rolling barrel

The book gives a brief introduction to the 100 years' seamless steel production history ( 1855~ 1951) and especially describes the invention of cross-rolling piercing mill and pilger mitl by Mannesmann brothers and the findings of conical roll and barrel roll piercing mills by Stiefel.

简要介绍了近百年（1855～1951年）来无缝钢管发展历史。特别介绍了曼内斯曼兄弟对斜轧穿孔机和周期式轧管机的发明过程以及斯蒂费尔对锥形辊和菌式辊穿孔机的发现过程。

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Manufacturing subsurface pump barrel by cold-drawing and cold-rolling

用冷拔冷轧方法制造整筒式抽油泵泵管

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