Zinc Coated Galvanized Steel Pipe


Zinc coated galvanized steel pipes are a type of steel pipe that have been coated with a layer of zinc to help prevent corrosion. The process of galvanizing involves the application of a zinc layer to a steel pipe through either hot-dip galvanization or electro-galvanization.

Hot-Dip Galvanization

In the hot-dip galvanization process, the steel pipe is dipped into a bath of molten zinc. This process allows the zinc to form a metallurgically bonded coating that is highly resistant to wear and weathering. The thickness of the zinc layer can be controlled by the duration of immersion in the bath and the thickness of the original steel.


Thickness 1-200mm;or as required Length: 2000-16000mm,or as required
Dimensions 16-1020mm;(1/2inch~40inch)Dimensions Technique Hot Rolled Or Cold Rolle
Zinc Coating pre galvanized steel pipe: 60-150g/m2
hot dipped galvanized steel pipe:200-460g/m2
Surface treatment Cold galvanizing,Hot dip galvanized
Certification: CE, ISO, SGS,BV,Mill Certificate Standard: ASTM,JIS,GB,DIN,EN
price terms FOB,CRF,CIF,EXW, CPT Payment Terms T/T, L/C at sight,West Union
Grade Q195—Grade B, SS330, SPC, S185
Q215—Grade C,CS Type B, SS330, SPHC,
Q235—Grade D, SS400, S235JR, S235JO, S235J2,
Q345—SS500, ST52,S355JR
Delivery Detail Standard has Stock;  Normal About 3-5days; Custom-made 15-20days;According to order’s quantity.
Packing standard export packing (inside:water proof paper,outside:fumigated wooden box)
Hexagon Shape Bundle, Covered With Tarpaulin, Containers Or In Bulk

hot-dip/cold galvanized steel pipe specification

regulation grid OD


Wall thickness mm Minimum wall Welded pipe

( 6 m fixed length)

Galvanized pipe

( 6 m fixed length)

Nominal inner diameter inch   Thick mm Meter weight kg Root weight kg Meter weight kg Root weight kg
DN15 1/2 21.3 2.8 2.45 1.28 7.68 1.357 8.14
DN20 3/4 26.9 2.8 2.45 1.66 9.96 1.76 10.56
DN25 1 33.7 3.2 2.8 2.41 14.46 2.554 15.32
DN32 1.25 42.4 3.5 3.06 3.36 20.16 3.56 21.36
DN40 1.5 48.3 3.5 3.06 3.87 23.22 4.1 24.6
DN50 2 60.3 3.8 3.325 5.29 31.74 5.607 33.64
DN65 2.5 76.1 4 3.5 7.11 42.66 7.536 45.21
DN80 3 88.9 4   8.38 50.28 8.88 53.28
DN100 4 114.3 4   10.88 65.28 11.53 69.18
DN125 5 140 4.5   15.04 90.24 15.942 98.65
DN150 6 168.3 4.5   18.18 109.08 19.27 115.62
DN200 8 219.1 6 (welded pipe)   31.53 189.18    
DN200 8 219.1 6.5 hot-dip galvanizing       36.12 216.72

GB / T 3091-2001 hot-dip galvanized pipe wall thickness deviation



Chinese standard Enterprise standard Contrast conclusion
Low pressure fluid conveying welded steel pipe Welded steel pipe
GB/T3091-2001 Q/YF01-2002
1 Steel pipe outer diameter Steel pipe outer diameter,

outer diameter allowable deviation

Better than Chinese standards
Outer diameter D/mm Tube outer diameter deviation mm Tube outer diameter

Deviation mm

Outer diameter D 8″ ± 0.60mm
D< 48.3 ± 0.5mm   5″-6″ ± 0.50mm
48.3<D <


± 1.0%   4″ ± 0.40mm
168.3<D <


± 0.75% +2.4 -0.8 3″-“ ± 0.30mm
D>508 ± 1.0% +3.0 -0.8 2″ or less ± 0.20mm
Wall thickness deviation ± 12.5% Wall thickness S 1.8


2 Usual length Allowable deviation length Usual length Allowable deviation Better than Chinese standards
4M-12M +20 -0 2 inches or less 5-0
Double length: 5-10mn ® should be

left for each double in the usual length


+20 -0 2.5 inches – 4 inches 5-0
5 inches or more 15-0
Special length 20-0



Electro-galvanization, on the other hand, uses electrical current to deposit the zinc onto the surface of the steel. This process provides a more uniform coating and allows for better control over the thickness of the zinc layer. However, electro-galvanized pipes may not be as durable as hot-dip galvanized pipes, especially in harsh environmental conditions.

Advantages of Zinc Coated Galvanized Steel Pipes

  1. Corrosion Resistance: The zinc coating provides a barrier between the steel and the environment, preventing the corrosion that would otherwise occur when the steel is exposed to air and moisture.
  2. Long Lifespan: Because of their corrosion resistance, galvanized steel pipes can have a long service life, often up to 50 years in rural environments and 25 years in more severe urban and coastal environments.
  3. Low Maintenance: Once the galvanized steel pipes are installed, they require little maintenance because the zinc coating is very durable.
  4. Toughness: The galvanization process makes the pipes more durable and tough, which can be an advantage in applications where the pipes may be exposed to mechanical damage.

Applications of Zinc Coated Galvanized Steel Pipes

Galvanized steel pipes are used in a variety of applications, including:

  • Plumbing: They are often used for carrying water in both residential and commercial buildings.
  • Construction: Galvanized steel pipes are used in construction for a variety of purposes, including scaffolding, fencing, and as structural elements in buildings.
  • Industrial Applications: In industries, these pipes are used for transporting substances like gases, combustible fluids, and corrosive chemicals.
  • Agriculture: They are used in irrigation systems, greenhouses, and other agricultural structures.

In conclusion, zinc coated galvanized steel pipes are a popular choice for many applications due to their corrosion resistance, durability, and long lifespan. However, they must be used appropriately as they are not suitable for transporting certain types of materials, like highly acidic or alkaline substances, because these can corrode the zinc layer.

Standard: ASTM A53, BS1387-85, GB/T3091-08, DIN2440, JIS-G3444, EN10240, EN10255

Grade: Q195, Q215, Q235, Q345, S235JR, S275JR, STK400, STK500

API SPEC 5L — Specification for Line Pipe

ASTM A53/A53M — Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A500 — Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes

BS 1387 — Specification for screwed and socketed steel tubes and tubulars and for plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads

BS 1139 — Metal scaffolding. Specification for prefabricated mobile access and working towers

EN 39 — Loose steel tubes for tube and coupler scaffolds

EN 10255 — Non-alloy steel tubes suitable for welding and threading

Welded pipe inspection – pickling – washing – coating solvent – aligning – drying – hot galvanizing – external blowing – internal blowing – water cooling – intermediate inspection – passivation – drying – typing – packaging – final inspection



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