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Coated Steel Pipe
Galvanized Steel Pipe
Wall Thickness: 0.6mm-12mm or customized
Length: 5.5m-12m or customized
Outer Diameter: 0.3mm-300mm or customized
Tolerance: Wall thickness: ±0.05MM; Length: ±6mm; Outer diameter: ±0.3MM
Shape: Round, square, rectangle, oval, deformed
Technique: Cold rolled, hot rolled, ERW
Surface Treatment: Black annealing, bright annealing, none annealing
Application: Widely used in furniture,interior decoration, fluid pipeline, petroleum and natural gas industry, drilling, pipeline, structure
Specification
Galvanized steel pipe is a welded steel pipe with a hot-dip or electro-galvanized layer on the surface. Galvanizing can increase the corrosion resistance of steel pipes and prolong their service life. Galvanized pipes are widely used. In addition to being used as pipeline pipes for general low-pressure fluids such as water, gas, and oil, they are also used as oil well pipes and oil pipelines in the petroleum industry, especially offshore oil fields, and oil heaters and condensation pipes for chemical coking equipment.
APPLICATIONS
Uses of galvanised pipe include general fabrication, manufacturing, frames, construction, water and sewer lines, chemical processing, steel scaffolding, sprinkler and irrigation systems and automotive industry.
TYPES
Galvanised pipe can be grouped into 3 categories: Allied flo-coat pipe, pre-galvanised pipe and Schedule 40 hot dipped galvanised pipe. Details of these types are as following:
Type |
Description |
Allied Flo-Coat Pipe |
Cold formed, welded with high frequency and hot-dipped galvanization. Produced in accordance with ASTM A1008/A1008M and A1011/A1011M standards with a minimum productivity strength of 30,000 psi. |
Pre-Galvanised Pipe |
Cold formed and welded with radio frequency pre-galvanized steel strip. Pre-galvanized steel needs to conform to ASTM A446 standard. |
Schedule 40 Hot Dip Galvanised Pipe |
Not covered by any specification. Outside diameter and the wall thickness are defined by other specifications as for non-galvanised pipes. Typically hot formed and butt welded, or cold formed and high frequency welded. |
COMMON SIZES AND SPECIFICATIONS
Nominal Inner Diameter |
Outer Diameter |
Wall Thickness |
Length |
DN15 |
21.3mm |
2.8mm |
Up to 6000mm |
DN20 |
26.9mm |
2.8mm |
Up to 6000mm |
DN25 |
33.7mm |
3.2mm |
Up to 6000mm |
DN32 |
42.4mm |
3.5mm |
Up to 6000mm |
DN40 |
48.3mm |
3.5mm |
Up to 6000mm |
DN50 |
60.3mm |
3.8mm |
Up to 6000mm |
DN65 |
76.1mm |
4mm |
Up to 6000mm |
DN80 |
88.9mm |
4mm |
Up to 6000mm |
DN100 |
114.3mm |
4mm |
Up to 6000mm |
DN125 |
140mm |
4.5mm |
Up to 6000mm |
DN150 |
168.3mm |
4.5mm |
Up to 6000mm |
DN200 |
219.1mm |
6mm |
Up to 6000mm |
DN200 |
219.1mm |
6.5mm |
Up to 6000mm |
Other galvanised pipe sizes are available upon request. You can request to cut your galvanised pipe down to size.
MECHANICAL PROPERTIES
Properties |
Flo-Coat Process |
Pre-Galvanised |
Hot Dip (Schedule 40) |
Bright Finish |
Excellent |
Fair |
Poor |
Uniform Finish |
Excellent |
Good |
Poor |
Formability |
Excellent |
Good |
Poor |
Paint Adhesiveness |
Excellent |
Fair |
Poor |
Weldability |
Excellent |
Good |
Fair |
Interior Corrosion Resistance |
Excellent |
Poor |
Good |
Exterior Corrosion Resistance |
Excellent |
Fair |
Good |
Yield Strength |
Excellent |
Good |
Fair |
Process
2. Dipping Phase into Molten Zinc
3. Cooling, Finishing, and Drying
4. Quality Control