To produce hollow tubes, which can satisfy the requirements of direct rolling in casting conditions, is the key to realize continuous casting-direct rolling of hollow tubes.
如何获得优质空心管坯使其能够满足在铸态下直接轧制的要求，是实现空心管坯连铸连轧，即管材近终形制造技术的关键。
To produce hollow tubes, which can satisfy the requirements of direct rolling in casting conditions, is the key to realize continuous casting-direct rolling of hollow tubes.
如何获得优质空心管坯使其能够满足在铸态下直接轧制的要求，是实现空心管坯连铸连轧，即管材近终形制造技术的关键。
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