ASTM A213 TP312H stainless steel for heat exchanger tubes
ASTM A213 TP312H stainless steel for heat exchanger tubes
ASTM A213 TP312H is a seamless, austenitic stainless steel grade suitable for high-temperature applications such as heat exchangers, boilers, and superheaters. The "H" in TP312H indicates a higher creep rupture strength than similar grades without the "H," making it suitable for severe service conditions. Key features include excellent resistance to high temperatures, corrosion, and oxidation, high durability, and amenity for quality and reliability testing.
What's the best stainless steel for heat exchangers?
321 Alloy Stainless Steel
321 Alloy is an extremely heat-resistant stainless steel, with a maximum temperature resistance of 870°C, making it ideal for use in heat exchangers. It also offers good thermal conductivity.
Chemical Composition of TP321H (UNS S32109) tubes
| 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) tubes
| 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) tubes
| 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 Seamless Stainless Steel Tube - Application Benefits
1. Excellent Corrosion Resistance for Harsh Environments
High alloy content provides excellent resistance to pitting and crevice corrosion
PREN ≥ 40 ensures reliable performance in chloride-containing media
2. Excellent Heat Transfer Efficiency
Bright annealed surface minimizes scaling and maintains optimal heat transfer coefficient
Seamless construction with uniform wall thickness ensures stable thermal performance
3. High-Temperature Resistance
Maximum operating temperature of 1100°C, suitable for a variety of heat exchanger applications
Maintains mechanical properties under thermal cycling conditions
4. Long Service Life and Reliability
Excellent oxidation resistance reduces maintenance and downtime
Reliable performance in chemical processing and power generation applications
5. Easy Maintenance and Cleaning
Smooth BA surface prevents scale accumulation and allows for easy cleaning. Contamination-free surface ensures product purity in pharmaceutical and food applications
6. Cost-effective solution. Extended service life reduces replacement frequency and total cost of ownership. Reduced fouling maintains heat transfer efficiency, 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
