Application Case: Material Selection for Automotive Exhaust Systems

CASE

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汽车 · 应用案例 · 排气 · 铁素体

Application of 409/436/441 ferritic stainless steels and 304 in different sections of exhaust systems.

Exhaust system temperature decreases along the flow:

- Manifold and near-engine section: severe high-temperature oxidation; 441 or 444 ferritic stainless steel is commonly used, with Nb/Ti stabilization.
- Mid-section: 409/436, balancing cost and corrosion resistance.
- Tail section and muffler: 409 or 436; condensate corrosion is the main risk.

304 can also be used in some sections, but has high cost and large thermal expansion.

Key indicators: high-temperature oxidation resistance, thermal fatigue, condensate corrosion resistance (Cl- and pH).

Procurement note: ferritic steels have poor weldability and are sensitive to grain growth; welding process must be controlled.

本文由 SteelWe 编辑与行业专家整理，内容仅供行业交流参考，不构成交易或投资建议。引用请注明来源。

Application Case: Material Selection for Automotive Exhaust Systems

Application of 409/436/441 ferritic stainless steels and 304 in different sections of exhaust systems.

Exhaust system temperature decreases along the flow:

- Manifold and near-engine section: severe high-temperature oxidation; 441 or 444 ferritic stainless steel is commonly used, with Nb/Ti stabilization.
- Mid-section: 409/436, balancing cost and corrosion resistance.
- Tail section and muffler: 409 or 436; condensate corrosion is the main risk.

304 can also be used in some sections, but has high cost and large thermal expansion.

Key indicators: high-temperature oxidation resistance, thermal fatigue, condensate corrosion resistance (Cl- and pH).

Procurement note: ferritic steels have poor weldability and are sensitive to grain growth; welding process must be controlled.

本文由 SteelWe 编辑与行业专家整理，内容仅供行业交流参考，不构成交易或投资建议。引用请注明来源。