... -50mm; 3. Length: 3-12m 4. Standard: ASTM, API 5L/5CT, JIS, DIN, BS, GB/T Detailed information is ... -12m4. Producing Standard:American ASME B36.10M, ASTM, API 5L, API 5CT Japanese JISGerman DINChinese GBBS standard5. Main Material:(Carbon Steel ... , generating tube etc10. Certificates:ISO9001-2000, ISO14000, ISO18000, API 5L certificate11. Picturesour producing flow chart, our factory, production line, ...