ASTM A312 TP321 stainless steel pipe is a titanium-stabilized austenitic stainless steel designed for seamless piping. It offers excellent high-temperature strength, resistance to intergranular corrosion, and good weldability. The addition of titanium prevents the formation of chromium carbides within the carbide precipitation range (425 to 850°C), making it well-suited for high-temperature applications such as those in the aerospace, chemical processing, and petroleum refining industries.
ASTM A312 TP321 pickled annealed pipe is a post-production surface treatment involving heating (annealing) followed by immersion in an acidic solution (pickling) to remove the oxide scale and restore corrosion resistance. This treatment results in a uniform matte gray surface and excellent corrosion resistance, making it suitable for various industries, including petrochemical, oil and gas, power generation, and chemical processing.
ASTM A312 TP321 pickled annealed pipe Specifications
| Attribute | Value |
|---|---|
| Available Grades | TP321, TP321H, TP317L, TP310S, TP347H, TP304, TP304H, TP304L, TP316, TP316L, S31803, 2205, 2507 |
| Size Range | OD: 1/4" - 24" | WT: Sch5s - XXS | Length: Max. 6M |
| Manufacturing Method | Seamless (Cold-Drawn) |
| Surface Treatment | Annealed & Pickled |
| Length Options | Standard 6m / Customized available |
| Certification | ISO, PED certified |
ASTM A312 Stainless Steel Seamless Pipe Chemical Composition
| SS GRADE |
UNS. |
ASTM A312/SA 312 CHEMICAL COMPOSITION % MAXIMUM | |||||||
|---|---|---|---|---|---|---|---|---|---|
| C | MN | P | S | SI | CR | NI | Ti | ||
| TP321 | S32100 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 | 9.0-12.0 |
5 × (C+N) min, 0.70 max |
| TP321H | S32109 | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 | 9.0-12.0 |
4(C+N) min; 0.70 max |
ASTM A312 TP321/TP321H Stainless Steel Seamless Pipe Mechanical Properties
| SS GRADE | HEAT TREATMENT | Tensile Strength, min ksi [MPa] | Yield Strength, min ksi [MPa] | |
|---|---|---|---|---|
| Cold Finished | Hot Finished | |||
| TP321 |
2000 °F [1100 °C] |
1925 °F [1050 °C] |
75 [515] | 30 [205] |
| TP321H | 2000 °F [1100 °C] | 1925 °F [1050 °C] | 75 [515] | 30 [205] |
ASTM A312 TP321 Stainless Steel Seamless Pipe Application
Oil and Gas industry: ASTM A312 TP 321 stainless steel seamless pipes are becoming an ideal choice for oil and gas transmission pipelines, refinery process pipelines, and offshore platforms.
Chemical industry: TP321 stainless steel pickled pipes are widely used in the manufacturing of chemical equipment, pipeline systems, and storage tanks to meet high requirements for corrosion resistance.
Nuclear energy field: TP321 stainless steel annealed pipe has become one of the key materials used in the primary and secondary systems of nuclear power plants.
Aerospace: TP321 stainless steel seamless pipes are used to manufacture key components such as aircraft engine parts, fuel systems, and heat exchangers.
Food processing: Due to its smooth inner surface, non-toxic and harmless properties, and easy cleaning, it has become the preferred material for food processing equipment, pipelines, and containers.
GNEE stocks 2,000 tons of ASTM A312 TP321 seamless pipe, including a full range of TP321 thick-wall pipe. Standard sizes are available for shipment within two weeks. Bulk raw material procurement reduces costs. Furthermore, our ISO+PED-compliant, 100% factory-tested, and photo-documented products help distributors shorten procurement cycles and minimize inspection risks.
Packaging and Marking:
Packaged in bales or laminated wooden crates, wrapped in plastic, and with appropriate protective measures to ensure seaworthiness for transport, or as required.
