Coated Composite Steel Pipe for Underground Coal Mines
PRODUCT STRUCTURE
- Working steel pipe: Seamless steel pipe, straight seam steel pipe and spiral steel pipe are used as base pipes, which play the main pressure-bearing role.
- Inner anti-corrosion layer: Generally, sintered epoxy powder is used as the inner anti-corrosion layer. Because the epoxy resin coating has extremely strong adhesion, it is not easy to fall off, the surface is smooth, and it is not easy to scale, which improves the transportation efficiency.
- External anti-corrosion layer: sintered epoxy powder, polyethylene powder or other material anti-corrosion layer.

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 Performance Characteristics


No.

Item

Requirements

1

Pinhole test

The electric spark detector detects that there is no electric spark.

2

Adhesion

      Polyethylene coating ≥30N/cm

Epoxy resin coating ≥ level 3

3

Bending properties

No cracking or peeling of the coating

4

Flattening performance

No cracking or peeling of the coating

5

Impact properties

No cracking or peeling of the coating

6

Surface resistance,Ω

≤1x106 Ω



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