This kind of granular structure is less harmful to the properties of the alloy than the needle like iron phase, and even can be functional to strengthen structure.
这种粒状组织，与针状铁相相比，对合金性能的影响要小得多，甚至可以起到强化组织的作用。
Thereby, the invention has the advantages of simple structure, convenient use, capability of ensuring the consistent direction of the needle point, blood secondary pollution avoidance and the like.
因此，本发明具有结构简单、使用方便、能确保针尖方向一致以及避免血液二次污染等优点。
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