大直徑無縫鋼管反擠壓沖孔和頂管拔伸+斜軋組合生產(chǎn)工藝的研究及實踐

Research and Application of Process Combining Backward-extrusion Piercing with Push Bench Drawing+Cross-rolling for Manufacture of Large-sized Seamless Steel Tubes

摘要: 反擠壓沖孔和頂管拔伸+斜軋生產(chǎn)工藝組合靈活,適用于生產(chǎn)大直徑,特厚、薄壁,高附加值特種無縫鋼管,其成品幾何尺寸精度高,表面質(zhì)量好。該組合工藝與單純斜軋和大頂管生產(chǎn)工藝相比有一定進步。采用大直徑斜軋穿孔、均整、定徑新工藝技術生產(chǎn)可部分替代現(xiàn)有的連軋+旋擴的生產(chǎn)工藝,屬大直徑薄壁無縫鋼管生產(chǎn)領域的一種新實踐。

Abstract: The combined process involving backward-extrusion piercing and push bench drawing plus crossrolling is flexible,and so suitable for manufacturing high value-added special seamless steel tubes like the large-sized,extra-heavy walled or light-walled ones featuring tight dimensional tolerances and fine surface quality.Compared with the conventional cross-rolling process or the extrusion process,the combined process is rather advanced.This process partially substitutes the new techniques such as cross-rolling/piercing,reeling and sizing of large-sized workpieces for the mandrel mill rolling+rotary expanding process,being a pilot practice in the field of manufacture of large-sized,light wall seamless steel tubes.