What material spiral steel pipe can be used for natural gas pipeline?

　　Spiral steel pipe is used in large-caliber natural gas pipelines, but there are strict requirements for the material and standard of spiral steel pipe.
　　First: Material requirements
　　16Mn spiral steel pipe, Q345B spiral steel pipe, L245 spiral steel pipe, L360 spiral steel pipe, X40-X80 spiral steel pipe,API 5L Sch 80 Welded Spiral Steel Pipe and so on, these are often used in natural gas pipelines.
　　Second: Requirements for Standard Implementation
　　9711.1 Spiral Steel Pipe and 9711.2 Spiral Steel Pipe
　　Third: Anti-corrosion requirements for exterior wall
　　Exterior wall anticorrosion usually uses 3PE anticorrosion.

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