Mining pipes (steel pipes for supporting frames in mining tunnels)
1.Comprehensive Process Control
Yuantai Derun provides the strictest tolerances in the industry. The reason why we are able to do this is because we have developed proprietary processes. For example, to ensure strict control of eccentricity (+/-5%), we provide a very high cross-sectional reduction during the cold drawing process. Similarly, Yuantai Derun uses its own developed special surface treatment process to ensure good dimensional control and surface cleanliness after heat treatment. Similarly, to ensure good surface finish, all cold drawing molds of Yuantai Derun are made of special materials (such as tungsten carbide) or coated with TiN. For applications that require excellent surface finish, we also offer bright annealed tubes.
Yuantai Derun's mining steel pipes are manufactured according to the following standard specifications, grades, dimensions, and tolerances. In addition to standard pipes, we also produce steel pipes according to customer specific requirements.
For drill pipe, Yuantai Derun has developed a unique process that allows us to ensure an extremely low residual circumferential stress of 65 MPa (maximum). More information about this special product (used for very demanding drilling conditions) can be provided upon request.
Yuantai Derun understands the importance of pipeline straightness in the mining industry. Therefore, we conduct a strict 5-point TIR straightness check and correction program for each pipe, paying special attention to the straightness of the pipe end. By doing so, we ensure a straightness of 1/6000 or better.
4. Specification table for mining pipes