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医疗器械 · 316L · 17-4PH · 选型

医疗器械用不锈钢怎么选:316L、17-4PH 与 420 的分工

316L 用于一般器械与植入辅助件,17-4PH 用于高强度器械,420 用于刀具。还要看清洁、灭菌与生物相容性要求。
医疗器械不锈钢选型通常围绕耐蚀、强度与清洁灭菌:
• 316L(1.4404):耐蚀与生物相容性较好,用于手术器械手柄、支架、植入辅助件、不锈钢管路;需控制夹杂物与表面质量。 • 17-4PH(630):沉淀硬化,强度可达 1000 MPa 以上,用于骨科器械、高强度部件;需按状态(H900/H1025)使用。 • 420/440C 马氏体:硬度高,用于手术刀片、剪刀刃口;耐蚀性相对弱,需防锈管理。
关键要求:
1) 清洁与灭菌:反复高温高压灭菌要求材料稳定、表面易清洁; 2) 表面质量:Ra 越低越不利于细菌残留,镜面/钝化是关键; 3) 生物相容性:与人体接触的部件按 ISO 10993 评估; 4) 可追溯:要求炉批号、材质证明与工艺记录。
采购提醒:不要只看牌号,要同时约定表面粗糙度、钝化与清洁度要求;医疗件供应商通常需要 ISO 13485 体系。
Compiled by SteelWe editors and industry experts. For industry exchange only; not trading or investment advice. Cite the source when quoting.
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