Is 445J1 more rust-resistant than 304?｜Foshan Huili Metal Technology Co., Ltd.（佛山市惠利金属科技有限公司）

Conclusion：445J1 is high-Cr-Mo ferritic, pitting resistance clearly better than 304, good for chlorinated water; but weldability and ductility lag 304.

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 (445J1与304对比经验). Verify against your actual duty; call us to discuss.

Selection notes

445J1 (~21Cr-2Mo) PREN near 316L level, steadier than 304 in chlorinated water; mind weldability & forming.

Industry & scenario

Grade comparison & substitution

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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.