Anti-corrosion Coating

SUNNYSTEEL

Anti-corrosion Coating

Anti-corrosion steel pipe refers to the steel pipe that can effectively prevent or slow down the corrosion phenomenon of chemical or electrochemical reaction in the process of transportation and use after anti-corrosion process.

Anti-corrosion steel pipes undergo an anti-corrosion process to protect against chemical or electrochemical reactions that cause rust and degradation. The process involves applying coatings such as zinc (galvanizing), 3LPE, FBE, or coal tar epoxy, which act as barriers against moisture, chemicals, and environmental factors. These pipes, often made via ERW or seamless processes, are ideal for applications in oil and gas pipelines, water supply, and construction.

Anti-corrosion steel pipes offer robust, long-lasting solutions for demanding industrial applications, protecting against corrosion and wear.

Anti-Corrosion Pipes are steel pipes coated with protective layers, such as zinc or epoxy, to resist rust and degradation in harsh environments. Compliant with ASTM A53, A123, and ISO 1461 standards, these pipes are ideal for oil and gas pipelines, water supply systems, and chemical processing plants, offering a minimum tensile strength of 415 MPa and a zinc coating thickness of at least 1.5 oz/ft² (458 g/m²) for galvanized variants.

The anti-corrosion process typically involves hot-dip galvanizing or applying coatings like 3LPE (three-layer polyethylene) or FBE (fusion-bonded epoxy). Galvanizing immerses steel pipes in molten zinc at ~450°C (842°F), forming a metallurgical bond, while epoxy coatings are applied via electrostatic spraying. Available in sizes from DN15 (1/2”) to DN600 (24”) with wall thicknesses from SCH 40 to SCH 160, and lengths up to 12 meters, Corrosion-Resistant Pipes meet diverse project needs. Surface treatments like passivation or varnish enhance longevity, and threaded or beveled ends ensure easy installation.

These pipes undergo rigorous testing, including tensile, hydrostatic, and coating adhesion tests, to ensure compliance with industry standards. The protective coatings act as barriers or sacrificial anodes, making Anti-Corrosion Pipes suitable for marine structures and power plant piping. Their robust design supports high-pressure and corrosive fluid transport in industrial cooling systems and chemical plants.

Compared to uncoated steel or stainless steel pipes, Anti-Corrosion Pipes offer a cost-effective solution with excellent corrosion resistance, though they may require periodic inspection in extreme conditions. Their lifespan (up to 50 years for galvanized, 30-40 years for epoxy-coated) makes them a reliable choice for demanding applications.

Anti-Corrosion Pipes address challenges like pipeline corrosion, chemical exposure, and environmental degradation, delivering durable, long-lasting solutions for industrial and infrastructure projects.

Comparison of Anti-Corrosion Pipes with Other Pipes
Feature	Anti-Corrosion Pipe	Uncoated Steel Pipe	Stainless Steel Pipe
Coating	Zinc or epoxy (80-100 microns)	None	None (inherent resistance)
Corrosion Resistance	Excellent (coating-dependent)	Poor (prone to rust)	Superior (no coating needed)
Cost	Cost-effective	Lowest cost	Highest cost
Lifespan	30-50 years	10-20 years	50+ years
Applications	Oil, gas, water, chemical	Low-corrosion environments	Chemical, marine, hygienic

Anti-Corrosion Pipes offer distinct advantages over uncoated steel and stainless steel pipes.

The Importance of

Anti-Corrosion Coatings for Carbon Steel Pipes

When it comes to transporting precious natural resources or other essential products, the integrity of the pipes used plays a pivotal role.

Carbon steel pipes, widely utilized in various industries, are susceptible to corrosion over time. This is where anti-corrosion coatings step in as the frontline defense, ensuring the longevity and reliability of the pipes.

Anti-corrosion steel pipe is processed through the preservation process, which can effectively prevent or slow down the process in the transport and use of chemical or electrochemical corrosion reaction of steel pipe.

Anti rust process

Some anti-corrosion methods include painting, covering, and electroplating.

Anti-corrosion coatings act as a barrier layer that prohibits or slows down the formation of corrosion on the underlying metal surface of the carbon steel pipe. By preventing external corrosion with the use of either single or multi-layer anti-corrosion coatings, it ensures precious natural resources and other products reach their destination safely and efficiently.

Steel surface treatment

Steel surface treatment is mainly for anti - rust, and the following is the anti - rust process

First step:Clean the steel surface using a cleaning solvent emulsion. This is to remove oil, grease, dust, lubricants, and similar organic matter. However, it cannot remove rust, oxides, or soldering agents on the steel surface.

Second step:Use rust - removing tools. You need to use a wire brush to remove loose or flaking oxides, rust, and slag. To achieve the desired rust - removing effect, the type of abrasive should be selected based on the original corrosion degree of the steel surface, the required surface roughness, and the coating. For an epoxy layer or two - or three - layer polyethylene coating, using a mixed abrasive of grit and steel shot for blasting is more likely to achieve the desired effect.

