SY 6423.1-2013 Non-destructive testing methods for pressure-bearing steel pipes in the oil and gas industry Part I: Radiographic inspection of weld seam defects in welded steel pipes (English Version)
1970SY 6423.1-2013 Non-destructive testing methods for pressure-bearing steel pipes in the oil and gas industry Part I: Radiographic inspection of weld seam defects in welded steel pipes