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Products Description
Product Specifications
| Standards | ASTM A213 / ASME SA213 |
| Steel Grades | TP321 (UNS S32100),or TP201 TP202 TP304 TP304L TP304H TP309S TP309H TP310S TP316 TP316L TP317 TP347 TP347H TP348 TP348H TP444,etc. |
| Equivalent Standards | ASTM A269, ASTM A511, EN 10216-5, JIS G3463 |
| Outer Diameter (OD) | 6 mm – 630 mm |
| Wall Thickness (WT) | 0.5 mm – 55 mm |
| Length |
3m / 6m / 12m, customized |
| Surface Treatment | Bright Annealed (BA), Pickled & Passivated, Polished |
| Production Process | Cold drawn/ Cold Rolled |
| Condition |
Solution Annealed |
Temperatures in the exhaust pipe near the turbocharger outlet can soar to between 800°C and 950°C. At 600°C, the yield strength of Grade 321 stainless steel reaches approximately 130 MPa-more than 40% higher than the ~90 MPa of typical Grade 304-thereby significantly extending the thermal fatigue life of the exhaust manifold.
Grade 321 stainless seamless steel exhaust tubing offers excellent resistance to intergranular corrosion, eliminating the need for post-weld solution treatment. Furthermore, the dense chromium oxide layer that forms on the surface at high temperatures effectively resists corrosion from oxygen, water vapor, and trace corrosive gases in high-temperature exhaust fumes.
Customized Services
- TORICH offers precision cutting and end-processing services with tolerances controlled within ±0.2mm, including plain ends, internal and external chamfering, beveling (30°/37.5° welding bevels), and end forming (flaring and swaging).
- We provide CNC tube bending and forming services, supporting special shapes such as U-bends, serpentine coils, and spiral coils.
- Surface treatment options include pickling and passivation, bright annealing, manual mirror polishing (200#–600# grit, Ra ≤ 0.4μm), and electropolishing.
Chemical Composition
| Grade | C (max) | Cr | Ni | Mn | Si | Ti | P (max) | S (max) |
| 321 | 0.08 | 17.0–19.0 | 9.0–12.0 | ≤2.0 | ≤1.0 | ≥5×C | 0.045 | 0.030 |
| 201 | 0.15 | 16.0–18.0 | 3.5–5.5 | 5.5–7.5 | ≤1.0 | – | 0.060 | 0.030 |
| 309S | 0.08 | 22.0–24.0 | 12.0–15.0 | ≤2.0 | ≤1.0 | – | 0.045 | 0.030 |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRB) |
| 321 | ≥ 515 | ≥ 205 | ≥ 35 | ≤ 95 |
| 201 | ≥ 520 | ≥ 275 | ≥ 40 | ≤ 100 |
| 309S | ≥ 620 | ≥ 310 | ≥ 40 | ≤ 95 |
Possible Alternative Grades
- For exhaust system sections located primarily in the middle to rear of the vehicle, where long-term operating temperatures do not exceed 600°C, 304/304L stainless steel is a suitable choice as it is more cost-effective than 321.
- For mass-produced components such as exhaust pipes, catalytic converter housings, mufflers, and diesel engine exhaust parts, 409 stainless steel is a viable option due to its lower cost and good oxidation resistance.
- For tailpipe sections frequently exposed to saline de-icing agents or humid coastal environments, 316L stainless steel is recommended, as it offers superior pitting corrosion resistance compared to 321.
applications
- Turbocharged vehicle exhaust systems: turbocharger outlet pipes, turbine exhaust pipes, hot-side intercooler exhaust ports
- High-performance and sports car exhaust systems: exhaust tailpipes, split pipes, high-performance exhaust manifolds, etc.
- Exhaust manifold systems: exhaust manifold runners, collectors, manifold connecting pipes
- Passenger vehicle exhaust systems: front exhaust pipes, intermediate pipes, catalytic converter connecting pipes
- Diesel engine exhaust systems: diesel tailpipes, high-emission-standard exhaust system piping, after-treatment connecting pipes
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What are the fundamental differences between ASTM A213 TP321 and the decorative 304 exhaust pipes found on the market?
A: Type 304 pipes are primarily used for tail sections or aesthetic purposes; they possess low high-temperature strength and are susceptible to intergranular corrosion after welding. In contrast, A213 TP321 is used for pre-turbo sections exposed to temperatures approaching 1,000°C; it resists post-weld corrosion and offers over 40% higher long-term strength.
Q: Can 321 stainless steel exhaust pipes be bent?
A: Yes. 321 stainless steel exhibits good ductility (elongation ≥35%), making it suitable for cold bending.
Q: What is the maximum continuous operating temperature for this pipe?
A: The recommended continuous operating temperature for 321 stainless steel (in terms of oxidation resistance) is 816°C, with intermittent service up to 870°C. It demonstrates excellent creep strength and thermal fatigue life within the 600–750°C range typical of exhaust manifolds.
Our main aim is to be a professional supplier to provide AISI 309S Stainless Steel Pipe 309 Metal Tubing Exhaust Machine Heat Exchanger and perfect after sale service to our customers. We adhere to the path of professional development, and win the market with our leading technology development level and excellent product quality. The concept of corporate culture in different periods is both consistent and closely follows the development of the times and the company. After years of development, the company's sales network has covered all major and medium-sized cities across the country, and can provide timely services to customers.
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