The main differences between pipeline pipes and ordinary steel pipes lie in their materials, application scenarios, and classification standards.
Firstly, in terms of materials, pipeline pipes typically use high-strength, high-toughness, high-quality low-alloy structural steel, such as X70 and X80 steel grades. This makes their corrosion resistance significantly superior to that of ordinary steel pipes, which are mostly made of ordinary carbon steel.
Secondly, in terms of applications, pipeline pipes, due to their superior performance, are widely used in key areas such as urban gas supply, oil and natural gas transportation, and water conservancy projects; while ordinary steel pipes are more commonly used in building structures, the manufacture and support of mechanical components, etc.

Time：09/06/2026 17:41:31

Performance and Manufacturing Process Comparison
Pipeline Steel Pipes:
Typical Material: X42-X80 grade steel (e.g., X60 indicates a yield strength ≥414 MPa), requiring a drop hammer tear test (DWTT) to ensure low-temperature brittleness resistance.
Working Pressure: Typically ≥10 MPa (e.g., the West-East Gas Pipeline design pressure is 12 MPa), requiring a hydrostatic test (test pressure is 1.5 times the design pressure).
Standard anti-corrosion coating (e.g., 3LPE anti-corrosion layer thickness ≥2.5 mm); some require the addition of corrosion inhibitors.

Ordinary Steel Pipes: Pressure-bearing capacity is mostly <6 MPa, no mandatory anti-corrosion requirements, and only some galvanized pipes (zinc layer thickness ≥40 μm) are used for rust prevention.

Differences in Manufacturing Processes
Pipeline Steel Pipes: Material is mostly Q195-Q345B, with a lower limit of yield strength of only 195 MPa, and no mandatory low-temperature toughness requirements. For high-frequency resistance welding (HFW) or submerged arc welding (SAW), the weld seams require 100% ultrasonic testing.

For ordinary steel pipes, ordinary arc welding or cold rolling is used, and the weld seam inspection rate is low (e.g., 5% random sampling).

Time：09/06/2026 15:35:17

Answers

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