大直径无缝钢管反挤压冲孔和顶管拔伸+斜轧组合生产工艺的研究及实践
대직경무봉강관반제압충공화정관발신+사알조합생산공예적연구급실천
Research and Application of Process Combining Backwardextrusion Piercing with Push Bench Drawing+Cross-rolling for Manufacture of Large-sized Seamless Steel Tubes
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