Pipe expanding can clearly own the mechanical hardness function and pipe strength after expanding has been raised.
钢管扩径具有非常明显的加工硬化作用，扩径后钢管强度较扩径前普遍升高。
The utility model discloses a special-shaped pipe expanding plunger chip and relates to a special-shaped pipe shaping tool.
本实用新型公开了一种异型扩管冲头，涉及一种异型管成型工具。
The aim of the utility model is to design a special-shaped pipe expanding plunger chip with high pipe expanding efficiency and good quality.
本实用新型的目的是设计一种扩管效率高且质量好的异型扩管冲头。
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