seamless steel pipes(plain end) Size:1/2"-48" Material:A234-WPB,A420-WPL6,A234-WP12,A234-WP11,A234-WP5 seamless carbon steel pipe standard: GB/T, ASTM, API 5L, API 5CT, JIS, DIN Certificate: API Acquired the certificate of ISO9001, API 5L. Seamless carbon steel pipe Standard: GB/T, ASTM,API, JIS,DIN Wall-thickness: 2mm-65mm Size: DN10-920MM ISO9001 steel pipe(plain end)