HomeTechnical ArticlesStudy on Steel-Plastic Interface Bond Strength of Steel Wire Skeleton Plastic Composite Pipes ——High-Pressure Water Transmission Applications Based on GB/T 32439 Standard
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Study on Steel-Plastic Interface Bond Strength of Steel Wire Skeleton Plastic Composite Pipes ——High-Pressure Water Transmission Applications Based on GB/T 32439 Standard
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Post by by 孙飞虎
1. Research Background
Steel Wire Skeleton Plastic Composite Pipes (SRTP), with a"high-strength steel skeleton + HDPE"structure (Figure 1), are increasingly used inurban water and gas networks. While theirring stiffness reaches SN12.5,interface bond failuresaccount for53%of leaks (2024 CPPIA data), especially underhigh pressure(>1.6MPa).
2. Core Issue: Interface Failure Mechanism
2.1 Bond Failure Modes
Throughuniversal testing machines(GB/T 18369-2008) andSEM, three failure modes were identified: 
Interface debonding(68%): Bond strength <3.5MPa
Plastic tearing(22%): Insufficient HDPE strength
Steel corrosion(10%): Electrochemical corrosion at interface gaps
Conclusion This paper establishes a high-pressure reliability system throughinterface modification + structural design + process control. As a professional supplier, we provide: ✅ Custom high-pressure SRTP pipes (PN1.0-PN2.5) ✅ Steel-plastic bond strength testing ✅ Electrofusion welding process certification
Keywords: Steel wire skeleton plastic composite pipe, steel-plastic interface, bond strength, high-pressure water transmission, GB/T 32439
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