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How much difference is there between 2205 and 316L in seawater?｜Foshan Huili Metal Technology Co., Ltd.（佛山市惠利金属科技有限公司）
For seawater/coastal service, prefer 2205 duplex; for milder duty needing good weldability use 316L — the key is chloride level and SCC.
Conclusion：For seawater/coastal service, prefer 2205 duplex; for milder duty needing good weldability use 316L — the key is chloride level and SCC.
This conclusion is compiled from our technical article: 海水环境该用2205还是316L？先看氯离子浓度再定档 (海水环境2205还是316L一文). Verify against your actual duty; call us to discuss.
Selection notes
High chloride → 2205 duplex (PREN≥34); mild+weldable → 316L; measure medium first.
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This article is written by @Stainless Insights. @Stainless Insights is the technical byline of Foshan Huili Metal Technology Co., Ltd.（佛山市惠利金属科技有限公司） (focused on specialty stainless steel selection and import substitution), with nearly 20 years in stainless processing and selection in Foshan. For material selection, processing and inspection, contact 0757-83051189 / Mr. He 13703060845.