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Model:DN15-DN300

Precoated steel pipe Specially coated steel pipe for gas Inner and outer coated steel pipe for water supply Drain with inner and outer coated steel pipe Inner and outer coated steel pipe for fire protection Externally coated galvanized steel pipe for fire protection

The pre-coated steel pipe is a new type of green pipe developed by Jinzhou Pipe Joint Research Center. It is based on the high-quality hot-dip galvanized steel pipe (or black pipe) produced by our company, and coated with one or more layers of epoxy polyester paint on the surface of the steel pipe by advanced electrostatic spraying process. The product has good mechanical properties and strong corrosion resistance. The annual production capacity of more than 20,000 tons, product quality in line with GB/T 42541 "gas pipeline coated steel pipe" standard requirements, the performance indicators reach the domestic advanced level, can be widely used in urban gas pipeline transportation.

Technical parameters

Specification:
DN15-DN150
Wall thickness:
2.6 mm to 6.0 mm
Length:
2.0 m to 6.1 m
Criteria:
GB/T 42541
Material:
Q235B, 20#, epoxy polyester paint
Product Performance

  • Excellent corrosion resistance

    Spray a layer of two-component epoxy polyester paint or a layer of two-component epoxy polyester paint plus a layer of acrylic acid on the substrate. After curing, the coating has good adhesion and uniform coating thickness. The outer wall of the product has double protection effect of coating layer and galvanized layer, excellent anti-corrosion performance, suitable for urban gas pipeline.

  • Excellent mechanical properties

    With galvanized steel pipe (or black pipe) as the matrix, it has excellent mechanical properties and strong resistance to impact, bending and pressure.

Gas special coated steel pipe is based on the company's own high quality welded steel pipe, seamless steel pipe as the substrate, on the substrate steel pipe or on the overall hot dip galvanized steel pipe on the basis of external surface treatment to produce gas coated steel pipe (also can provide internal and external coated steel pipe according to customer needs, coating thickness, quality according to the agreement of both parties). The welded pipe or galvanized steel pipe conforms to the GB/T3091 standard, the seamless steel pipe conforms to the GB/T8163 standard, and the quality of the outer coating is in accordance with the GB/T 42541 standard, which is widely used in gas transportation.

Technical parameters

Specification:
DN15-DN300
Wall thickness:
2.8 mm to 7.0 mm
Length:
5.8 m to 9.0 m
Criteria:
GB/T 42541
Material:
Q235B, 20#, epoxy powder
Product Performance

  • Excellent mechanical strength

    This product has the same excellent mechanical strength as the ordinary galvanized steel pipe, and has a strong ability to withstand impact, bending and pressure.

  • Excellent weather resistance

    The outermost coating is polyester epoxy resin coating, which has excellent weather resistance.

The inner and outer coated steel pipes for water supply are made of high quality straight seam high-frequency welded steel pipes, spiral seam submerged arc welded steel pipes or seamless steel pipes as the matrix. The products are made of epoxy powder and polymer materials coated on the inner and outer walls of the steel pipes by sandblasting, oil removal and rust removal, spray and suction coating process, and the product quality is in line with GB/T 28897, CJ/T 120 standards. Suitable for drinking water and industrial water supply.

Technical parameters

Specification:
DN15-DN300
Wall thickness:
2.6 mm to 9.0 mm
length :
2.8 m to 9.0 m 
Standard :
GB/T 28897, CJ/T 120 Objective
Material:
Q195, Q215A, Q215B, Q235A, Q235B, Q355, 20#; Epoxy powder, polyester powder, etc
Product Performance

  • Strong corrosion resistance

    The conveying fluid is completely and effectively isolated from the metal body, only in contact with the coating layer, which has good corrosion resistance and long service life of the pipeline.

  • High mechanical strength

    The inner and outer coated steel pipe and high-frequency welded pipe, spiral welded pipe, hot dip galvanized steel pipe, seamless steel pipe have the same excellent mechanical strength, the impact, bending and pressure has a strong bearing force, the use of pressure range is ≤1.6MPa, seamless steel pipe >1.6MPa.

  • Excellent hygiene performance

    The coated pipe used for drinking water is coated with food-grade epoxy powder. The coating is non-toxic and tasteless, and the health indicators are in line with the national standards for drinking water transmission and distribution.

  • Small fluid resistance

    The coating layer of the inner wall of the product is smooth, the friction coefficient is small, the flow rate is fast, the scale is not accumulated, and the fluid resistance is small.

