Home / All / Stainless Steel / Muffler Steel Tube (Automotive Exhaust, 409 / 439 / 304, Aluminized / SS, Mandrel-Bent)
Muffler Steel Tube (Automotive Exhaust, 409 / 439 / 304, Aluminized / SS, Mandrel-Bent)
Muffler steel tube in 409/439/304 and aluminized 409/441. Round, oval, mandrel-bent. Custom length.
| Share | |
|---|---|
| Categories | Stainless Steel |
| Brand | MESCO: Trusted Steel Wholesale Manufacturer |
| Model | MESCO-MUF-TUBE |
| 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% |
Detail Information
Muffler Steel Tube (Automotive Exhaust, 409 / 439 / 304, Aluminized / SS, Mandrel-Bent)
Automotive muffler steel tubes — stainless and aluminized, round / oval / mandrel-bent, engineered for exhaust system durability and corrosion resistance.
Request a QuoteMESCO 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.
Specifications & Capabilities
Grade Comparison — 409 vs 439 vs 304
- 409 — ferritic, 11% Cr, economical, good high-temperature oxidation resistance
- 439 — ferritic, 18% Cr, better weldability and corrosion than 409
- 304 — austenitic, 18% Cr / 8% Ni, premium corrosion and appearance
- Aluminized 409 / 441 — Al-Si coating adds salt-spray corrosion resistance
Aluminized vs Stainless for Exhaust
- Aluminized carbon steel — lower cost, up to 5 years salt-spray life
- Stainless 409 — 8-10 years life, suitable for most passenger car mufflers
- Stainless 439 / 304 — 10-15+ years life, premium and heavy-duty service
- Choose aluminized for cost-sensitive aftermarket; stainless for OEM warranty
Forming — Round / Oval / Mandrel-Bend
- Round tube — standard muffler body and resonator
- Oval tube — flat-form muffler, better ground clearance
- Mandrel bending — constant OD, no wrinkles at bend radius
- Bend radius typically 1.5 × OD, mandrel and induction bending available
Weldability & Corrosion Resistance
- 409 requires preheat (150-200 °C) for thick-wall welding
- 439 has better weldability; lower risk of HAZ grain growth
- 304 welds with standard austenitic procedures (TIG / MIG)
- All tubes pickled and passivated for consistent corrosion performance
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?
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.
Are aluminized tubes available?
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.
Can you supply mandrel-bent tubes?
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.
What is the typical wall thickness?
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.
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
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