Hot-Dip Galvanized Pipe

Hot dip galvanized pipe (HDG) is a very popular steel pipe as the galvanizing process extends the lifespan of the pipes, providing excellent corrosion resistance compared to the general steel ones. COTCO METAL WORKS ensures that every step of the production process meets international standards.

Hot Dip Galvanized Pipe CCM By COTCO

Hot dip galvanized pipe has been coated with a protective layer of zinc to prevent corrosion and rust. There are three main tinge colors: yellow tinge (BS-S), blue tinge (BS-M), and red tinge (BS-H). However, the green tinge can also be seen as a special type.

What is the difference between red, yellow, and blue tinge?

  • The red tinge is the thinnest pipe of all three, commonly used to drain buildings or general offices. 
  • The yellow tinge is similar to the red one in terms of usage but thicker.
  • The blue tinge is the thickest pipe, commonly used to drain water under the ground.

Product Description

Hot dip galvanized pipe is a round steel pipe coated with galvanized. It started by using a hot-rolled coil through the process of slitting, forming pipes, and then dipping into a galvanized bath which consisting of a minimum of 98.5% pure molten zinc. The bath temperature is maintained at about 450 C°. In general, the thickness of the zinc coating is at least 320 gm/m² and will be increased according to the thickness of the metal (Based Metal)

The specifications of hot dip galvanized steel pipe are resistance to atmospheric corrosion and rust and electrochemical and physical protection. This steel pipe is used for a wide variety of applications that require advanced corrosion protection, for instance, outdoor near the sea, irrigation pipes, water pipes, and electrical applications. Moreover, it also can be used for flower-pot hangers in the nursery and structural forming works that require high durability, ease of installation, and prevent corrosion of the steel.

The Scope Of Work for Hot-Dip Galvanized Pipe
• OD: ½” – 8”
• Thickness: 1.4 – 8.1 mm
• Pipe Type: Smooth Edge & Threaded Edge
• Coated: Galvanizing

Industrial Standards for Hot Dip Galvanized Pipe

Hot dip galvanized pipe from CCM By COTCO has received various international standards and has been certified by several agencies, including the Thai government, ensuring that our steel products are qualified. Here are the following standards we received:

Industrial Standards

  • BS 1139
  • TIS 277-2532
  • ASTM A53 Type E Grade A and Grade B
  • DIN 2440
  • JIS G3452
  • BS 1387:1985
  • UL 852 Standard for Safety for Metallic Sprinkler Pipe for Fire Protection Service
  • BS EN 10255
Normal Size OD Thickness Weight
inch mm. mm. max mm. kg/m
½ 15 21.0 21.8 2.6 1.12
¾ 20 26.5 27.3 2.6 1.56
1” 25 33.2 34.2 3.2 2.41
1 ¼ “ 32 42.0 42.9 3.2 3.10
1 ½ “ 40 47.9 48.8 3.2 3.56
2” 50 59.7 60.8 3.6 5.03
2 ½ “ 65 75.3 76.6 3.6 6.42
3” 80 88.0 89.5 4.0 8.36
4” 100 113.1 115.0 4.5 12.20
5” 125 138.5 140.8 5.0 16.60
6” 150 163.9 166.5 5.0 19.80
8” 200 216.9 221.3 8.2 36.80

Tolerance on Outside Diameter and Wall Thickness

Dimension Tolerances
Tensile Strength Min 320 Mpa.
Elongation Min 20%
Thickness -12.50% : ± Not Limit
Weight -8% : +10%


What are Hot Dip Galvanized Pipes used for?

Hot dip galvanized pipes are suitable for a wide range of applications, including plumbing, water supply, irrigation, construction, wiring outside buildings, and various structural molding work. They can be used both indoors and outdoors.

Hot dip galvanized pipes also have a high tensile strength, enabling them to become the ideal material for applications that require strong and reliable pipes, such as connecting the drainage pipe underground or an area subject to strong pressure and vibration.

With the outstanding property of hot dip galvanized pipes, which is the ability to withstand rust corrosion well, they are suitable to be utilized near sea areas or industrial areas with high acidity and alkaline conditions.

The production process of Hot Dip Galvanized Pipes

The hot-dip galvanizing technique consists of three main stages: surface preparation, galvanizing, and inspection. The specifications for the process are determined based on ASTM International standard specifications for hot-dip galvanizing of iron and steel products.

The production process of Hot Dip Galvanized Pipes

Order high-quality Hot Dip Galvanized Pipes from CCM by COTCO

For anyone who would like to ask for additional information, or order high-quality hot dip galvanized pipes from CCM by COTCO, don't hesitate to contact us through these:.

Line Official (LINE ID): @cotcometalworks
Call Center: 02-285-2700
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