ASTM A312 TP321 stainless steel annealed seamless pipe
ASTM A312 TP321 pipe is a titanium-stabilized austenitic stainless steel known for its excellent high-temperature strength and resistance to intergranular corrosion, making it an ideal choice for corrosive and high-temperature applications. It exhibits excellent toughness even at cryogenic temperatures, welds well using conventional methods, and can be formed using hot or cold working processes. The seamless properties of this pipe provide exceptional load-bearing capacity and integrity in a variety of industrial applications.
What are the specifications for SS 316 seamless pipe?
316 stainless steel pipe has a minimum tensile strength of 515 MPa and a minimum yield strength of 200 MPa. Its density is as high as 8,000 kg/m³. Standard wall thicknesses for these pipes range from 0.5 mm to 6.35 mm. SS 316 seamless pipe does not have fillet welds.
ASTM A312 TP321 Stainless Steel Bright Annealed Seamless Pipe Chemical Requirements
| Grade | UNS Designation | Carbon | Manganese | Phosphorus | Sulfur | Silicon | Chromium | Nickel | Nitrogen |
| TP321 | S32100 | 0.08 | 2 | 0.045 | 0.03 | 1 | 17.0 - 19.0 | 9.0 - 12.0 | 0.1 |
ASTM A312 TP321 Tensile Requirements
| Grade | UNS Designation | Tensile Strength | Yield, min | ||
| ksi | MPa | ksi | MPa | ||
| TP321 | S32100 | ||||
| Welded | 75 | 515 | 30 | 205 | |
| Seamless | |||||
| t ≤ 0.375 in. [9.50 mm] |
75 | 515 | 30 | 205 | |
| t ＞ 0.375 in. [9.50 mm] |
70 | 485 | 25 | 170 |
Pipe and Filler Metal Specification
| Grade | UNS Designation | Filler Metal (AWS A5.9 Class) | UNS Designation(Filler Metal) |
| TP321 | S32100 | ER321 |
S32180, W32140 |
Annealing Requirements
| Grade | UNS Designation | Heat Treating Temperature | Cooling/Testing Requirements |
| TP321 | S32100 | 1900 °F [1040 °C] | water or other rapid cool |
ASTM A312 TP321 Bright Annealed Seamless Stainless Steel Pipe for the Petroleum Industry
Corrosion Resistance: TP321 contains titanium, which stabilizes its structure and effectively resists intergranular corrosion caused by high temperatures during oil exploration, refining, and transportation. It can withstand the erosion of various oilfield media, including crude oil, natural gas, and produced water.
High-Temperature Performance: In high-temperature sections of the refining process, such as distillation towers and heaters, it maintains excellent mechanical properties, ensuring stable operation at high temperatures without significant deformation or performance degradation.
Bright Annealing Advantages: The bright annealed surface has a smooth surface that reduces the adhesion of impurities in the oil, making it easy to clean and minimizing the risk of scaling corrosion, helping to maintain internal pipe cleanliness and oil flow efficiency.
Seamless Structural Reliability: The seamless design eliminates potential leak points at welds, providing a more reliable pipeline system for transporting high-pressure, high-value oil products, enhancing safety and reducing environmental pollution risks.
Gnee Steel specializes in the production of a wide range of stainless steel products. Gnee Steel's product packaging includes: Steel Strapping: Pipes with an outer diameter of 3 inches or less are typically strapped together with polypropylene film to prevent rust during ocean shipping, and then secured with steel strapping. Wooden Cases/Crates: Pipes are typically packaged in wooden cases or crates to protect the pipes during transportation, especially those that are longer or have larger diameters. Seaworthy Export Packaging: Suppliers typically use standard seaworthy export packaging methods, which may include a variety of materials and techniques to protect the pipes during transportation. Tarpaulin Packaging: This prevents rain, seawater, and other external factors from penetrating the export crates during transportation. Gnee Steel specializes in the production and sale of alloy materials. Gnee Steel's products are widely used in the aerospace, chemical, power, automotive, and nuclear energy sectors, and we can provide customized alloy material solutions based on customer needs. For alloy material pricing or customized alloy material solutions, please contact us for a quote: ru@gneesteelgroup.com
