ASTM A213 TP321 Stainless Steel Seamless Boiler Tubes
Grade: TP321
Process: Seamless (Cold Drawn or Hot Finished)
Main Applications: Boilers, Superheaters, Heat Exchangers,Condensers
Surface Finish: Solution Annealed and Pickled / Bright Annealed
Outer Diameter:6~630mm
Wall Thickness:1~40mm
Length:Random Length or Fixed length
Test:Hydraulic Test/NDT
Delivery Time:Stock 7 Days; MTO 30 Days
Transport Package:Packed in Bundles or Plywooden Box
HS Code:7304419000
ASTM A213 TP321 Tube Manufacturer
GNEE maintains a large ready stock of TP321 stainless steel pipes and strictly manufactures them in accordance with ASTM A213 standards, enabling fast bulk delivery for power generation, petrochemical, and energy heating projects that require highly safe, heat-resistant, and corrosion-resistant seamless boiler pipe solutions.
The ASTM A213 TP321 stainless steel seamless pipes we supply contain titanium at more than five times the carbon and nitrogen content [Ti ≥ 5 × (C + N)] without exceeding specification limits. During welding or service within the 400°C–800°C temperature range, the material effectively resists intergranular corrosion. Through precise annealing processes, the hardness is strictly controlled below the standard maximum limit (≤90 HRB), effectively preventing processing cracks and springback while ensuring leak-free sealing performance. The pipes can continuously operate in high-temperature environments up to 850°C for long-term service.
The inner wall of ASTM A213 TP321 boiler tubes comes into direct contact with media such as high-pressure steam. If the inner surface is rough or contains residues, scale buildup or pitting corrosion can easily occur, reducing heat exchange efficiency and causing corrosion failure. Our SS 321 stainless steel pipes undergo thorough pickling or bright annealing treatment, resulting in smooth internal surfaces free from oxide scale, grease, scratches, or pits. In addition, TP321 stainless steel U tubes are available, with support for customized fixed lengths, end cutting, and bevel processing.
ASTM A213 TP321 Tube for Superheater
Each pipe undergoes eddy current testing, ultrasonic non-destructive inspection, and 100% hydrostatic pressure testing. The finished product qualification rate reaches as high as 99.8%. EN 10204 3.2 material certificates and SGS inspection reports can also be provided.
Click to Get the 321 Pipe Material list
ASTM A213 TP321 stainless steel boiler tubes Applications
ASTM A213 TP 321 seamless tubes are made from stainless steel billets. After cold drawing and cold rolling, they are heat treated at a specific temperature. The finished seamless tubes are primarily used in boilers, heat exchangers, and superheater systems.
specification
Chemical Composition Of ASTM A213 TP321
| Chemical Composition | C | Mn | S | P | Cr | Ni | Si |
| 0.08 | 2.00 | 0.03 | 0.045 | 17.00-19.00 | 9.00-12.00 | 1.00 |
Mechanical Property Of ASTM A213 TP321
| Steel Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) |
| ASME SA213 TP321 | 205 | 515 | 35 |
ASTM A213 Stainless Steel Tubes Outside Diameter and Wall Thickness Tolerance
| OD, mm | OD Tolerance |
| < 25.4 under | +/- 0.10 |
| 25.4 to 38.1 | +/- 0.15 |
| 38.1 to 50.8 | +/- 0.20 |
| 50.8 to 63.5 | +/- 0.25 |
| 63.5 to 76.2 | +/- 0.30 |
| 76.2 to 101.6 | +/- 0.38 |
| 101.6 to 190.5 | +0.38/-0.64 |
| 190.5 to 228.6 | +0.38/-1.14 |
| 228.6 over | +/-1% |
TP321 vs. TP347 Boiler Tubes: Which Is Better?
Both are stabilized steel grades. TP321 is stabilized with titanium and offers a more cost-effective price point, whereas TP347 is stabilized with niobium (Nb). While TP347 exhibits slightly superior stability compared to TP321 under extremely high temperatures and in certain strongly oxidizing environments, TP321 represents the most cost-effective choice for the majority of boiler applications.
What is the maximum temperature tolerance of TP321 boiler tubes?
In terms of oxidation resistance, they can withstand intermittent temperatures of up to 815°C. In pressure-bearing applications, TP321 is commonly used for superheater and reheater tubing operating within the temperature range of 400°C to 750°C.
ASTM A213 Testing Requirement
Each tube shall be subjected to the nondestructive electric test or hydrostatic test, Manufacturer Material Test Certification as per EN 10204 3.1 should be provided.
Tensile property, Elogation
Hardness testing, Brinell, Rockwell, Vickers hardness
Flattening testing
Flaring testing
Hydrostatic or Nondestructive test
Intergranular Corrosion Test - ASTM A262/E (option)
TP321 stainless steel bright annealed tube Manufacturer
Leveraging years of export experience, our products have been shipped to over 50 countries and regions worldwide. Supported by comprehensive technical documentation, we are dedicated to assisting our global clients in effectively enhancing equipment safety, extending service life, and significantly reducing maintenance and replacement costs throughout the long-term operation of their facilities.
high quality packaging
A213 seamless steel pipes are individually packaged in separate plastic sleeves, wrapped externally with waterproof material, and secured with nylon ropes. The exterior of the packaging features clear labeling to facilitate the quick identification of quantities and product numbers. Delivery Lead Time: Typically 10 to 25 days; however, if sufficient stock is available, we will arrange for shipment as soon as possible.
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