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食品设备 · 304 · 316L · 卫生设计

食品设备不锈钢选型:304 还是 316L,表面要多光

一般食品接触用 304,酸性/含盐/清洗剂强则用 316L;卫生设计看表面 Ra、焊缝质量与是否易清洗。
食品与饮料设备选材围绕「耐蚀 + 卫生」:
1) 牌号:一般食品接触(水、乳品、谷物)304 常用;酸性介质、含盐、含氯清洗剂(如次氯酸钠)环境优先 316L; 2) 表面:接触面通常要求 Ra ≤0.8μm(视规范),采用 2B/BA 或抛光;焊缝需平整、无氧化色、酸洗钝化; 3) 卫生设计:避免死角、缝隙与积液;管道坡度与排空;密封件选食品级; 4) 标准:可参考 EHEDG、3-A 卫生标准与客户规范; 5) 验证:清洗验证(CIP)与钝化记录。
常见误区:
• 以为 316L 就不会腐蚀——含氯清洗剂浓缩残留仍会点蚀; • 只关注牌号忽略焊缝与表面——微生物残留常发生在焊缝与粗糙表面; • 用碳钢刷/工具清理——带来游离铁污染。
采购建议:在技术协议中写明牌号、表面 Ra、焊缝要求、钝化与清洗验证要求。
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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