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316 · 316L · 高温 · 焊接

316 与 316L 的区别:高温强度 vs 焊接耐蚀

316 碳含量较高、高温强度更好;316L 低碳、焊接后耐蚀更好。高温承压与焊接结构要按标准选,不要随意互换。
316 与 316L 都含钼(约 2%–3% Mo),区别与 304/304L 类似:
• 316:C 0.04%–0.10%(视标准),高温强度与蠕变性能较好,常用于高温承压部件; • 316L:C ≤0.03%,焊后耐晶间腐蚀更好,是化工、食品、医疗设备的常用牌号。
选择要点:
1) 高温(>450°C)承压、按设计规范要求 316 的场合 → 不要用 316L 直接替代; 2) 焊接结构、常温腐蚀环境 → 316L 更稳妥; 3) 双标采购时核对 C 含量范围与力学保证值; 4) 316H(高碳)用于更高温场景,需按规范评估。
一句话:316 与 316L 不是简单"升级关系",而是针对不同温度与焊接条件的两条路线。
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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