... /ASME B16.5, DIN, JIS, GB, ASTM, JB, API 7. Tee Surface Treatment: Polishing, Pickling, Antiseptic, Abrasive blasting ... -rust oil, 3PE coating, Epoxy coating. 8. Tee Applications: Petroleum, chemicals, water conservancy, electric power, boiler, machinery, gas, ... heating, metallurgy and shipbuilding. Service We Provide: 1. Certificate: API 6H Certificate, ISO9001: 2000, ISO14001-2004, OHSAS18001: 1999, ...