Galvanised Pipes

Galvanised Pipes


Galvanised pipes are carbon steel pipes that have been dipped in a protective zinc coating to prevent corrosion and rust. The zinc provides a protective barrier against corrosion when exposed to the outdoor environmental elements and indoor humidity. There are two types of galvanised pipe: hot dipped galvanised pipe and cold galvanised pipe. Galvanised pipes are a cheaper alternative to stainless steel pipes, while maintaining comparable strength and protection against rust.


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.


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

Kian Huat Metal

Kian Huat Metal is Singapore’s leading galvanised pipe supplier with a wide distribution network that spans over 20 countries in the Asia Pacific region. With over 30 years of experience, we provide the very best quality products, prompt delivery and highest standard of services at competitive prices. At Kian Huat Metal, we supply an extensive range of metals for various applications. Our inventory includes: stainless steel, structural steel, mild steel, galvanised steel, aluminium, brass, bronze and copper. Our hot rolled and cold rolled steel is available in a wide range of shapes including: bars, rods, universal beams, universal columns, pipes, hollow sections, channels, sheets and plates. We can cut according to your exact specifications.

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We ensure product quality and consistency through best practices and quality control that conform to local and international standards.

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Our highly skilled team of drivers will ensure your orders are delivered within the time requested.

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We offer a competitively priced and extensive range of steel products for all industries.

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