1. Definition of DN80 galvanized steel pipe
DN80 galvanized steel pipe refers to a galvanized steel pipe with an outer diameter of 80 mm and a wall thickness of 3.5 mm. It is a medium-sized steel pipe, mainly used for transportation and structural purposes in industries such as liquids, gases, petroleum, chemicals, shipbuilding, and machinery.

2. Standards for DN80 galvanized steel pipes
There are two standards for DN80 galvanized steel pipes: domestic standards and international standards. The domestic standards are mainly GB/T 3091-2015 “Welded Steel Pipe” and GB/T 13793-2016 “Long Straight Welded Seam Steel Pipe”. The international standards are mainly ASTM A53, BS1387, EN10255, DIN2440, etc. These standards have specific provisions for the material, chemical composition, mechanical properties, size, weight, and marking of DN80 galvanized steel pipes, ensuring the quality and use of the steel pipes.

3. Size range of DN80 galvanized steel pipe
The size range of DN80 galvanized steel pipe is determined according to national and international standards. According to the domestic standards GB/T 3091-2015 “Welded Steel Pipe” and GB/T 13793-2016 “Long Straight Welded Seam Steel Pipe”, the size range of DN80 galvanized steel pipe is as follows:
Outer diameter: 76.1~81.0 mm
Wall thickness: 3.0~3.5 mm
Length: generally 6 meters, and can also be customized according to user requirements.

4. Advantages and disadvantages of DN80 galvanized steel pipe
The advantages of DN80 galvanized steel pipe are good corrosion resistance, corrosion resistance, long service life, low cost, convenient construction, etc.; the disadvantages are heavy weight and easy to rust. However, after galvanizing, its corrosion resistance has been greatly improved, which can effectively avoid rust and corrosion of steel pipes and ensure service life.

5. Application fields of DN80 galvanized steel pipes
DN80 galvanized steel pipes are widely used in construction, transportation, petroleum, chemical industry, metallurgy, machinery, aerospace, and other industries. They are mainly used to transport water, gas, oil, steam, and other media. They can also be used to make bridges, building structures, mechanical parts, etc.

In short, DN80 galvanized steel pipe is a commonly used type of steel pipe with good corrosion resistance and long service life. It is one of the preferred materials for transportation and structural purposes in various industries.