Xinxing Special Pipe, a partner of Wuxi Chengjiu, has successfully applied for a patent for “17Cr Stainless Steel Seamless Pipe for Oil Well Drilling and Its Preparation Method.” The application publication number is CN118360550A, and the application date is April 19, 2024.
This invention relates to the field of seamless steel pipe forming technology and discloses a 17Cr stainless steel seamless pipe used for oil well drilling and its preparation method. The seamless steel pipe optimizes the content of Cr, Ni, and Mo, reducing raw material costs.
The preparation method involves several steps: billet forming, billet forging, billet annealing, rough machining, precision machining, hot reaming, hot extrusion, heat treatment, and straightening. Additionally, a head pad is created, with one end of the head pad’s small bell mouth welded to one end of the billet, serving as the starting end for reaming and extrusion. The extrusion die parameters are adjusted to reduce extrusion force.
This invention improves surface quality, reduces cracks and fold defects, and increases the yield rate.
The successful application of this patent marks a significant advancement in the production of stainless steel seamless pipes for oil well drilling, showcasing improved efficiency and reduced costs in the manufacturing process.