Galvanized spiral welded pipe, also known as hot-dip galvanized spiral submerged arc welded steel pipe, is a steel pipe product made by rolling hot-rolled steel strip into a spiral angle, automatically welding it into a spiral welded pipe with double-sided submerged arc welding, and then hot-dip galvanizing it to form a zinc alloy coating on its inner and outer surfaces.
The core advantages of galvanized spiral welded pipe are reflected in the following aspects:
1. Large diameter and high pressure resistance: The unique process advantage of spiral welded pipe, which allows for the production of large-diameter pipes from narrow strip steel, enables it to cover an outer diameter range from 219mm to 3600mm. Under the same pressure conditions, the stress borne by the spiral weld seam is only 75% to 90% of that of straight seam welded pipe.
2. Excellent corrosion resistance: The hot-dip galvanized layer forms a dual mechanism of physical barrier and electrochemical protection on the steel pipe surface. Under normal environments, the rust-proof layer can last for 30 to 50 years without repair.
3. High efficiency of continuous production: Spiral welded pipe can be produced continuously with high metal utilization, making it suitable for mass production.
Strong coating adhesion: Hot-dip galvanizing forms a metallurgically bonded zinc-iron alloy layer, resulting in a uniform, dense coating with excellent adhesion.
Key differences between galvanized spiral welded pipe and galvanized welded steel pipe
Core Performance Characteristics
1. Excellent Corrosion Resistance: The hot-dip galvanized layer forms a dual mechanism of physical barrier and electrochemical protection on the steel pipe surface. Under normal conditions, the hot-dip galvanized anti-rust layer can last for 30-50 years without repair; in urban or near-shore areas, it can last for 15-20 years.
2. Superior Coating Quality: Hot-dip galvanizing forms a metallurgically bonded zinc-iron alloy layer, resulting in a uniform, dense, and strongly adherent coating. The product surface is smooth and white, free of exposed iron, uncoated areas, and drips. It exhibits good elongation and is not easily cracked during deformation processing.
3. Standard Coating Thickness: According to GB/T 3091 standard, the zinc coating thickness of hot-dip galvanized steel pipes is generally above 40μm.
4. High Pressure Bearing Capacity: The stress borne by spiral welds under the same pressure conditions is only 75%-90% of that of straight seam welded pipes. Q235 material products can withstand a hydraulic test pressure of 5MPa for 10 seconds without leakage.
5. Good Mechanical Properties
Taking Q235 material as an example: Yield strength ≥ 235MPa, tensile strength 370～500MPa.
6. Main Limitations
Long weld length: The weld length is more than 30% longer than that of a straight seam welded pipe of the same length. Limited applicable pressure: Mainly suitable for low-pressure fluid transportation scenarios.
The application fields of galvanized spiral welded pipe are very wide.
In the field of construction, it is usually used as one of the main materials for structural support and light steel structure buildings, and can be used to build walls, roofs, floors and other parts. In addition, it can also be used to strengthen the structure of large-scale projects such as buildings and bridges, which plays an important role.
In the field of water and gas transmission, galvanized spiral welded pipe is also a very important pipe. For example, a large number of piping systems need to be installed in the upper and lower sewers, rivers, sewage treatment and gas pipelines, and the corrosion resistance and anti-aging properties of galvanized spiral welded pipes can ensure the long-term stable operation of the piping system.
Galvanized spiral weled pipes are widely used in different fields, and with the continuous progress of industrial technology and the improvement of environmental protection awareness, the quality and performance of galvanized spiral pipes have also been continuously improved. In the future, galvanized spiral welded pipes will continue to play an important role in the construction and industrial fields, creating a better and more comfortable living environment for people.
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