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Spiral welded steel pipes Specifications STD API-5L GB/T9711.1-1997 GB/T9711.2-1997 SY/T5037-2000 SY/T5040-92 MAT L245~L555 Q235 Q345 20# Grade X42~X80 W.T 5~26mm O.D 219~2222mm Product show We ...