| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a core material for manufacturing a catheter tube, to be easily stretched with low loads, to be hardly stuck to a resin, to be easily made straight, to be hardly injured, to be easily and inexpensively manufactured, suitable for manufacturing the catheter tube by forming a resin coating layer on the outer surface of the linear core material and pulling out the core material thereafter. <P>SOLUTION: The base metal of the core material is soft iron including carbon less than 0.03 wt.%. A Zn-plated layer with 1-5 μm thickness is formed on the surface of the core material, and a diffusion layer in which Zn is diffused in Fe is formed on the inner side of the Zn-plated layer of the core material. Accordingly, a wire made of 0.02C electromagnetic soft iron is softened and annealed in an inert gas at 700 °C or higher (a), extended to make the wire with 0.4-2 mm diameter (b), and the surface of the wire is electrolytically plated with Zn to form the Zn-plated layer with 1-5 μm thickness (c). Then, the wire is diffusion-annealed in the inert gas at 420-600 °C. <P>COPYRIGHT: (C)2008,JPO&INPIT |
