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Utilizing 26 high-precision cold rolling mills and 6 cold drawing machines, we ensure dimensional accuracy and superior mechanical properties.
TP321 Titanium Stabilized Austenitic Pipe
Titanium Stabilized | UNS S32100 | Intergranular Corrosion Resistant
ASME SA312 | Aerospace & Refinery GradeRelated Products
Introduction
TP321 Titanium Stabilized Austenitic Pipe solves a problem that standard 304-type stainless cannot: sensitization during prolonged exposure to the 450°C-900°C range, where chromium carbides precipitate at grain boundaries and leave the material vulnerable to intergranular corrosion. TP321 addresses this by adding titanium at a minimum of five times the carbon content, so titanium — not chromium — combines preferentially with carbon to form stable titanium carbides during manufacturing and welding. Chromium therefore stays in solid solution near the grain boundaries, preserving the passive oxide layer that gives stainless steel its corrosion resistance even after the material has spent extended time in the sensitizing temperature range.
This stabilization makes TP321 the practical choice wherever post-weld heat treatment is impractical or impossible — such as field-welded expansion joints, aircraft and marine exhaust components, and process piping that will see repeated thermal cycling through the sensitizing range during normal operation. The titanium addition also improves creep strength modestly compared to unstabilized grades at temperatures up to roughly 800°C, and the pipe carries good resistance to polythionic acid stress corrosion cracking, a failure mode that specifically targets sensitized stainless in sulfur-bearing refinery environments during shutdown and startup.
TP321 pipe is manufactured seamless, hot worked and solution annealed, then supplied with full chemical certification confirming the titanium-to-carbon ratio meets the minimum 5xC requirement — a detail worth verifying on mill certificates, since under-stabilized material loses the corrosion benefit that defines the grade. Typical applications span aircraft collector rings and exhaust manifolds, refinery furnace tube supports and expansion bellows, and high-temperature ducting where repeated thermal cycling would otherwise sensitize an unstabilized grade over the service life of the equipment.
Specifications
| Material Grade | TP321 (UNS S32100) |
| Standard | ASTM A312, ASME SA312 |
| Outer Diameter | 10mm - 219mm |
| Wall Thickness | 1.0mm - 20mm |
| Length | Up to 12000mm |
| Finish | Solution Annealed, Pickled |
Chemical Composition
| C | Cr | Ni | Ti | Mn |
| ≤.08 | 17-19 | 9-12 | 5xC-0.70 | ≤2.0 |
Ti Stabilized Sensitization Resistant
Mechanical Strength
Comprehensive Info
| MOQ | 500kg |
| Lead Time | 20 - 35 Days |
| Testing | Ti/C Ratio Verification & Hydro |
| Max Service Temp | 800°C |
Key Applications
Aerospace Exhaust manifolds and collector rings
Refinery Furnace supports and expansion bellows
High-Temp Ducting Process ducting with cyclic thermal exposure
Advantages
No PWHT Required
Titanium carbides form preferentially, protecting weld zones.
PASCC Resistant
Resists polythionic acid stress corrosion cracking.
Creep Improved
Modest creep strength gain over unstabilized grades to 800°C.
Certified Ti Ratio
Mill certs confirm titanium meets the 5xC minimum requirement.
About Jiangsu Jend Tube Co.,Ltd.
As China TP321 Titanium Stabilized Austenitic Pipe Manufacturers and Wholesale TP321 Titanium Stabilized Austenitic Pipe Factory, Established in 2011 and is a manufacturing enterprise with a complete manufacturing cycle from raw material selection to finished product delivery. The company currently has more than 100 employees, covers an area of 30015 square meters, and has a registered capital of 48 million yuan, annual production capacity of 3800 tons.
The company has passed ISO9001:2015 quality certification, domestic pressure vessel TS certification, and foreign pressure vessel PED certification. With rich experience and mature technology, we have been expanding our market internationally. At present, our products are exported to more than 50 countries and regions including Europe, America, Southeast Asia, and the Middle East.
