A 304 water tank rusted near the weld after six months — did we pick the wrong material?｜Foshan Huili Metal Technology Co., Ltd.（佛山市惠利金属科技有限公司）

Conclusion：304 pits easily under chlorinated + heated duty; for long-term chlorinated tap-water tanks prefer high-Cr-Mo ferritic like 445J1.

This conclusion is compiled from our technical article: 自来水厂水箱该用304还是445J1？余氯和温度是关键 (水厂水箱304还是445J1一文). Verify against your actual duty; call us to discuss.

Selection notes

304 pits under chlorinated+heated duty; prefer 445J1 high-Cr-Mo ferritic for storage.

Industry & scenario

Failure cases

You may also ask

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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.

Spell out the working conditions — we handle the rest

Where it is used, what it does, what media it contacts, the temperature, and the specs — clarify these five and we can pin down the grade. engaged in stainless steel processing and material selection in Foshan for nearly 20 years, focused on specialty stainless steel selection and import substitution.