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201 · 304 · 节镍 · 成分检测

201 和 304 的差别:用锰代镍省下的成本,可能花在耐蚀上

201 以 Mn 部分替代 Ni,价格低,但耐蚀与成型稳定性弱于 304,潮湿/含氯环境风险高,采购需按用途判断。
201(1.4372 类)属于节镍型奥氏体不锈钢,用锰(Mn)和氮(N)部分替代镍(Ni),成本明显低于 304。
需要关注的差异:
• 耐蚀:201 的铬含量与 304 接近,但镍低、锰高,在潮湿与含氯环境中点蚀与锈蚀风险更高; • 磁性:201 冷加工后更容易出现明显磁性; • 成型:201 加工硬化速率更快,深冲与多次折弯更易开裂; • 焊接:焊接热裂与耐蚀下降风险高于 304。
适用边界:
1) 干燥室内、低腐蚀、外观件:201 可降低成本; 2) 厨具接触水、沿海、户外、食品设备:不建议用 201 替代 304; 3) 出口或客户指定牌号:严格按图纸与合同牌号执行,不擅自替代。
采购建议:让供方在质保书注明 Cr/Ni/Mn 实测值,并确认使用环境;用 201 冒充 304 属于常见风险,可通过成分检测识别。
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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