一种方法是使用空心坯，然后使用固定或浮动芯棒。
One way is to use a hollow billet and then use a fixed or floating mandrel.
空心管坯连铸技术被认为是管材生产更深层次的近终形制造技术。
Continuous casting of hollow tube is considered as a profound near net shape technology for pipe production.
介绍了一种新的奥氏体不锈钢无缝管材制备工艺，即对空心铸坯直接热挤压制备荒管。
A new processing technique for seamless tubes manufacture of austenitic stainless steel is introduced, in which hollow cast blank is directly used for hot extrusion.
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