The company adheres to different production norms and standards such as the American standard (ASTM), the European standard (EN), the German standard (DIN), the Japanese standard (JIS), the Russian standard (GOST), and the Chinese standard (GB).
Our company specializes in and customizes various specifications of Martensite TP410 (0Cr13, 1Cr13), Ferrite TP405 (1Cr13Al), TP430 (1Cr17), TP444 (0Cr18Mo2), TP439, TP409 (0Cr11Ti), It is also proficient in manufacturing Austenitic seamless stainless steel pipes of series such as TP304(L/H), TP316(L/H/Ti), TP310S, TP317, TP321(H) and TP347(H). Duplex such as S31803, S2205, S32750, S32304, and Nickel-based alloys Monel400, Monel600, Monel800, GH3030, 904L, Inconel 625, etc.
The company mainly produces seamless steel pipes with the following specifications: outer diameter: 3.18mm to 406.4mm, wall thickness: 0.3mm to 20mm, and the longest length is 25000mm. Additionally, it can customize seamless steel pipes with special materials and specifications according to customer requirements. The company attaches great importance to scientific innovation. The staff of the company vigorously develop technological research and development.
Jiangsu Jend Tube Co.,Ltd. will continuously accumulate professional knowledge and capabilities, striving to become a leader in the domestic market and even the world market. Strive to be the most reassuring pipe manufacturing enterprise for customers.
Precision Manufacturing and Process Optimization
We rely on precision equipment and optimized production technologies to achieve outstanding mechanical performance and consistent product quality.
Cold Rolling and Cold Drawing
Solution Heat Treatment
Natural gas solution treatment furnaces and BA solution treatment furnaces optimize the material's grain structure, enhancing corrosion resistance.
Precision Straightening and Polishing
10 straightening machines and 8 finishing polishing machines guarantee product surface smoothness and dimensional accuracy.
Automated Inspection and Quality Assurance
Real-time monitoring systems ensure the stable quality of every batch of products.
Usage Tips
Verify Stabilization
Always check the mill certificate for the titanium-to-carbon ratio; under-stabilized heats lose the intergranular corrosion benefit.
Field Welding
TP321 is well suited to field welds without subsequent heat treatment, but matching filler metal (321 or 347 type) should still be used.
Services
Bending & Forming
Custom expansion loop and bellows fabrication.
Weld Procedure Support
Filler metal guidance for field installation.
Certified Testing
Ti/C ratio and mechanical certification per heat.
Logistics
30% T/T Deposit / L/C at sight. Packed in wooden crates with moisture-resistant lining for air or sea freight to project sites.
Standards
ASME SA312
AMS 5570 (Aerospace)
ISO 9001
Frequently Asked Questions
Why is titanium added to TP321?
Titanium combines with carbon preferentially, preventing chromium carbide precipitation at grain boundaries during welding or prolonged exposure between 450°C and 900°C.
Does TP321 need post-weld heat treatment?
Generally no — the stabilization is designed specifically to avoid the need for PWHT in most service conditions.
What is polythionic acid stress corrosion cracking?
It is a cracking mechanism that attacks sensitized stainless steel exposed to sulfur compounds and moisture, typically during refinery shutdown; TP321's stabilization provides meaningful resistance.
How does TP321 compare to TP347?
Both are stabilized grades; TP321 uses titanium while TP347 uses niobium, which generally gives slightly better high-temperature creep strength at the upper end of the service range.
What is the maximum recommended service temperature?
TP321 performs well up to approximately 800°C for continuous service, beyond which TP347 or a nickel alloy may be preferred.
Can TP321 be used for aircraft exhaust systems?
Yes, it is a long-established choice for exhaust collector rings and manifolds where thermal cycling and weldability are both critical.
Ready to Order TP321 Titanium Stabilized Pipe?
Contact us with your service temperature and welding method for a suitable wall thickness recommendation.
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