Products Description
Our Advantages
1.Cost Advantage
- 409 Stainless Steel Exhaust Pipe has a lower nickel content, making it a cost-effective alternative to austenitic stainless steel, ideal for mass-produced automotive exhaust components.
- 409/409L stainless steel possesses sufficient corrosion resistance and oxidation resistance to meet exhaust gas environment requirements.
2. Weld Quality
- Our pipes undergo pickling and passivation after welding to remove scale and enhance corrosion resistance. Mechanical polishing ensures the weld area has the same smoothness as the base material.
- The pipes are subjected to eddy current testing, metallographic analysis, and weld hardness testing to ensure defect-free welds and consistent hardness between the weld and base material.
3. Corrosion Resistance
- The 409 Stainless Steel Exhaust Pipe is made of high-quality 409 ferritic stainless steel, suitable for high temperatures, exhaust condensate, humidity, and road salt environments, with a continuous operating temperature of up to approximately 675°C.
- The pipes are tested with a spectrometer to ensure that the chemical composition of the raw materials meets ASTM A268 standards. Salt spray tests, condensate simulation tests, and high-temperature oxidation tests are conducted to ensure the corrosion resistance of the welds.
4. Excellent Formability
- Our pipes have excellent bending properties, capable of accommodating complex bends in compact automotive chassis layouts. Controlled annealing after welding restores the ductility of the pipes, allowing for bending, expansion, and hydraulic forming.
- The pipes undergo flattening tests and weld bending tests to ensure excellent formability.
5. Custom Processing Services
- TORICH provides non-standard customization services with an outer diameter tolerance of ±0.1mm and roundness ≤0.05mm. Surface treatments such as pickling and passivation, bright annealing, black oxide treatment, and sandblasting are available upon customer request.
- We offer bending services, including U-bends, multi-radius bends, and complex geometric shapes, as well as end forming, precision cutting, and precise drilling of exhaust holes and mounting holes.
application areas
- Exhaust pipes and tailpipes
- Mufflers and silencers
- Catalytic converter inlet and outlet pipes
- Exhaust systems for passenger cars, trucks, and commercial vehicles
Chemical Composition
| Element | C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|---|
| 409 | ≤0.08 | ≤1.00 | ≤1.00 | ≤0.040 | ≤0.030 | 10.5–11.75 | ≤0.50 |
| 409L | ≤0.03 | ≤1.00 | ≤1.00 | ≤0.040 | ≤0.030 | 10.5–11.75 | ≤0.50 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation (%) | Hardness (HB) |
| 409 | ≥380 | ≥170 | ≥20 | ≤200 HB |
| 409L | ≥380 | ≥170 | ≥20 | ≤200 HB |
Possible Alternative Grades
| Alternative Grades | Reasons |
| 439 | It possesses superior corrosion resistance and oxidation resistance, and is commonly used in mid-to-high-end exhaust systems. |
| 441 | It exhibits excellent high-temperature strength and thermal fatigue resistance, making it suitable for applications exposed to high exhaust temperatures. |
| 436 | It offers resistance to pitting and condensation corrosion, and is often used in exhaust components requiring strong corrosion resistance. |
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Why is 409/409L stainless steel widely used in automotive exhaust systems?
A: 409/409L stainless steel achieves the best balance in terms of cost, corrosion resistance, and high-temperature performance. It is more resistant to exhaust gas oxidation, acidic condensates, and thermal cycling than carbon steel or aluminized steel, while being more cost-effective than 304/316 stainless steel.
Q: Will 409 stainless steel exhaust pipes rust?
A: 409 stainless steel may experience surface discoloration or slight rusting over time, especially in lower temperature or humid sections of the exhaust pipe. This is only surface oxidation and does not affect structural integrity or service life. This is considered normal and widely accepted in automotive exhaust systems.
Q: How is the welding quality of 409/409L welded steel pipes ensured?
A: We ensure complete weld penetration and uniform weld structure through online eddy current testing of the weld seam, flattening, flaring, and expansion tests.
Hot Tags: 409 stainless steel exhaust pipe, China, suppliers, manufacturers, factory, customized, wholesale, price, OEM, mill, producer, for sale
