Can 439 replace 304 for exhaust pipe?｜Foshan Huili Metal Technology Co., Ltd.（佛山市惠利金属科技有限公司）

Conclusion：Automotive exhaust uses 439 (ferritic, heat-oxidation & fatigue resistant) as standard — more suitable and nickel-saving than 304; muffler hot-corrosion sections may use 304/409.

This conclusion is compiled from our technical article: 430、436、439、443、444到底差在哪？一张耐蚀梯度表说清 (439与304排气对比经验). Verify against your actual duty; call us to discuss.

Selection notes

439 Nb-stabilized ferritic is exhaust-standard, better fatigue than 304, cheaper; hot-corrosion muffler section may use 304/409.

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.