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概括了１８３６～１８８５年无缝钢管生产技术的历史状况。从最初的挤压→冲压→锻造钻削，热轧／冷拔，延伸→斜轧（倾斜轧制），到曼内斯曼两兄弟发明斜轧穿孔工艺，无缝钢管生产由此揭开了新的篇章。
Summarizes the 1836 ~ 1885 seamless steel pipe production technology history. From the initial extrusion → stamping → forging drilling, hot / cold drawing, extending → oblique rolling (tilting rolling) to the Mannesmann brothers invented the process of oblique rolling, seamless steel pipe production opened New chapter.