Muffler Steel Tube (Automotive Exhaust, 409 / 439 / 304, Aluminized / SS, Mandrel-Bent)
- Model
- MESCO-MUF-TUBE
Item specifics
- Material
- Stainless Steel / Aluminized Steel
- Grade
- ASTM A249 / A268 — 409, 439, 304; AL-Coated 409 / 441
- Form
- Round / Oval / Mandrel-Bent
- OD
- 25.4 – 101.6 mm (1" – 4")
- Wall
- 1.0 – 2.5 mm
- Length
- ≤ 6 m (or cut-to-length)
- Finish
- Mill / Aluminized / Polished
- Tolerance
- OD ±0.1 mm; Wall ±10%
Review
Description
Automotive muffler steel tubes — stainless and aluminized, round / oval / mandrel-bent, engineered for exhaust system durability and corrosion resistance. MESCO supplies muffler steel tubes for automotive exhaust systems in stainless grades 409, 439 and 304, plus aluminized variants 409 and 441. Tubes are produced to ASTM A249 / A268 with OD 25.4 to 101.6 mm (1" to 4") and wall 1.0 to 2.5 mm. Available forms include round, oval and mandrel-bent configurations, with end forming, swaging and bell-mouth services for OEM and aftermarket exhaust assemblies. 439 offers better corrosion resistance and weldability than 409 thanks to its higher Cr content (18% vs 11%) and Ti/Nb stabilization. For long-life OEM mufflers exposed to salt and moisture, 439 is recommended. For cost-sensitive aftermarket and warm-climate use, 409 is acceptable. Yes. We supply aluminized Type 1 (Al-Si, ~10% Si) coating on 409 and 441 substrates per ASTM A463. Aluminized tubes provide 3-5x better salt-spray resistance than uncoated carbon steel and are widely used in aftermarket mufflers and exhaust pipes. Yes. Mandrel bending keeps the inner wall of the bend flat (no wrinkles), which is critical for exhaust gas flow. We offer CNC mandrel bending up to 180° with bend radius from 1.5 × OD. Induction bending is also available for large-diameter tubes with thin walls. Common wall thicknesses are 1.2, 1.5, 1.65, 2.0 and 2.5 mm. For OEM passenger car mufflers, 1.2-1.5 mm is standard. Heavy-duty truck and industrial exhaust typically use 2.0-2.5 mm walls for vibration and corrosion margin.
Muffler Steel Tube (Automotive Exhaust, 409 / 439 / 304, Aluminized / SS, Mandrel-Bent)
Specifications & Capabilities
Grade Comparison — 409 vs 439 vs 304
Aluminized vs Stainless for Exhaust
Forming — Round / Oval / Mandrel-Bend
Weldability & Corrosion Resistance
Typical Grade & Size Range
Parameter Value Material Stainless Steel (304 / 304L / 316 / 316L / 430) Standard ASTM A240 / A480 / A312 / A213 (per product family) Finish 2B / BA / No.4 / HL / 8K / Mill / Polished Thickness / OD Custom range per family (see attributes table) MOQ 1 ton (or as agreed) Frequently Asked Questions
409 vs 439 — which is better for mufflers?
Are aluminized tubes available?
Can you supply mandrel-bent tubes?
What is the typical wall thickness?
Why Choose MESCO
Factory DirectIntegrated steel mill with 18+ years export experience
Certified QualityISO 9001, ASTM / EN / JIS compliant, full MTC provided
Global LogisticsContainer, break-bulk and LCL options with CIF / FOB terms
Custom ServiceSlitting, cutting, polishing, end forming & OEM packaging