The inner and outer coated steel pipe for drainage is made of high quality straight seam high-frequency welded steel pipe, spiral seam submerged arc welded steel pipe or seamless steel pipe as the matrix. It is made of epoxy powder/polyester polymer material on the inner and outer wall of the steel pipe after sand blasting, oil removal and rust removal, and advanced absorption and spraying technology. The product is in line with GB/T 28897, CJ/T 120 standards. Suitable for rainwater, sewage and other drainage fields.

Technical parameters

Specification:
DN15-DN300
Wall thickness:
2.6 mm to 9.0 mm
Criteria:
GB/T 28897
Length:
2.8 m to 9.0 m
Material:
Q195, Q215A, Q215B, Q235A, Q235B, Q355, 20#; Plastic: PE, PE-X
Product Performance

  • Strong corrosion resistance

    The conveying fluid is completely and effectively isolated from the metal body, only in contact with the coating layer, which has good corrosion resistance and long service life of the pipeline.

  • High mechanical strength

    The inner and outer coated steel pipe and high-frequency welded pipe, spiral welded pipe, hot dip galvanized steel pipe, seamless steel pipe have the same excellent mechanical strength, the impact, bending and pressure has a strong bearing force, the use of pressure range is ≤1.6MPa, seamless steel pipe >1.6MPa.

  • Small fluid resistance

    The coating layer of the inner wall of the product is smooth, the friction coefficient is small, the flow rate is fast, the scale is not accumulated, and the fluid resistance is small.
Main physical and chemical properties
Serial number Project Technical parameters
1 Coating adhesion The adhesion is of grade 1-3
2 Bending resistance (nominal diameter ≤50mm) No cracks, no delamination of steel
3 Flattening resistance (nominal diameter > 50mm) No cracks, no delamination of steel
4 Impact resistance test The coating does not peel and break
5 Pinhole test The voltage is the minimum coating thickness specified by the standard (μm) ×5V/μm, and there is no EDM generation

The inner and outer coated steel tubes for fire protection are made of high quality straight seam high-frequency welded steel tubes, spiral seam submerged arc welded steel tubes or seamless steel tubes as the matrix. The products are made by sandblasting, oil removal and rust removal, spray and suction coating, and coated with epoxy powder polymer materials on the inner and outer walls of the steel tubes. The product quality is in line with GB/T5135.20 standard, which is suitable for fire water supply and foam medium transportation.

Technical parameters

Specification:
DN15-DN300
Wall thickness:
2.6 mm to 9.0 mm
length :
2.8 m to 9.0 m 
Standard :
GB/T 5135.20 Objective
Material:
Q195, Q215A, Q215B, Q235A, Q235B, Q355, 20#; Epoxy powder, polyester powder, etc
Product Performance

  • Excellent corrosion resistance

    The conveying fluid is completely and effectively isolated from the metal steel pipe, only in contact with the coating layer, with good corrosion resistance effect, and according to different fluid media and acid, alkali, salt environment, coated with the corresponding anti-corrosion powder coating, long service life of the pipeline.

  • Excellent mechanical strength

    The inner and outer coated steel pipe for fire protection has the same excellent mechanical strength as high-frequency welded pipe, spiral welded pipe and seamless steel pipe, and has a strong ability to withstand impact, bending and pressure. The pressure range of welded pipe is ≤1.6MPa. (For higher bearing pressure, seamless steel pipe processing is available)

  • The smooth resistance of the pipe wall is small

    This product has smooth coating layer on the inner wall, small friction coefficient, small fluid resistance, fast flow speed, no scale accumulation, more suitable for fire water supply.

  • Good high temperature resistance

    The inner AND outer walls of this product are coated with high temperature resistant epoxy powder coating, which is suitable for high-rise and underground building fire pipes to ensure smooth water supply in case of fire.

Fire-fighting COATED galvanized steel pipe is made OF SELF-MADE high quality hot-dip galvanized steel pipe as the matrix and coated with powder coating on the outer wall of the steel pipe by spraying process, which is suitable for fire-fighting water supply.

Technical parameters

Specification:
DN15-DN300
Wall thickness:
2.6 mm to 9.0 mm
length :
2.8 m to 9.0 m
Coating thickness:
≥80um
Standard :
GB/T 3091, Q/JGK 0024-2024 Objective
Material:
Q195, Q215A, Q215B, Q235A, Q235B, Q355, 20#; Epoxy powder, polyester powder, etc
Product Performance

  • Excellent mechanical strength

    This product has the same excellent mechanical strength as the ordinary galvanized steel pipe, and has a strong ability to withstand impact, bending and pressure. The pressure range is ≤1.6MPa. (For higher bearing pressure, seamless steel pipe processing is available)

  • Good high temperature resistance

    The outer wall of the product is coated with high temperature resistant epoxy powder coating, especially suitable for industrial and civil building fire pipe.

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