Hot Dipped Galvanized Iron Steel Tubes & Pipes
Hot-dipped galvanized iron steel tubes and pipes are those pipes that have been coated with zinc through a process called Hot-Dip Galvanization (HDG)
Process:
The pipes are cleaned and then immersed in a bath of molten zinc at around 860°F (460°C). The zinc alloys with the metal, forming a metallurgical bond. After it is fully coated, it is lifted back up and exposed to the atmosphere. This exposure will make the zinc react to oxygen, creating zinc oxide.
The pipes are cleaned and then immersed in a bath of molten zinc at around 860°F (460°C). The zinc alloys with the metal, forming a metallurgical bond. After it is fully coated, it is lifted back up and exposed to the atmosphere. This exposure will make the zinc react to oxygen, creating zinc oxide.
Appearance:
The zinc forms a crystalline pattern on the surface, sometimes called “spangle”.
The zinc forms a crystalline pattern on the surface, sometimes called “spangle”.
Benefits:
The zinc coating protects the pipes from corrosion, and the material can be used in high-temperature applications.
The zinc coating protects the pipes from corrosion, and the material can be used in high-temperature applications.
Applications:
They are used in a variety of industrial applications, including water supply and distribution systems, plumbing and drainage, fire sprinkler systems, and more.
They are used in a variety of industrial applications, including water supply and distribution systems, plumbing and drainage, fire sprinkler systems, and more.
Comparison to pre-galvanized:
They are more expensive than pre-galvanizing and it has a longer life span and offers more resistance to corrosion.
They are more expensive than pre-galvanizing and it has a longer life span and offers more resistance to corrosion.
Round Pipes
IS: 1161: 2014
TOLERANCES:
a) Outside diameter:
| Up to and including: 48.3 mm – 0.8 mm | + 0.4 mm |
| Over 48.3 mm | ± 1% |
b) Thickness (for all sizes):
| Welded tubes: | ± 10 percent |
c) Weight
| Single tube: | ± 10 percent |
| 10 tonne lots: | ± 7.5 percent |
IS:1239:2004
TOLERANCES:
a) Outside diameter:
| Light Tubes | +not limited -8% |
| Medium and Heavy | +not limited -10% |
b) Weight:
For qualities per load of 10
tones minimum (Medium & Heavy series)± 7.5%
| Single Tubes (Light series) | ± 10 -8% |
| Single Tubes (Medium and Heavy series) | ± 10% |
| For qualities per load of 10 tones minimum (Light series) | ± 7.5% -5% |
c) Length unless otherwise specified 4 to 7 meters
IS 3601:2006
TOLERANCES:
The tolerance on thickness excluding the weld shall be ±10 percent.
Square Pipes
IS:4923:2017
| GRADE | OUTSIDE DIMENSION | THICKNESS | SQUARENESS | CORNER RADIUS | WEIGHT INDIVIDUAL LENGTHS | WEIGHT ON LOT OF 10 MT | CUSTOMIZED OFFER |
|---|---|---|---|---|---|---|---|
| YSt-210 YSt-240 YSt-310 YSt-355 |
±1% with a minimum of ±0.50mm | ±7.5% | 90deg. ±2deg. | 3t max | -8%, +10% | ±7% | Length -4M to 12M |
Rectangular Pipes
IS 4923:2017
| GRADE | OUTSIDE DIMENSION | THICKNESS | SQUARENESS | CORNER RADIUS | WEIGHT INDIVIDUAL LENGTHS | WEIGHT ON LOT OF 10 MT | CUSTOMIZED OFFER |
|---|---|---|---|---|---|---|---|
| YSt-210 YSt-240 YSt-310 YSt-355 |
±1% with a minimum of ±0.50mm | ±7.5% | 90deg. ±2deg. | 3t max | -8%, +10% | ±7% | Length -4M to 12M |
