If you are looking for durable stainless steel seamless pipes for high-temperature and intergranular corrosion-resistant environments, we offer ASTM A312 TP321 Stainless Steel Pipes, specifically designed for heat exchangers, boilers, chemical equipment, and high-temperature industrial piping systems.
Our ASTM A312 TP321 stainless steel pipes are manufactured from hot-extruded steel billets, resulting in seamless tubes without joints or welds, offering excellent load-bearing capacity under various environmental conditions. These pipes are typically annealed at approximately 1605°F (875°C) and then water-quenched to prevent carbide precipitation during welding or exposure to high temperatures (450-850°C), effectively preventing intergranular corrosion. TP321 stainless steel high-temperature pipes are suitable for continuous use at extreme temperatures ranging from 538°C to 870°C. They have a minimum tensile strength of 515 MPa and a minimum yield strength of 205 MPa.
Our ASTM A312 TP321 seamless pipes are manufactured strictly according to ASTM standards, featuring uniform wall thickness and a smooth surface. Diameters can be customized from 6mm to 500mm, and lengths can be cut to project requirements.
ASTM A312 TP321 seamless pipes
ASTM A312 TP321 Stainless Pipe for High-Temperature Service
Stainless Steel 321 Pipe Specification
| Standard Specification | ASTM A 312/ ASME SA 312/ EN10216-5 |
| Size | ½ to 6 Inch NB |
| Wall Thickness | 0.1 To 60 mm |
| Manufacturing Technology | Hot / Cold Formed |
| Standard | DIN, JIS, AMS, GB, AISI, ASME, ASTM, EN, GOST |
| Technique | Cold Rolled Hot Rolled |
| Surface Finish | Bright, Cold Finish, Annealing, Polished, Pickling |
| Schedule Pipe Thickness Range | SCH 80, SCH 40, SCH XXS, SCH 5, SCH 80S, SCH10, SCH XS, SCH 160 |
| Manufacturing Shapes | Round, Rectangle, Square, Box Section |
| Types | Seamless, ERW, Welded, EFW |
ASTM A312 TP321 UNS 32100 Stainless Steel Seamless Pipe
| UNS Designation | C | Mn | P | S | Si | N | Cr | Mo |
| S32100 | 0.08 | 2 | 0.045 | 0.03 | 1 | 17.0–19.0 | 9.0–12.0 | ... |
Outside diameter and Tolerance
| Hot rolled | Outside Diameter, mm | Tolerance |
| 30≤OD≤219.1 | D2, ±1% or ±0.5mm | |
| 219.1＜OD≤610 | D1, ±1.5% or ±0.75mm | |
| Cold Drawn | Outside Diameter, mm | Tolerance |
| OD≤219.1 | D3, ±0.75% or ±0.3mm | |
| OD≤219.1 | D4, ±0.5% or ±0.1mm |
ASTM A312 TP321 Seamless Pipe Mechanical Properties
| Density | 8.027 g/cm3 |
| Melting Point | 1454 °C (2650 °F) |
| Tensile Strength(min) | 515 MPa (75 ksi) |
| Yield Strength (min) | 205 MPa (30 ksi |
| Elongation(min) | 35% (in 50 mm) |
ASTM A312 TP321 Pipe Comparison with Other Grades
| Grade | Key Differences from TP321 | Typical Use Cases |
| TP304 | Lower cost, no titanium stabilization; prone to sensitization | Low-temperature corrosive environments |
| TP316 | Molybdenum addition for better pitting resistance | Marine and chloride-rich environments |
| TP321H | Higher carbon content (0.04–0.10%) for improved high-temperature strength | High-temperature pressure vessels and boilers |
GNEE has nearly 18 years of experience in seamless stainless steel tube production. Every tube undergoes dimensional, surface, PMI, eddy current, or hydrostatic tests. Only high-quality tubes are packaged and delivered to customers worldwide. Our tubing offering covers both imperial and metric sizes, with outer diameters ranging from 1.58 mm to 108 mm. Special sizes are also available upon request.
| Product | Payment Terms | Shipping Method | Delivery Time | Notes / Packaging |
|---|---|---|---|---|
| ASTM A312 TP321 Stainless Steel Pipe (High-Temperature Service) | - T/T 30% advance, 70% before shipment - L/C at sight |
- Sea freight (FCL / LCL) - Air freight (for urgent small orders) - CIF / FOB / DDP optional |
- 15–30 days for standard sizes and quantities - Customized orders may take longer |
- Pipes packed in wooden crates or steel bundles, protected with anti-rust oil and wrapping - Inspected for dimensions, straightness, and surface finish - Optional third-party inspection available |
ASTM A312 TP321 Seamless Pipe Packaging
TP321 Seamless round pipes shipped to South Korea