Manufacturing method of ultra-large-diameter thick-wall seamless steel pipe

• Main Authors: GUO WENBIN, WANG YANLING, MA QINGWEN, DU HONGQIANG, YAO JIANQING, WANG JIAOQI, LI TING, QIN RUITING, WANG YUBAO
• Format: Patent
• Language: Chinese; English
• Published: 15.03.2022
• Subjects: FORGE FURNACES; FORGING; HAMMERING; MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PRESSING METAL; PUNCHING METAL; RIVETING; TRANSPORTING

The invention discloses a method for manufacturing an ultra-large-diameter thick-wall seamless steel pipe, which comprises the following steps of: before forging and forming, continuously processing a blank through blank manufacturing and extruding procedures; forging and chambering are conducted after the blank is heated, two times of mandril sleeving and shaping are adopted in the forging and chambering process, heat treatment is conducted after forging and chambering, and the large-caliber thick-wall seamless steel pipe is prepared. The extrusion-forging combined forming mode is adopted, and the problems that the ultra-large-diameter thick-wall pipe fitting is difficult to forge thoroughly and the chambering difficulty is large are solved. 本发明公开了一种超大口径厚壁无缝钢管的制造方法，包括：在锻造成型前，通过制坯、挤压工序继续加工坯料；坯料加热后进行锻造扩孔，锻造扩孔过程中采用两趟次套芯棒整形，锻造扩孔后热处理，制备成大口径厚壁无缝钢管。本发明采用挤压-锻造联合成型方式，解决了超大口径厚壁的管件难锻透，扩孔难度大的问题。