Products Description
Product Specifications
| Standards | ASME SA213 / ASTM A213 |
| Steel Grades | TP321(UNS S32100),TP316L(UNS S31603) |
| Equivalent Standards |
EN 10216-5, JIS G3463, DIN 17456, etc |
| Outer Diameter (OD) | 12.7 – 76.2 mm, customized |
| Wall Thickness (WT) | 0.5 – 10 mm, customized |
| Length | According to heat exchanger design |
| Surface Treatment | Annealed & pickled, bright annealed, or customized |
| Production Process | Cold Drawn / Cold Rolled / U Bent |
| Condition | U-bent, annealed |
SA 213 TP321 316L stainless steel U tube is manufactured from high-quality stainless steel grades such as TP321 and TP316L, offering exceptional resistance to intergranular corrosion. They maintain this superior resistance even during prolonged service within the sensitization temperature range of 425–850°C or when used in the as-welded condition without post-weld solution treatment.
These tubes exhibit excellent high-temperature strength. Compared to TP304L/TP316L, TP321 offers superior high-temperature rupture strength and creep properties at temperatures above 500°C, making it particularly suitable for high-temperature heat exchangers, superheaters, and reheaters.
Customized Services
- Customization is available for non-standard outer diameters, wall thicknesses, straight-section lengths, and U-bend radii; we support ultra-small bend radii and extra-long straight or U-shaped tubes, with tolerances strictly controlled within ±0.1mm.
- Surface treatment options include pickling and passivation, bright annealing, electropolishing, mechanical polishing, inner-wall degreasing, and oil-free cleaning.
- Tube-end processing-such as chamfering, beveling, flaring, swaging, and precision end-facing-is supported to accommodate various installation methods, including welding, tube expansion, and threaded connections.
Chemical Composition
| Element | Carbon | Manganese | Silicon | Phosphorus | Sulfur | Chromium | Nickel | Molybdenum | Titanium | Ferrum |
| TP321 | ≤0.08 | ≤2.0 | ≤0.75 | ≤0.045 | ≤0.030 | 17.0–19.0 | 9.0–12.0 | – | 5×C – 0.70 | Balance |
| TP316L | ≤0.035 | ≤2.0 | ≤0.75 | ≤0.045 | ≤0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | – | Balance |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation (%) | Hardness (HB) |
| TP321 | ≥ 515 | ≥ 205 | ≥ 40 | ≤ 217 |
| TP316L | ≥ 485 | ≥ 170 | ≥ 40 | ≤ 217 |
Possible Alternative Grades
- For standard industrial heat exchange applications operating at ambient temperature and temperatures up to 350°C-and in the absence of highly corrosive media-SA213 TP304 may be selected as a substitute; TP304 is more cost-effective, while its fundamental mechanical and heat transfer properties meet standard requirements.
- For higher-temperature applications such as boilers, superheaters, and petrochemical high-temperature heat exchangers, TP347/347H is a suitable choice, offering superior high-temperature strength and resistance to sensitization compared to TP321.
- If the equipment involves high design pressures and high-chloride media, with operating temperatures not exceeding approximately 300°C, duplex stainless steel may be considered as an alternative to TP316L to allow for reduced wall thickness and lower equipment weight.
applications areas
- Oil, Gas & Refining: Crude oil heat exchangers, feed/effluent heat exchangers, refinery process heaters, oil coolers, hydrocarbon condensers
- Chemical Processing: Process fluid heat exchangers, chemical coolers, reboilers, condensers, evaporators
- Power Generation: Feedwater heaters, steam condensers, boiler auxiliary heat exchangers, heat recovery systems, cooling water heat exchangers
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What is the maximum temperature tolerance for TP321 stainless steel U-tubes?
A: In the solution-annealed state, TP321 U-tubes can withstand long-term continuous service temperatures of up to 550°C and short-term peak temperatures of 600°C. Within this range, they maintain stable mechanical and corrosion-resistant properties and are resistant to deformation or failure.
Q: Why is TP316L more suitable for heat exchangers than standard 316?
A: TP316L has a carbon content of ≤0.03%, which is significantly lower than that of standard 316. This effectively prevents intergranular corrosion caused by welding or long-term service and eliminates the need for secondary solution treatment. It is well-suited for high-frequency welding assembly and continuous long-term operation typical of heat exchangers, resulting in a longer service life.
Q: What non-destructive testing and pressure testing services are available?
A: We offer 100% hydrostatic testing, pneumatic testing, eddy current testing, ultrasonic testing, liquid penetrant testing, radiographic testing, and endoscopic inspection. We can combine testing procedures based on specific technical requirements.
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