Our confidence in the quality of our stainless steel capillary pipes, seamless pipe, 1.625 dom tubing comes from our continuous technological innovation system, strict quality inspection procedures and proactive customer service. Our company rules the factory by law, emphasizing the seriousness of Zhengtong's standardization construction. The company continues to strengthen internal management, tap its own potential, give full play to its technological advantages, and produce better products. We will always do our best to reach higher goals and each employee will be challenged to achieve the best quality.
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.
We constantly improve the stability of finished High Quality and Low Price 1 Inch ASTM A312 Tp 316L 1.4462 Duplex Stainless Steel Pipe / ... production and the speed and capability of new product development. We abide by and respect the laws and culture of our location, and actively repay society while developing our business. Low cost, high quality, customized products and services are the advantages of our customized production model.
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