASTM A123 strictly regulates the technical requirements for hot-dip galvanized products, such as:
- Zinc coating thickness according to the material type.
- Inspection of appearance, adhesion, coating weight, and mechanical properties.
- The surface treatment process includes degreasing, rust removal (pickling) with acid, and rinsing before immersing the product in the molten zinc bath, ensuring maximum effectiveness in protecting the material from corrosive agents and extending its service life.
As a result, hot-dip galvanized steel pipe products achieve stable quality, suitable for applications in harsh environmental conditions, ensuring safety for large-scale steel structures both domestically and internationally.
Practical Applications by Size Range
Depending on their diameter and thickness, galvanized steel pipes are used for different purposes:
- Small sizes (DN15 – DN50): Suitable for building water supply and drainage systems, domestic water pipes, firefighting systems, and other civil projects.
- Medium & Large sizes (DN65 and up): Used primarily in the energy industry (oil and gas pipelines), factory and workshop structures, and large-scale, load-bearing infrastructure systems.
DaiDung Group – A Supplier of International-Standard Galvanized Steel
DaiDung Group is one of Vietnam’s leading brands in the steel structure sector, including galvanized steel pipe and hot-dip galvanized products that meet international standards. Throughout more than 30 years of development, DaiDung Group has built a system of modern, large-scale factories with the capacity to produce oversized and overweight steel pipes and structures serving diverse industries, from manufacturing to renewable energy and international infrastructure projects.
DaiDung Group’s products affirm their outstanding advantages in mechanical strength, corrosion resistance, and superior longevity thanks to the application of modern hot-dip galvanizing technology. The products undergo strict quality control, meeting rigorous standards such as ASTM, BS, JIS, and TCVN simultaneously, allowing them to be supplied to a series of key projects in over 60 countries worldwide.
Below is a list of typical domestic and international projects in which DaiDung Group has participated as a manufacturer, supplier, and installer of steel structures, galvanized steel pipes, or other specific steel components:
- Powerhouse Parramatta Museum (Australia)
- MISK ILMI Science and Technology Museum (Riyadh, Saudi Arabia)
- Stadium 974 in Qatar (World Cup 2022)
- Hanoi National Exhibition and Convention Center
- Saigon Exhibition & Convention Center (SECC II)
- Taiwan Offshore Wind Farm Project
- Shiplift System Floor Project (USA)
- Saigon River Pedestrian Bridge Project
- Long Thanh Airport (Vietnam)
- Kim Long Motor Automobile Production and Assembly Plant (Hue)
- Hoa Thang 2.2 Wind Power Plant
- Nhon Trach 3 & 4 LNG Power Project
- Nghi Son 2 Thermal Power
- UKUDU Thermal Power Plant
- Dak-Ba Hydropower Plant
- Canada Mining Plant
- EACOP – East African Crude Oil Pipeline
Furthermore, DaiDung Group continuously invests in expanding its production lines with modern, highly automated processes, focusing on developing multi-sized galvanized steel pipe products according to international standards to serve the diverse needs of domestic and foreign customers.
The integration of ISO quality management, carbon emissions control, and a focus on sustainable development helps DaiDung Group maintain its position as a leading brand in Vietnam’s steel structure and galvanized steel pipe industry on the international market today.
DAIDUNG CONSTRUCTION TRADING MECHANICAL JOINT STOCK COMPANY
Address: Lot 38, Area C, D1 Street, An Ha Industrial Park, Tan Vinh Loc Commune, Ho Chi Minh City, Vietnam
Office: 121 – 123 Bach Dang, Tan Son Hoa Ward, Ho Chi Minh City.
Phone: +84 28 3868 1689
Fax: +84 28 3845 2397