Products Description
Product Specifications
| Standards |
ASTM A312/ASME SA312 |
| Steel Grades | TP XM-19 TP XM-10 TP XM-11 TP XM-15 TPXM-29 304 304L 304H 304LN 309S 309H 310S 316 316L 316LN 317 321 347 347H 348 904L |
| Equivalent Standards | EN 10216-5,JIS G3459 |
| Outer Diameter (OD) | 6 mm – 610 mm |
| Wall Thickness (WT) | 0.5 mm – 60 mm |
| Length | 6/12m, or customizable |
| Surface Treatment | Pickled, Bright Annealed |
| Production Process | Hot extrusion, cold drawing, cold rolling |
| Condition | Solution Annealed |
The titanium element added to SA312 TP321 321H stainless steel pipe effectively inhibits the precipitation of chromium carbides at grain boundaries, thereby fundamentally preventing the occurrence of intergranular corrosion. These pipes are suitable for high-temperature boiler applications and can operate within the temperature range of 425–815°C without undergoing sensitization.
TP321/TP321H stainless steel pipes can be joined using various welding methods, including TIG, MIG, and arc welding.The chromium and nickel elements present in TP321/TP321H form a dense passivation film on the pipe surface, which effectively resists corrosion from acidic media found in boiler feedwater, steam, and flue gases.
Customized Services
- TORICH offers custom manufacturing services for thin-walled tubes (0.5 mm to 3 mm) and thick-walled tubes (10 mm to 60 mm), as well as cut-to-length services.
- Upon customer request, we provide various surface treatments, including pickling and passivation, bright annealing, mechanical polishing (240, 320, 400, and 600 grit), shot blasting, and sandblasting.
- We also support processing services such as U-bending, coiling, and diameter expansion/reduction.
Chemical Composition
| Element | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | Ni (%) | Ti (%) | N (%) | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| TP321 | ≤ 0.08 | ≤ 2.00 | ≤ 0.75 | ≤0.045 | ≤ 0.030 | 17.0 – 19.0 | 9.0 – 12.0 | ≤ 5 × (C+N) min to 0.70 | ≤ 0.10 | Balance |
| TP321H | 0.04 – 0.10 | ≤ 2.00 | ≤ 0.75 | ≤0.045 | ≤0.030 | 17.0 – 19.0 | 9.0 – 12.0 | ≤ 5 × (C+N) min to 0.70 | ≤ 0.10 | Balance |
Mechanical Properties
| Property | Tensile Strength | Yield Strength | Elongation | Hardness | Applicable Temperature Range | Heat Resistance |
|---|---|---|---|---|---|---|
| TP321 | 515 MPa min (75 ksi) | 205 MPa min (30 ksi) | 35% min | 95 HRB max | Up to approx. 870°C | Excellent |
| TP321H | 515 MPa min (75 ksi) | 205 MPa min (30 ksi) | 35% min | 95 HRB max | Up to approx. 900°C | Superior for prolonged high-temperature service |
Possible Alternative Grades
- The high-temperature creep performance of TP347 / TP347H is comparable to that of TP321H, allowing for long-term service temperatures of up to 900°C; these grades are utilized in power generation boilers where temperatures are extremely high.
- For applications involving oxidizing atmospheres-such as furnace tubes and heaters-TP310S is a suitable choice, offering exceptional oxidation resistance at temperatures below 1100°C.
- For sections within power generation boilers where the medium contains high concentrations of chloride ions and is highly corrosive, TP316 / TP316H may be selected.
application areas
Specific Applications of ASTM A312 TP321/TP321H Seamless Tubes in Power Generation Boilers:
- Boiler Superheater Tubes
- Reheater Tubes
- Main Steam Piping Systems
- Heat Recovery Steam Generator (HRSG) Tubes
- Boiler Headers and Connecting Piping
- Furnace Outlet and Hot Gas Transport Piping
- Steam Coil Heat Exchangers
- Auxiliary Boiler Systems
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What equivalent standard materials can you provide?
A: The international equivalent standards corresponding to ASTM A312 TP321/TP321H include: EN 10216-5 (X6CrNiTi18-10 / X7CrNiTi18-10, W.Nr. 1.4541) and JIS G3459 (SUS321 / SUS321H).
Q: Can you produce pipes in non-standard dimensions?
A: Yes. We offer customization services for non-standard outer diameters, wall thicknesses, and lengths, covering a full size range of 6.0–610 mm in outer diameter and 0.5–60 mm in wall thickness. We also provide processing services such as U-bending and finning.
Q: What maximum temperature can TP321H withstand?
A: TP321H offers oxidation resistance at temperatures of up to approximately 900°C under intermittent service conditions.
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