A106 Grade B 3PE Plastic-Coated Steel Pipe combines superior strength with robust corrosion resistance. Crafted from A106 Grade B steel, it offers excellent pressure-bearing capacity, ideal for high-pressure fluid transport. The 3-layer PE coating (epoxy primer, adhesive, PE layer) forms a tight barrier against rust, chemicals, and moisture, extending service life in harsh environments.
Seamless construction minimizes leakage risks, ensuring reliable performance in oil/gas pipelines, water projects, and industrial systems. It balances durability with easy installation, fitting diverse engineering needs. Cost-effective and compliant with strict standards, this pipe delivers long-term stability across demanding applications.
1. Excellent High-Temperature and High-Pressure Tolerance
Compliant with ASTM A106 standards, Grade B steel has a designed temperature range of -29°C to 454°C, enabling long-term transportation of high-temperature fluids (e.g., steam, high-temperature oil, hot water). It performs stably in thermal power plant steam pipelines and oil refinery furnace outlet pipelines.
Outstanding mechanical properties: Tensile strength ≥415MPa, yield strength ≥240MPa. With uniform wall thickness (no weld defects due to seamless forming), it can withstand high working pressures (rated pressure up to 10–35MPa depending on wall thickness), preventing pipe rupture or deformation under high pressure.
2. Good Workability and Weldability
The steel has low carbon content (≤0.30%), ensuring excellent weldability. It can be connected via arc welding, TIG welding, etc., and maintains structural stability without complex post-welding heat treatment—adapting to on-site construction needs.
3. High Cleanliness and Fluid Compatibility
The inner wall of A106 Grade B steel pipe is smooth (surface roughness Ra ≤12.5μm), with no weld protrusions or impurities, reducing fluid transmission resistance and avoiding medium retention. Meanwhile, the steel itself has good chemical stability and does not react with water, steam, neutral oils, or other media, making it suitable for food-grade fluids or precision industrial fluid transmission.
II. Long-Term Corrosion Protection and Environmental Adaptability of the 3PE Coating (Core Value-Added Advantage)
The 3PE coating (epoxy primer + adhesive + polyethylene outer layer) provides an "all-round protective barrier" for A106 Grade B steel pipes, solving the pain points of traditional steel pipes—such as easy corrosion and short service life:
1. Three-Layer Synergistic Corrosion Protection, Service Life Exceeding 30 Years
Inner Layer: Fusion-Bonded Epoxy (FBE, Thickness 80–120μm)： It bonds tightly to the steel pipe surface via high-temperature melting, with adhesion strength ≥100N/cm. It forms a chemically inert barrier, isolating the steel pipe from contact with soil, groundwater, and industrial corrosive media (e.g., sulfides, acid-alkaline solutions), fundamentally blocking electrochemical corrosion.
Middle Layer: Copolymer Adhesive (Thickness 170–250μm)： Acting as a "transition layer," it is compatible with both the epoxy primer and the outer polyethylene layer, eliminating delamination risks caused by differences in thermal expansion coefficients between the two materials and ensuring the overall integrity of the coating.
Outer Layer: High-Density Polyethylene (HDPE, Thickness 1.8–3.7mm)： Provides physical protection, with impact resistance (withstanding a 1.5kg hammer dropped from 1.5m without damage), scratch resistance, and UV aging resistance. It can resist mechanical damage during pipe transportation/burial construction and withstand sun, rain, and snow in open-air environments.
2. Adaptation to Harsh Environments in Multiple Scenarios
Wide Temperature Range：The coating works stably at -40°C to 80°C (special modified formulations can withstand 110°C). It is suitable for buried pipes in cold northern regions (preventing low-temperature brittleness) and can match the medium-high temperature fluid transmission needs of A106 Grade B base material (e.g., fluid transmission below 80°C).
Resistance to Complex Corrosive Media：It resists corrosion from acidic/alkaline soil (pH 3–11), saltwater (offshore or coastal pipelines), and industrial sewage (containing sulfides, chlorides). Even in long-term buried or wet environments, it avoids rust and perforation of the steel pipe, reducing maintenance frequency.
