Our company puts the quality of products in the first place. All goods through advanced inspection, online and offline ultrasonic test, steel flat head groove machine, hydraulic test with a relative central of test parent metal chemical composition and mechanical properties, etc. Meantime, the company has a strictly specified quality assurance system. We have got the certificate of A P I 5L and A P I 5CT granted by american petroleum institute. our company has won a high reputation in the domestic and foreign markets with high-quality products.The products are exported to South America, Africa,Southeast Asia. Mid East, Eastern Europe counrties .