ASTM A249 TP321 Stainless Steel Welded Tube For Pressure Tank
GNEE is one of the leading suppliers of 321 stainless steel welded pipes, manufactured using high-quality standard raw materials. We offer premium ASTM A249 TP321 stainless steel welded pipes designed specifically for pressure vessel applications.
These pipes are made from Type 321 stainless steel using Gas Tungsten Arc Welding (GTAW) or Plasma Welding (PAW) processes, followed by solution annealing and acid pickling treatment, resulting in a stable austenitic microstructure. They can withstand continuous exposure to temperatures up to 900°C while maintaining excellent mechanical properties. The high-temperature performance of ASTM A249 TP321 welded pipe is also superior to that of SS 304.
ASTM A249 TP321 round pipes cover common industrial dimensions (outer diameter 6–76 mm, wall thickness 0.5–4 mm) as well as customized specifications. The surface is bright and free from oxidation residues, with low internal surface roughness. Each pipe is tested through hydrostatic testing (≥20 MPa), eddy current inspection (ET), and intergranular corrosion testing (ASTM G28) to ensure reliability.
ASTM A249 TP321 Stainless Steel Welded Heat Exchanger Tube Specification:
| Standards | Welded Tube |
| ASTM | A 249 |
| ASME | SA 249 |
| Product Name | ASTM A249 TP 321 Stainless Steel Welded Tubes |
| Range | 6NB to 1200NB - SCH. 5, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, XXS. |
| In Form of | Round, Square, Rectangle, Oval, Coil, Flexible Pipe, Shaft, 'U' Shape, Hydraulic pipe, Honed Tubes |
| In Length of | Standard & Cut length |
| Special Pipes | Fabricated Pipe (with radiography) |
| Value Added Service | Draw & Expansion as per required Size & Length Polish (Electro & Commercial) Heat Treatment Bending Annealed & Pickled Sand Blasting Machining Etc. |
| Specialize | Fabricated Pipe Square & Rectangle & Other Odd Size |
| Specification: | ASTM A 269/A 213/ASME SA 213 / EN 10216-5/EN 10305 / NACE MR0175/PED 97/23 EC |
| Maximum service temperature: | 650°C / 1205°F |
ASTM A249 TP321 Stainless Steel Welded Heat Exchanger Tube Chemical Composition:
| SA 249 | C | SI | MN | P | S | CR | NI | TI | N |
|---|---|---|---|---|---|---|---|---|---|
| TP321 | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 17.0/19.0 | 9.0/12.0 | 5 X C Min – 0.70 Max | 0.10 |
ASTM A249 TP321 Stainless Steel Welded Tube Mechanical Properties:
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 321 | 515 | 205 | 40% | 95 | 217 |
Physical Properties:
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Co-eff of Thermal Expansion (µm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C (J/kg.K) | Elec Resistivity (nΩ.m) | |||
| 0-100°C | 0-315°C | 0-538°C | At 100°C | At 500°C | |||||
| 321 | 8027 | 193 | 16.6 | 17.2 | 18.6 | 16.1 | 22.2 | 500 | 720 |
ASTM A249 TP321 Stainless Steel Welded Pipe Applications
Boiler and Pressure Vessel Industry: Used in the manufacture of boiler superheater, reheater, economizer, and evaporator tubes; and heat exchange tube bundles in various pressure vessels.
Petrochemical Industry: Used in refinery heat exchangers, condensers, and piping systems; and process piping for handling corrosive media.
GNEE also provides third-party inspection reports and value-added services such as custom cutting and polishing, ensuring safety, durability, and long-term performance in pressure vessel applications.
GNEE provides manufacturer's test certificates (TCs) in accordance with EN 10204/3.1B, raw material certificates, 100% radiographic inspection reports, and third-party inspection reports. We also offer certificates for standards such as EN 10204 3.1 and additional requirements such as NACE MR 01075. Upon request, we can also provide austenite content testing in accordance with the standard.
• EN 10204/3.1B
• Raw material certificates
• 100% radiographic inspection reports
• Third-party inspection reports, etc.
Packaging and Marking:
Packaged in bales or laminated wooden crates, wrapped in plastic, and appropriately protected to ensure seaworthiness for transport, or as required.
Marking must comply with Specification A1016/A1016M. Marking must include information on whether the pipe is hot-finished or cold-finished, including but not limited to: standard, grade, size, heat number, and batch number.
