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Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Specifications
Heat Treatment :
Normally supplied as welded condition; weld seam or full-body heat treatment can be specified when required
Brand Name :
Torich
Model Number :
Q235
Certification :
CE,ISO
Place of Origin :
China
MOQ :
10 tons
Price :
$1450-1550
Payment Terms :
L/C,D/A,D/P,T/T,Western Union,MoneyGram
Supply Ability :
50 tons
Delivery Time :
25-30work days
Packaging Details :
Seaworthy Packing
Base Material :
Carbon structural steel
Alternative Grades :
Q195, Q215A, Q215B, Q275A, Q275B subject to design requirements
Outside Diameter :
According to specified base-pipe standard and project drawing
Length :
1-12 m, customizable
Wall Thickness :
According to pressure class, diameter and base-pipe standard
Product :
Flame Retardant Plastic Coated Steel Pipe
Base Pipe Standard :
GB/T 3091
Description
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
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
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Frequently Asked Questions
Q: Are you trading company or manufacturer?
A: Manufacturer, also can do trading.
Q: How long is your delivery time?
A: Generally speaking, it is 10-15 days if the goods are in stock, or it is 30-40 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples? Is it free or extra?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment?
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.
Product tags

carbon steel pipe material

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aluminized steel pipe

,

carbon steel grade pipe
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Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties

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Product Detail
Heat Treatment :
Normally supplied as welded condition; weld seam or full-body heat treatment can be specified when required
Brand Name :
Torich
Model Number :
Q235
Certification :
CE,ISO
Place of Origin :
China
MOQ :
10 tons
Contact Supplier
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties
Flame Retardant Plastic Coated Q235 Steel Pipe for Mining Industry with Corrosion Resistant and Antistatic Properties

TORICH INTERNATIONAL LIMITED

Verified Supplier
12 Years
zhejiang, ningbo
Since 1997
Business Type :
Manufacturer, Distributor/Wholesaler, Importer, Exporter, Trading Company, Seller
Main Products :
Precision Steel Tube, Seamless Steel Tube, Stainless Steel Tube
Total Annual :
25000000-30000000
Employee Number :
100~200
Certification Level :
Verified Supplier
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