Galvanized Pipes for Water are carbon steel pipes coated with a zinc layer through hot-dip galvanizing, ensuring corrosion resistance and safety for water transport applications. Compliant with ASTM A53 and A123 standards, these pipes are ideal for potable water supply, irrigation systems, and fire sprinkler systems, offering a minimum tensile strength of 415 MPa and a zinc coating thickness of at least 1.5 oz/ft² (458 g/m²).

The galvanizing process involves cleaning and immersing steel pipes in molten zinc at approximately 450°C (842°F), creating a metallurgical bond that protects against rust. Available in sizes from DN15 (1/2”) to DN200 (8”) with wall thicknesses from SCH 40 to SCH 80, and lengths from 5.8 to 12 meters, Galvanized Pipes for Water meet diverse project needs. Surface treatments like passivation enhance longevity, and threaded or plain ends facilitate easy installation in plumbing systems.

These pipes undergo rigorous testing, including tensile, hydrostatic, and coating thickness tests, to ensure compliance with ASTM standards and suitability for potable water. The zinc coating acts as a sacrificial anode, protecting the steel even if scratched, making Corrosion-Resistant Water Pipes ideal for humid and corrosive environments. Their strength supports high-pressure applications in water treatment plants and construction water lines.

Compared to PVC or stainless steel pipes, Galvanized Pipes for Water offer a cost-effective solution with robust corrosion resistance, though they may require maintenance in highly acidic water conditions. Their lifespan (up to 50 years) and compliance with NSF/ANSI 61 standards for potable water make them a reliable choice for water-related applications.

Galvanized Pipes for Water address challenges like pipeline corrosion, water safety, and durability, delivering long-lasting solutions for residential, agricultural, and industrial water systems.

Galvanized Water Pipe & Steel Plumbing

Galvanized Water Pipe

Galvanized water pipes are made of iron or steel that has a thin protective coating of zinc.

They are durable and have a life expectancy of 50-70 years. However, their popularity began to decline in the 1960s when more lightweight and inexpensive plastic pipes entered the market.

Why Are Water Pipes Galvanized

Water pipes are galvanized to prevent rusting. The benefit of zinc is that it is slow to oxidize. Even the thin layer that coats galvanized water pipes is enough to protect the iron or steel from rust for decades. Without the zinc, iron and steel can start to rust within a year or two.

Galvanized Pipe Corrosion

Galvanized water pipe corrosion is most often caused by years of calcium and magnesium build-up. If caught early enough, corrosion can be cleared away with plumbing-grade hydro-jet or sandblasting equipment. Cleaning the inside of pipes every few years is a good preventive practice. It can extend the life of galvanized and other water pipes by up to a decade per cleaning.

Properties of Galvanized Pipe for Water

The properties of galvanized steel are a unique combination that make it ideal for use in interior and exterior applications such as car bodies, appliances, nuts and bolts, roofs, and rebar.

Corrosion Resistance
Surface Appearance
Formability
Durability
Recyclable

Galvanized Pipe for Water Standard Specifications

Chemical Composition of Galvanized Pipe for Water
Grade	C (% max)	Mn (% max)	P (% max)	S (% max)	Cu (% max)
Grade A	0.25	0.95	0.05	0.045	0.40
Grade B	0.30	1.20	0.05	0.045	0.40

The zinc coating (80-100 microns) enhances the corrosion resistance of Galvanized Pipe for Water , protecting the carbon steel base in harsh environments. The chemical composition ensures weldability and durability for

Mechanical Properties of Galvanized Pipe for Water
Grade	Tensile Strength (min, MPa)	Yield Strength (min, MPa)	Elongation (min, %)
Grade A	330	205	28
Grade B	415	240	30

These properties ensure Galvanized Pipe for Water eliver robust performance in structural and high-pressure applications.

Comparison of Hot-Dip Galvanized Pipes with Other Pipes
Feature	Hot-Dip Galvanized Pipe	Pre-Galvanized Pipe	Stainless Steel Pipe
Coating	Zinc (80-100 microns)	Zinc (thinner, coil-coated)	None (inherent corrosion resistance)
Corrosion Resistance	Excellent (sacrificial anode)	Moderate (weaker at welds)	Superior (no coating needed)
Cost	Cost-effective	Lower initial cost	Higher cost
Lifespan	Up to 50 years	20-30 years	50+ years
Applications	Water, gas, construction	Light structural, fencing	Chemical, marine, hygienic

Hot-Dip Galvanized Pipes offer distinct advantages over pre-galvanized and stainless steel pipes.

Chemical Composition of Stainless Hollow Sections (Grades 304, 304L, 316, 316L per ASTM A554/A312)
Grade	C (% max)	Mn (% max)	Si (% max)	P (% max)	S (% max)	Cr (%)	Ni (%)	Mo (%)	N (% max)
304	0.08	2.00	1.00	0.045	0.030	18.0-20.0	8.0-11.0	-	0.10
304L	0.03	2.00	1.00	0.045	0.030	18.0-20.0	8.0-12.0	-	0.10
316	0.08	2.00	1.00	0.045	0.030	16.0-18.0	10.0-14.0	2.0-3.0	0.10
316L	0.03	2.00	1.00	0.045	0.030	16.0-18.0	10.0-14.0	2.0-3.0	0.10

The low carbon content in 304L and 316L enhances weldability, while molybdenum in 316 and 316L improves resistance to pitting and crevice corrosion, making Galvanized Pipe for Water ideal for harsh environments.

Mechanical Properties of Stainless Hollow Sections (Grades 304, 304L, 316, 316L per ASTM A554/A312)
Grade	Tensile Strength (min, MPa)	Yield Strength (min, MPa)	Elongation (min, %)	Hardness (max, HB)	Hardness (max, HRB)
304	515	205	40	201	92
304L	485	170	40	201	92
316	515	205	40	217	95
316L	485	170	40	217	95

These mechanical properties make Galvanized Pipe for Water suitable for applications requiring high strength and corrosion resistance, such as architectural structures, marine environments, and chemical processing.