ASTM A213 TP312H bright annealed stainless steel tubes for heat exchangers
ASTM A213 TP312H bright annealed stainless steel tubes for heat exchangers
ASTM A213 TP312H bright annealed stainless steel tubing is widely used in heat exchangers, boilers, and superheaters due to its seamlessness, corrosion resistance, and excellent high-temperature performance. Key characteristics include: a smooth bright annealed surface, the use of a specific grade of stainless steel (possibly a modified 300 series alloy), and the ability to withstand high pressure and high heat transfer requirements. The "H" indicates a high-carbon version, which significantly improves high-temperature strength.
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 (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 (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 (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 |
ASTM A213 TP312H Stainless Steel Seamless Tube - Application Advantages
1. Excellent Corrosion Resistance, Suitable for Harsh Environments
High alloy content provides superior resistance to pitting and crevice corrosion.
PREN ≥ 40 ensures reliable operation in chloride-containing media.
2. Excellent Heat Transfer Efficiency
Bright annealed surface minimizes scaling and maintains optimal heat transfer coefficient.
Seamless construction ensures uniform wall thickness for consistent thermal performance.
3. High Temperature Resistance
Maximum operating temperature up to 1100°C, suitable for a wide range of heat exchanger applications.
Maintains mechanical properties under thermal cycling conditions.
4. Long Service Life and High Reliability
Excellent oxidation resistance reduces maintenance needs and downtime.
Proven reliable performance in chemical and power generation applications.
5. Easy Maintenance and Cleaning
Smooth BA surface prevents scale buildup and facilitates cleaning.
Contamination-free surface ensures product purity in pharmaceutical and food applications.
6. Cost-effective solutions
Extended service life reduces replacement frequency and total cost of ownership
Reduced fouling maintains heat transfer efficiency, thus saving energy costs
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
