Anti-corrosion Steel Pipe

Anti-corrosion Steel Pipe apply anti-corrosion processing technology to prevent or mitigate the steel pipe corrosion phenomena during the transport and use of the pipes. Anti-corrosion steel pipe mainly used in pipeline projects in petroleum, chemical, natural gas, heating, sewage treatment, water, bridges area. These type of pipes is widely applied to anti-corrosive steel marine facilities, petrochemical, industrial and mining enterprises in the construction industry, various types of tanks, transport pipeline.

Anti-corrosion Coating
There are many categories of corrosion media for bare steel pipe, such as acid, alkali, salt, oxidants and water vapor. The coating of steel pipe must be chemically inert, acid salt corrosion, structure compact, waterproof permeability, adhesion, tough fullness.

FBE Anti-corrosive Coating
Apply electrostatic spraying technology to coat epoxy powder at the surface of steel pipe. This technology will be applied once and finish a complete coating at the surface of the steel pipe. The coating operation process is simple, environment friendly, good coating impact resistance and flexural properties, temperature resistance advantages. FBE anti-corrosion coating is a new type of coating developed in the last 30 years.

Specification: Outside Diameters: 89mm~1820mm, Wall Thickness: 6mm~20mm
Material: Q235B, Q345B, 10#STEEL, 20#STEEL, X42~X80 etc.
Application: Widely used in oil pipelines, gas pipelines, heating pipes, water pipes.
Executive Standard: API 5L, GB / T9711-2011, DIN30670, DIN30671, SY / T0413-2002, SY / T0315-97, GB / T23257-2009, SY / T0447-96, SY / T0457-2008, CECS10: 89, CJ / T114-2000, CJ / T115-2001, CJ / T200-2004, GB / T29047-2012, SY / T4054-2003, CJ / T120-2008, etc.

2PE/3PE Anti-corrosion Coating
2/3PE anti-corrosion coating steel pipe is the type of steel pipe coated with three layered structure of polyolefin coating (MAPEC). 2/3 PE anti-corrosion coated steel pipe is commonly used as a preservative pipeline. Applying electrostatic spraying epoxy power at the surface of the steel pipe first, then apply lateral wound adhesive and lateral wound polyethylene coating at the steel pipe. Combined with three excellent performance to improves the overall quality of pipeline corrosion. The advantage of the coating is resistant to chemical corrosion, cathodic stripping, resistance to mechanical damage performance.

3PE anti-corrosive coating is generally consists of three layers.
1) the first layer of mixed epoxy powder (FBE >100um).
2) the second layer of adhesive (AD: 170um ~ 250um).
3) the third layer of polyethylene (PE: 2.5mm ~ 3.7mm).
In actual operation, these three kinds of materials will combined after the processing and formed a solid excellent anti-corrosion layer. The processing methods are generally divided in two and wound sheathed round mold.

Domestic implementation standard for 3PE anti-corrosion coated steel pipe is SY/T0413-2002 which is effect implementation from August 1, 2002. This standard mainly specify polyethylene and high-density polyethylene-based. The thickness of the outer coating is specified under the German Standards DIN 30670-1991. This standard is greatly improved the impact strength of 3PE anti-corrosion coating. Under this standard, the peel strength and impact indicators will significantly improved and clearly defined for 3PE anti-corrosion coated steel pipe. Also, this standard has defined the carbon black content for some special materials which is increased the mending peel strength ( ie. thermal units, the peel strength of the primer steel thermal band) frequency sampling tests.

Anti-corrosion Coating for Steel Pipes

Nowadays, anti-corrosion coated steel pipe is widely used in urban underground pipe network for transporting gas, oil, water, etc. Since the pipeline need to be buried in the soil for a quite long time, so it requires water resistance, chemical resistance and other long-term corrosion resistance. Besides, anti-corrosion coated steel pipe should meet a variety of performance to make sure the pipeline could be transport, storage and embedded in the process. For example, the pipeline should meet a specific properties such as impact resistance, abrasion resistance, hardness, corrosion resistance, ductility, elongation strength. The importance of these properties varies by the use of different environments, construction methods and material differences.

Polyethylene tape coating:
Polyethylene tape is one of the main anti-corrosion material widely used on pipeline. The using temperature ranges from -30 degrees to 70 degrees and it has good impact resistance, static pressure, water tightness and other properties. The coating process is simple, convenient, affordable, so it is widely accepted by the users. When using polyethylene tape as anti-corrosion coating, the different thickness and different width of the tape is depending on the anti-corrosion requirements and different construction methods.

Epoxy powder coating:
Epoxy powder coating is appeared in the 1960s, it is applied by electrostatic spraying method. The powder is spread onto the pre-heated tube surface, and then a dense layer coating formed after the tube cool down. The advantages for this type of coating is have good corrosion resistance, less environmental pollution, wide using temperature range ( ranges from 60 degrees to 100 degrees), large tube adhesion, impact resistance, less welding damage, water resistance, electrical insulation etc. While the disadvantages are vulnerable to inquiry, high technical requirements, complex equipment needed. Therefore, it is very difficult to manage the construction filed. Different manufacturers, or even different batches of product performance differences. We advise the purchasers, when they make the decision, their choice should focus on its mechanical properties and adhesion resistance.

The using time for buried pipeline is critical. So far, PE anti-corrosion coating is considered to be the most advanced coating in the world due to its chemical stability, mechanical resistance, scratch resistance etc. 

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