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Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry
Flame Retardant Plastic Coated Q235 Steel Pipe is designed for underground mining pipeline systems where corrosion resistance, coating adhesion, flame-retardant performance, antistatic properties, and mechanical reliability are required. The pipe combines a Q235 carbon steel load-bearing base pipe with a polyethylene or epoxy-based protective coating. Typical mining service includes underground water supply and drainage, where the steel substrate provides pressure-bearing strength while the plastic coating isolates the steel surface from moisture and corrosive mine environments.
For Chinese mining projects, the steel base pipe can be manufactured according to GB/T 3091, while coating quality may be evaluated with reference to CJ/T 120-2016. Mining-specific flame-retardant and antistatic requirements should be confirmed against the applicable mine-safety specification and project approval requirements. CJ/T 120-2016 specifies requirements including coating adhesion, pinhole inspection, bending or flattening performance, and impact resistance.
Specifications
Item
Specification
Product
Flame Retardant Plastic Coated Steel Pipe
Base Material
Carbon structural steel
Main Grade
Q235A / Q235B
Alternative Grades
Q195, Q215A, Q215B, Q275A, Q275B subject to design requirements
Base Pipe Standard
GB/T 3091
Coating Reference
CJ/T 120-2016
Mining Safety Reference
MT/T 181-1988 or applicable project-specific mining safety requirements
Manufacturing Method
ERW longitudinal welded steel pipe; other base-pipe constructions available by agreement
Nominal Size
Typically DN15-DN2000, subject to base pipe and coating process
Outside Diameter
According to specified base-pipe standard and project drawing
Wall Thickness
According to pressure class, diameter and base-pipe standard
Length
1-12 m, customizable
Length Tolerance
According to specified base-pipe standard or purchase agreement
Straightness
For DN >150 coated pipe, curvature can be controlled to ≤0.2% of total pipe length under CJ/T 120-2016 reference requirements
Coating Material
PE or epoxy-based coating; flame-retardant/antistatic formulation available for mining service
Coating Position
Internal coating, external coating, or internal and external coating
Surface Preparation
Shot blasting or equivalent surface preparation before coating
Surface Preparation Level
Sa 2½ commonly specified for larger coated base pipes
Surface Profile
Approximately 40-100 μm under CJ/T 120-2016 reference preparation requirements
PE Coating Adhesion
≥30 N/cm when evaluated according to CJ/T 120-2016
Heat Treatment
Normally supplied as welded condition; weld seam or full-body heat treatment can be specified when required
End Connection
Flanged, grooved, plain end or other engineered connection
Color
Customizable according to project identification requirements
Main Features
Flame-Retardant and Antistatic Coating
For underground mine environments, ordinary industrial PE coating should not automatically be treated as mining-grade coating. The polymer formulation can incorporate flame-retardant and conductive or antistatic components, with final safety performance verified according to the applicable mining specification.
MT/T 181-1988 is a long-established Chinese reference for safety-performance testing of plastic materials used underground in coal mines, particularly flame-retardant and electrical-conductivity-related properties. Mining coated composite pipes are commonly evaluated through a combination of coating, base-pipe and mining-safety requirements rather than relying on a general water-pipe standard alone.
High Coating Adhesion
Coating adhesion is critical because separation between the polymer layer and steel substrate allows moisture to penetrate beneath the coating.
For polyethylene coating evaluated according to CJ/T 120-2016:
PE coating adhesion: ≥30 N/cm
Proper surface preparation is required before coating. For larger base pipes, the referenced standard requires rust removal to approximately Sa 2½ and an anchor profile of approximately 40-100 μm before coating.
Coating Integrity Under Mechanical Deformation
A mining pipe may experience handling impact, installation loads and local deformation. CJ/T 120-2016 therefore includes mechanical integrity tests for the coating.
For nominal sizes up to DN50, coated pipes are subjected to bending evaluation. For sizes above DN50, flattening evaluation is used. After the specified test, the coating should show no cracking or peeling. An impact test is also required without coating cracking or delamination.
