Production process of internally threaded seamless steel tube

• Main Author: ZHOU YIXIN
• Format: Patent
• Language: Chinese; English
• Published: 24.03.2020
• Subjects: AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING

The invention discloses a production process of an internally threaded seamless steel tube, which comprises the steps of 1) length and surface treatment of a tube blank; 2) perforation; 3) tube rolling; 4) diameter reduction; 5) measurement; 6) pre-heat treatment; 7) cooling and surface treatment; 8) cold drawing; 9) post-heat treatment; 10) inspection and correction. The invention belongs to thetechnical field of steel tube production, and particularly provides a production process of an internally threaded seamless steel tube, which is characterized in that the hot rolling of a tube and thecross-section shape after the hot rolling of the tube are controlled to reduce the deformation quantity of the material in the cold drawing process, reduce the cold drawing difficulty and improve thecold efficiency and the tube strength, the internal stress of material before cold drawing is eliminated through heat treatment so as to avoid the bucket grain defect after cold drawing, the surfacesmoothness of the material b