The steel pipes used in the kelly are all made of materials made by first-class steel companies at home and abroad. Yield strength and service life are more than double that of general-purpose products, meeting the stringent requirements of drilling hard rock and various formations.

​The whole set of kelly bar with light weight, high strength, high linearity of the single section, thin pipe wall, small seam
between sections and good wear resistance of internal and external keys, it greatly satisfies the special requirements of rotary
drilling machine.

Strict selection of steel grade to make sure strength at the max torque.

Senior technical experts provide technical support solutions.

Customized solutions according to customer needs.

Company profile

The corporation manufactures and processes have a full range of productions. Nearly hundreds of varieties of products are sold to big and medium-sized cities, enjoying praises from experts and top-class giants including China Railway Engineering Corporation, China State Construction Engineering Corporation and China Communications Construction. The corporation’s potential market is huge.With the vision of “Keeping ahead and breaking new ground”, Langfang Yilunkai Group spares no efforts to creating social wealth and winning over greater benefits for the customers. Since its establishment, the Group has been adhering to the principle of “Quality, credit and client come first”. It refined upon the R&D of new products and strictly observed scientific management and standard operation, blazed new trails while pursing diligence and pragmatic, eventually enhanced customer satisfaction through continuously improvement. Through years of perfect management and running, it won its market and grew into an internationally influential group and pioneered in the peer with mechanized manufacturing of high-quality products. With the full-force surging of reform, the realization of a moderately prosperous society, and the blessing of “the Belt and Road Initiative”, Yilunkai Group will seize this opportunity to stride forward to a brighter future.