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,etc. |
| Equivalent Standards |
EN 10216-5, JIS G3459, ISO 1127 |
| Outer Diameter (OD) | 6mm–610mm, customizable |
| Wall Thickness (WT) | 0.5mm-50mm, customizable |
| Length | 6/12 m, or customized |
| Surface Treatment | Pickled |
| Production Process | Hot finished / cold drawn |
| Condition | Solution annealed & pickled |
TP321 is a Ni-Cr-Ti type austenitic stainless steel, primarily utilized in the fabrication of corrosion-resistant industrial equipment operating in high-temperature environments ranging from 500°C to 800°C. It retains excellent corrosion resistance without the need for post-weld solution treatment.
Compared to 304 stainless steel, A312 TP321 seamless stainless steel tubing demonstrates significantly superior resistance to intergranular corrosion within the sensitization temperature range (425°C to 815°C).
TP321 is capable of withstanding the corrosive attack of oxidizing media commonly encountered in the petrochemical industry-such as nitric acid, phosphoric acid, and acetic acid-thereby meeting the diverse requirements for transporting various corrosive media within petrochemical operations.
Customized Services
- In addition to standard dimensions ranging from 6 mm to 610 mm in outer diameter and 0.5 mm to 50 mm in wall thickness, TORICH offers customized sizing specifications to meet specific piping requirements.
- CNC Bending Services: Bending radii of ≥ 3 times the outer diameter are supported, with precise angle control (ranging from 0° to 180°, with a tolerance of ≤ ±1°).
- Precision Cutting Services: Tolerances are maintained at ≤ ±0.5 mm. The cut ends are flat, burr-free, and free of obliquity (perpendicularity ≤ 0.1 mm/m), allowing for direct use in welding without the need for additional grinding.
- Custom Threading Services: We support the machining of custom pipe threads-including international standards such as NPT and BSP-with precision that complies with ASME B1.1 standards.
Chemical Composition
| Element | C | Mn | Si | P | S | Cr | Ni | Ti |
| TP321 (%) | ≤ 0.08 | ≤ 2.00 | ≤ 0.75 | ≤ 0.045 | ≤ 0.030 | 17.0 – 19.0 | 9.0 – 12.0 | ≥ 5 × C (typically 0.5 – 0.7%) |
Mechanical Properties
| Property | Tensile Strength | Yield Strength | Elongation | Hardness (HRB) |
| Value | ≥ 515 MPa | ≥ 205 MPa | ≥ 35% | ≤ 90 |
Possible Alternative Grades
- For applications within the petrochemical industry involving ambient temperatures, low pressures, and no welding requirements, TP304 is a suitable choice; it offers corrosion resistance comparable to that of TP321 while being more cost-effective.
- For high-temperature environments exceeding 600°C-such as piping in cracking furnaces or superheaters-TP321H is recommended, as it exhibits superior high-temperature creep strength.
- For applications involving seawater cooling lines, pipelines transporting chlorine-containing chemical feedstocks, or offshore oil platforms, TP316 is the preferred choice due to its enhanced resistance to chloride corrosion, pitting, and crevice corrosion.
applications Areas
- Refining Equipment: Used for internal components of crude oil distillation columns, as well as shells and tube bundles of high-temperature heat exchangers, to prevent intergranular corrosion caused by process media (such as crude oil or acidic gases) following welding.
- Chemical Reactors: Applied in high-temperature oxidation reactors and high-temperature piping within ammonia synthesis plants; capable of withstanding reaction temperatures ranging from 300°C to 700°C and corrosive gases (such as ammonia and carbon dioxide).
- Acid and Alkali Processing: Used for the welded joints of storage tanks and pipelines handling media such as dilute sulfuric acid and nitric acid; particularly suitable for applications involving heating requirements.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Is it suitable for high-temperature and high-pressure conditions in the petrochemical industry?
A: TP321 is capable of handling conditions involving pressures up to 30 MPa and temperatures up to 900°C, fully meeting the high-temperature and high-pressure requirements of core petrochemical units, such as catalytic cracking and hydroprocessing facilities.
Q: Compared to TP316, which material is better suited for petrochemical environments involving chlorine-containing media?
A: TP316 is the more suitable choice, as its molybdenum content-ranging from 2.00% to 3.00%-significantly enhances the stainless steel's resistance to pitting and crevice corrosion in chlorine-rich environments.
Q: What surface treatment options are available?
A: The tubing is typically supplied with a pickled and passivated surface finish; however, for applications with stringent cleanliness requirements, surface finishes such as bright annealing and electropolishing are also available.
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