Third step:Perform pickling. Generally, chemical and electrolytic pickling are two methods. Using only chemical pickling can cause pipeline corrosion. Although chemical cleaning can achieve a certain level of surface cleanliness and roughness, it causes some environmental pollution.

Anti-Corrosion Pipes are steel pipes with protective coatings like zinc or epoxy to resist rust in harsh environments.

Superior corrosion resistance, high strength, long lifespan, and compliance with ASTM A53, A123, and ISO 1461 standards.

E.g., Grade B: C ≤0.30%, Mn ≤1.20%, P ≤0.05%, S ≤0.045%, Cu ≤0.40%, with zinc or epoxy coating.

E.g., Grade B: Tensile ≥415 MPa, Yield ≥240 MPa, Elongation ≥30%.

Diameters from DN15 (1/2”) to DN600 (24”), wall thickness SCH 40 to SCH 160.

Tensile, hydrostatic, and coating adhesion tests ensure quality and durability.

Oil and gas pipelines, water supply, chemical processing, marine structures, power plants, and cooling systems.

Anti-Corrosion Pipes are more cost-effective but may require maintenance compared to stainless steel in extreme conditions.

Yes, epoxy-coated variants are ideal for handling corrosive chemicals.

ASTM A53, A123, ISO 1461, and NACE standards ensure quality and performance.

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Standards and Specifications

• Anti-Corrosion Pipe specifications
• ASTM A53 corrosion-resistant pipes
• A123 galvanized steel pipes
• ISO 1461 coated steel pipes

Applications

• Anti-corrosion pipes for oil and gas
• Coated steel pipes for water supply
• Corrosion-resistant pipes for chemical plants
• Durable piping for marine structures

Material and Grades

• Anti-Corrosion Pipe material properties
• A53 Grade B coated steel pipes
• Zinc-coated steel piping grades
• Epoxy-coated steel pipe materials

Manufacturing and Testing

• Anti-Corrosion Pipe manufacturing process
• Coated steel pipe quality testing
• Zinc coating thickness standards
• Epoxy coating adhesion testing

Note: Anti-Corrosion Pipes meet international standards, ensuring high performance and durability. Contact suppliers for detailed specifications.

Anti-Corrosion Pipe Standard Specifications

Manufacturing Standards for Anti-Corrosion Pipe
Standard	Description
GB/T3091	Welded steel pipe for low pressure liquid delivery
GB/T9711	Petroleum and natural gas industries -- Steel pipe for pipelines
IS: 3589	Steel tubes for water and sewage
IS: 1978-1982	Steel tubes for use in transportation of oil, gas, and petroleum products
ASTM A53	Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
DIN 2458	Welded steel pipes and tubes
EN10217	Welded steel tubes for pressure purposes. Technical delivery conditions. Non-alloy steel tubes with specified room temperature properties
API 5L	Line Pipe
SY/T5037	Spiral submerged arc-welded steel pipe for pipelines for low pressure field fluid service
SY/T5040	Spiral submerged arc-welded steel pipe piles
CJ/T3022	Spiral submerged-arc welded steel pipe for municipal heat supply
ASTM A252	Welded and seamless steel pipe piles

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

Coating Standards for Anti-Corrosion Pipe
Standard	Description
ANSI/AWWA C104/A21.4	American National Standard for Cement-Mortar Lining for Ductile-Iron Pipe and Fittings for Water
ISO 21809	Petroleum and natural gas industries -- External coatings for buried or submerged pipelines used in pipeline transportation systems
DIN 30670	Polyethylene coatings of steel pipes and fittings

These standards ensure that Anti-Corrosion Pipe meet rigorous requirements for corrosion resistance, mechanical strength, and suitability for applications like oil and gas pipelines, water transmission, and chemical processing.

Anti-Corrosion Pipe Applications

Anti-Corrosion Pipe typically refers to a type of polyethylene-coated steel pipe used in water distribution, drainage, and gas supply systems.

Water Supply – Common in municipal water systems and irrigation.
Sewer Systems – Used for drainage and wastewater applications.
Gas Distribution – Suitable for transporting natural gas and propane.
Extended Service Life – The 2PE coating significantly increases lifespan.
Low Maintenance – Enhanced protection lowers operational costs.
Customizability – Available in varied diameters and thicknesses.
Oil and Gas Transportation – Widely used for crude oil, petroleum products, and LNG/LPG pipelines.
Marine Pipelines – Designed for offshore drilling, subsea transport, and marine applications.

Anti-Corrosion Pipe

Rubber Lined Pipe

3PE pipe

IPN8710 Pipe

Single layer epoxy powder

3PP Pipe

Pipe Cement Mortar Lining

HDPE Lined Pipe

FBE Coated Pipe

Internal Coating Pipes

PTFE Pipe Lining

2PE Pipe

Anti-corrosion Coating