... Thickness:3-60mm; 3. Length: 3-12m 4. Standard: ASTM, API , JIS, DIN, BS, GB . Normal Out Diameter:6-950mm ... 3mm-60mm3. Normal Length:3m-12m4. Producing Standard:American ASTM, API 5L, API 5CT, Japanese JIS, German DIN, Chinese GB/T, BS ... tube, generating tube etc10. Certificates:ISO9001-2000, ISO14000, ISO18000, API 5L certificate11. Picturesour producing flow chart, our factory, production line, ...