ASTM A213 TP321H Stainless Steel Bright Annealed Tubes for Heat Exchangers
ASTM A213 TP321H Stainless Steel Bright Annealed Tubes for Heat Exchangers
ASTM A213 TP321H stainless steel tubing is seamless, bright-annealed tubing used in heat exchangers. Due to the addition of titanium, it exhibits excellent corrosion resistance and high-temperature strength. The bright annealing process provides excellent surface finish and prevents oxidation; the "H" rating indicates a higher carbon content, thus enhancing high-temperature strength. These tubing materials are suitable for temperatures up to approximately 900°C and maintain good resistance to intergranular corrosion even after prolonged exposure to high temperatures.
What is SA 213 TP 321 material?
321 austenitic stainless steel
SA213 TP321 is a heat exchanger tube specification made of 321 austenitic stainless steel. The SA 213 specification defines different grades of heat exchanger tubes, including ferritic and austenitic stainless steels.
Chemical Composition of TP321H Tubes(UNS S32109)
| Element | Requirement (%) | Notes |
| Carbon (C) | 0.04–0.10 | Controlled carbon range for high-temperature stability |
| Manganese (Mn) | 2.00 max | |
| Phosphorus (P) | 0.045 max | |
| Sulfur (S) | 0.030 max | |
| Silicon (Si) | 1.00 max | |
| Chromium (Cr) | 17.0–19.0 | Provides oxidation resistance |
| Nickel (Ni) | 9.0–12.0 | Austenite stabilizer |
| Titanium (Ti) | 4(C+N)–0.70 min | Stabilization against sensitization |
Heat Treatment Specifications for TP321H Tubes(UNS S32109)
| Parameter | Requirement | Notes |
| Grade | TP321H | Titanium-stabilized austenitic stainless steel |
| UNS Number | S32109 | |
| Heat Treat Type | Solution treatment | |
| Solution Treating Temperature | 2000°F [1090°C] | Higher than standard TP321 (1900°F/1040°C) |
| Cooling Media | Water or other rapid cooling | Prevents carbide precipitation |
Mechanical Properties of TP321H Tubes(UNS S32109)
| Property | Requirement | Notes |
| Grade | TP321H | Titanium-stabilized austenitic stainless steel |
| UNS Designation | S32109 | |
| Tensile Strength, min | 75 ksi [515 MPa] | Matches standard TP321 requirements |
| Yield Strength, min | 30 ksi [205 MPa] | 0.2% offset method |
| Elongation in 2 in. or 50 mm, min | 35% | Standard elongation for austenitic grades |
| Hardness, max | 192 HBW/200 HV | Brinell/Vickers hardness |
| Hardness, max | 90 HRB | Rockwell B scale |
Heat Treatment
Annealing: Bright annealing is performed in a controlled, non-oxidizing atmosphere (e.g., hydrogen or an inert gas). This prevents surface oxidation, maintains the metal's natural luster, and achieves excellent surface finish.
Solution Annealing: The tubing is solution annealed at 1900°F to 1950°F (1040°C to 1065°C) and then water-quenched.
Stabilization Treatment: After manufacturing, a stabilization heat treatment at 1650°F (900°C) for 2–4 hours may be required. This removes carbon from the solid solution and prevents the formation of chromium carbide at high temperatures.
Why Choose Gnee Steel (Supplier Example)?
✅ Large stock of 304/316 stainless steel strip/coil, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), Chemical Composition Certificate, and Mechanical Properties Certificate.
✅ Value-added services: Slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documentation.
Email: ru@gneesteelgroup.com
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
