Introduction

409 Stainless Steel Exhaust Pipe (SS 409 Exhaust Pipe, AISI 409, UNS S40900, Ferritic Stainless Steel Exhaust Pipe) is the industry standard for automotive exhaust systems. It conforms to ASTM A268 TP409, ASTM A240 Type 409, and EN 1.4512 (DIN 1.4512 / JIS SUS409). This heat resistant exhaust tubing offers excellent oxidation resistance, thermal fatigue resistance, and good weldability at a lower cost than 304 stainless steel, making it the preferred material for OEM and aftermarket exhaust components.

• High temperature oxidation resistance – withstands exhaust gas temperatures up to 750°C (1380°F) with minimal scaling

• Thermal fatigue resistance – resists cracking from repeated heating and cooling cycles in exhaust systems

• Cost effective exhaust material – lower chromium (10.5‑11.7%) and no nickel, offering significant savings over 304

• Automotive grade stainless steel – widely accepted by vehicle manufacturers for mufflers, pipes, and catalytic converter shells

• Good formability and weldability – suitable for mandrel bending, stamping, and robotic welding in high‑volume production

Our 409 stainless steel exhaust pipe is available in welded tube (ASTM A268), mandrel bent, aluminized 409 exhaust tubing, thin wall exhaust tubing, and custom exhaust pipe fabrication. We supply OEM exhaust pipe material and aftermarket exhaust pipe in standard automotive sizes (2″, 2.5″, 3″, 4″ OD, metric sizes), with polished or raw finishes.

Specifications & Process Options

We provide 409 Exhaust Tubing Size Chart, Pipe Dimensions, Wall Thickness guide – request yours.

Applications

1. Automotive Exhaust Systems – OEM & Aftermarket

• 409 stainless steel exhaust pipe for automotive exhaust systems – complete exhaust lines from manifold to tailpipe for passenger cars, light trucks, and SUVs. High temperature oxidation resistance prevents scale flaking inside pipes, avoiding clogging of catalysts and mufflers.

• 409 exhaust tubing for mufflers – muffler shells, inlet/outlet tubes, and internal baffles. Ferritic stainless steel exhaust material dampens vibration and resists thermal fatigue from exhaust pulsing.

• 409 stainless steel exhaust pipe for catalytic converters – converter shells and heat shields. Good formability allows precise stamping of complex can shapes, while oxidation resistance extends converter life.

2. Heavy Duty & Commercial Vehicle Exhaust

• 409 stainless steel exhaust pipe for heavy duty vehicles – exhaust stacks, flex pipe sections, and diesel particulate filter (DPF) housings in trucks, buses, and off‑highway equipment. Thermal fatigue resistance withstands high‑load, long‑duration operation.

• 409 stainless steel exhaust pipe for truck exhaust systems – Class 8 truck exhaust pipes, mufflers, and elbows. Cost effective exhaust pipe material reduces fleet maintenance costs compared to mild steel.

3. Tailpipes & Diesel Exhaust Systems

• 409 stainless steel exhaust pipe for tailpipes – visible tailpipe extensions and exhaust tips. Polished 409 exhaust pipe offers a bright finish at lower cost than 304.

• 409 stainless steel exhaust pipe for diesel exhaust systems – EGR cooler tubes, diesel oxidation catalyst housings, and exhaust gas recirculation lines. Good corrosion resistance to acidic condensate (sulfuric/nitric acids) in diesel exhaust.

4. Mandrel Bent & Custom Exhaust Fabrication

• Mandrel bent 409 exhaust pipe – smooth bends for performance and OEM replacement exhaust systems. Thin wall exhaust tubing maintains flow area without wrinkling.

• Aluminized 409 exhaust tubing – provides additional corrosion protection for exterior exhaust components in salt‑belt regions (coated after forming).

• Aftermarket exhaust pipe manufacturer – custom diameter, length, and bend configurations for replacement exhaust kits.

Why Choose Us as Your 409 Stainless Steel Exhaust Pipe Supplier?

We are a leading 409 stainless steel exhaust pipe supplier, 409 exhaust tubing manufacturer, automotive exhaust pipe supplier, muffler pipe stainless steel specialist, and China 409 stainless steel exhaust pipe factory. All products meet ASTM A268/A240 with mill test certificates, chemical analysis, and mechanical property reports.

What we offer:

• Sizes: 1.5″ – 6″ OD; 2″, 2.5″, 3″, 4″ in stock; metric OD 63.5mm, 76.2mm

• Wall thickness: 1.2mm, 1.5mm, 2.0mm (thin wall exhaust tubing)

• Forms: welded tube, mandrel bent pipes, aluminized, polished, OEM exhaust material

• Custom: custom bends, cut‑to‑length, exhaust system fabrication

• Fast global shipping to exhaust system manufacturers, muffler shops, and automotive parts distributors

Contact us for 409 Exhaust Tubing Size Chart, Pipe Dimensions, or a quote on your exhaust pipe requirements.

MONO Group is one of 409 Stainless Steel Exhaust Pipe and other stainless steel Manufacturer, Supplier, Wholesaler from China, We can supply ASTM / DIN / ISO / GB stndard high quality alloy plate, sheet, round bar, tube, pipes, fittings, flange, pls contact us freely for your RFQ to info@monokj.com