Pinhole-Controlled Corrosion Protection
The coating is intended to isolate the Q235 steel substrate from mine water and other corrosive media. The coated surface can be checked using an electric-spark detector to identify discontinuities or pinholes before shipment. CJ/T 120-2016 specifically includes this inspection method for coating integrity.
Our Advantages
Controlled Surface Preparation Before Coating
A frequent technical concern with plastic-coated steel pipe is premature delamination caused by insufficient removal of rust, oil, mill scale or oxidation products.
The base pipe is therefore prepared before coating by shot blasting or an equivalent process. For relevant large-diameter coated pipe, surface cleanliness can be controlled to Sa 2½ with an anchor profile around 40-100 μm before coating. This provides a mechanically suitable surface for coating bonding rather than applying polymer directly over untreated steel.
Coating Adhesion and Pinhole Inspection Can Be Defined in the Purchase Specification
Professional purchasers normally need measurable coating acceptance criteria rather than descriptions such as "strong adhesion."
For PE-coated pipe, an adhesion requirement of ≥30 N/cm can be specified with reference to CJ/T 120-2016. Electric-spark pinhole inspection, coating thickness measurement, bending or flattening testing and impact testing can also be included in the inspection plan.
Base Pipe and Mining Safety Requirements Are Controlled Separately
A coated mining pipe has two different engineering functions: the steel tube carries pressure and mechanical load, while the coating provides corrosion protection and contributes to mine-safety performance.
For this reason, the purchase specification can separately define GB/T 3091 requirements for the steel base pipe, CJ/T 120-2016 requirements for coating performance, and the applicable mining flame-retardant and antistatic testing requirements. This avoids incorrectly using a single coating standard as evidence of complete underground mining suitability.
Execution Standards
Standard System
Reference Standard
Scope
GB
GB/T 3091-2025
Welded steel pipes for low-pressure fluid delivery; suitable reference for the Q235 steel base pipe
CJ
CJ/T 120-2016
Plastic-coated composite steel pipe requirements including coating preparation, adhesion and integrity testing
MT
MT/T 181-1988
Reference for flame-retardant and safety performance of plastic materials used underground in coal mines
ASTM
ASTM A53/A53M
Common reference for welded or seamless carbon steel pipe for mechanical and pressure applications
EN
EN 10255
Non-alloy steel tubes suitable for welding and threading
JIS
JIS G3452
Carbon steel pipes for ordinary piping
GOST
GOST 3262
Steel water and gas pipes
Application
Underground Mine Drainage Pipeline
A typical application is an underground mine drainage pipe carrying accumulated groundwater from working areas toward the mine drainage system.
The Q235 steel substrate provides mechanical strength and internal-pressure capacity, while the plastic coating reduces direct contact between the steel surface and corrosive mine water. Where the pipe is installed in a coal-mine environment, flame-retardant and antistatic performance of the coating should be qualified according to the applicable mining safety requirements before underground use.
Chemical Composition
Grade
C Max. %
Si Max. %
Mn Max. %
P Max. %
S Max. %
Q195
0.12
0.30
0.50
0.035
0.040
Q215A
0.15
0.35
1.20
0.045
0.050
Q215B
0.15
0.35
1.20
0.045
0.045
Q235A
0.22
0.35
1.40
0.045
0.050
Q235B
0.20
0.35
1.40
0.045
0.045
Mechanical Properties
Grade
Minimum Yield Strength, t ≤16 mm
Minimum Yield Strength, t >16 mm
Minimum Tensile Strength
Minimum Elongation
Q195
195 MPa*
185 MPa*
315 MPa
According to applicable specimen requirement
Q215A
215 MPa
205 MPa
335 MPa
20%
Q215B
215 MPa
205 MPa
335 MPa
20%
Q235A
235 MPa
225 MPa
370 MPa
20%
Q235B
235 MPa
225 MPa
370 MPa
20%
Product Images
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A: Yes, we could offer the sample for free charge but need pay the cost of freight.
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A: Payment ≤ 2000 USD, 100% in advance. Payment ≥ 2000 USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.
