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No.20 seamless steel pipe is different from l290 steel pipe. Can they replace each other?
You can't simply answer "yes" or "no". It depends on the specific application, specifications and requirements for mechanical properties.

1290 steel pipe is welded pipe, and its structural strength (especially fatigue strength) and compactness are not as good as those of 20 seamless steel pipe. However, welded pipes can form large-diameter thick-walled steel pipes, while seamless steel pipes cannot be produced indefinitely due to the limitation of equipment performance.