About Us
Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
News
In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
Services
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Facility
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Projects
Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
Specially coated pipes
refer to a type of pipe that is based on ductile iron pipes and applies special
coating materials to its inner or outer walls to improve its anti-corrosion,
wear-resistance, corrosion resistance and other properties.
Common Special Coatings: cement mortar + epoxy resin lining, epoxy ceramic lining, polyurethane inner coating.
The complex soil corrosion requires higher
external corrosion resistance of pipelines.
China has a vast territory, and the corrosion of soil in different regions is relatively different. Under the premise of intensive study of typical corrosive soils across the country, ductile iron pipes have the ability to tailor different external anti-corro
sion coatings for
customers, and ensure long-term safe operation of pipelines.
The basic external anti-corrosion coating
that Eastern Steel Manufacturing Co.,Ltd provides is the Zinc layer, which has
good anticorrosion performance in most soil environments. However, in special
circumstance, the protection of Zinc layer cannot resist the erosion of strong
corrosive soils, so it is necessary to protect the pipe by using polyethylene
sleeve as an anti-corrosion layer or special coating. According to the soil
environment of the buried pipeline, and the judgment of soil corrosive, Eastern
Steel Manufacturing Co.,Ltd can help customers to design pipeline
anti-corrosion scheme that meeting using requirements as well as high cost
performance.
Special coating pipe for ductile iron refers to
a layer of special anti-corrosion material coated on the surface of ductile
iron pipe to improve its corrosion resistance, wear resistance and service
life. Common special coatings include cement mortar + epoxy resin lining, epoxy
ceramic lining and polyurethane inner coating.
Common special coatings：
1. Cement mortar + epoxy resin lining
This coating uses two-component epoxy
coating, does not contain any organic solvents, will not release any pollutants
into the water body, can effectively inhibit the precipitation of alkaline
substances in the cement lining, and ensure that the water quality is safer and
more hygienic. Because the coating is smoother than the cement lining, it
reduces the head loss during pipeline operation and saves the operating cost of
the pipeline. The recommended sealing layer thickness is 100μm, which is suitable for drinking water, direct drinking water, soft
water for special industrial purposes, etc.
2. Epoxy ceramic lining
Epoxy ceramic is a new type of
anti-corrosion coating. The epoxy ceramic coating is cured on the cement inner
wall of the cast iron pipe by mechanical spraying or manual brushing. This
coating is dense and smooth, hard, seawater resistant, corrosion resistant, and
has excellent electrical insulation properties. It is suitable for conveying
sewage, reclaimed water, drinking water, etc. Its service life can reach more
than 100 years, with a smooth surface, low friction resistance, and excellent
hydraulic performance.
3. Polyurethane inner coating
The polyurethane inner coating is sprayed
with a two-component, solvent-free, 100% solid polyurethane material, which has
excellent anti-corrosion and wear resistance. It is suitable for water supply
projects with all water qualities from soft water to hard water, such as
municipal sewage and certain industrial wastewater. This coating has a smooth
surface and low friction resistance, and is suitable for conveying wastewater
with high solid particle content, industrial water, and surface water.
Ductile iron pipes can be divided into
the following categories according to the different outer surface coatings:
1. Asphalt coated ductile iron pipes
Asphalt coating is the most common type of coating, mainly used to prevent pipelines from being corroded when used in buried or water. Asphalt coating has good corrosion resistance and water resistance, and
is suitable for water supply pipelines and drainage pipelines.
2. Ductile iron pipe with cement mortar
coating
Ductile iron pipe with cement mortar
coating is a pipe with a layer of cement mortar on the outer surface, which has
a strong anti-corrosion effect and is particularly suitable for occasions that
require higher wear resistance and corrosion resistance, such as environments
that are in contact with soil or water for a long time.
3. Epoxy coated ductile iron pipe:
Epoxy coating provides excellent
anti-corrosion performance, especially for underground or submarine pipelines.
It has the characteristics of strong chemical resistance, good corrosion
resistance, and anti-aging, and is widely used in water supply, drainage, and
gas transmission systems.
4. Polyurethane coated ductile iron pipe
Polyurethane coated ductile iron pipe
provides high corrosion resistance, impact resistance, and wear resistance, and
is suitable for pipelines in harsh environments, especially for occasions that
need to withstand large mechanical impacts.
5. Epoxy coal tar coated ductile iron pipe
This coating combines the advantages of
epoxy resin and coal tar, can provide stronger corrosion resistance and weather
resistance, and is often used for underground pipelines or long-distance water
pipelines in humid environments.
These special coated pipes
have the following advantages:
1. Excellent anti-corrosion performance
Can effectively resist
various corrosive substances and extend the service life of the pipe.
2. Strong wear resistance
Suitable for high flow
rate environment, reducing wear.
3. Sanitary and reliable
The lining is smooth,
suitable for drinking water transportation, ensuring water quality safety.
4. Good environmental performance
Most coating materials are solvent-free and have no volatile organic compound emissions, meeting environmental protection requirements.
E-mail: sales@eastern-steels.com
