ASME SA312 TP321H heat exchanger tubes
ASME SA312 TP321H heat exchanger tubes
ASME SA312 TP321H heat exchanger tubes are made from high-carbon austenitic stainless steel stabilized with titanium to resist intergranular corrosion at elevated temperatures. This grade is ideal for high-temperature applications, such as those found in the petrochemical, refining, and power generation industries, where it's used in boiler components, furnaces, and waste heat recovery systems. The "H" designation represents the high carbon content, which improves high-temperature strength; the titanium prevents carbide precipitation, maintaining corrosion resistance at temperatures between 800 and 1500°F (approximately 483 and 753°C).
What is SA312 material?
SA312 material refers to stainless steel pipe manufactured according to the ASME SA312 standard. This standard is widely used for seamless, welded, and cold-finished austenitic stainless steel pipe suitable for general corrosive and high-temperature applications. Key material grades include TP304L (a common and widely used chromium-nickel stainless steel) and TP316L (which has higher corrosion resistance due to its molybdenum content).
Specification of Stainless Steel 321H Pipe
| International Specification | ASTM A312/ ASME SA 312 TP 321H |
| Seamless Pipes Size |
Outer Diameter: 4 to 219mm Wall Thickness: 0.5 to 20mm |
| Welded Pipe Size |
Outer Diameter: 5.0 - 1219.2 mm |
| EFW Pipe Size |
Outer Diameter: 5.0 - 1219.2 mm |
| Wall Thickness | Schedule 5, Schedule 40, Schedule10, Schedule 80, Schedule 160, Schedule 80S, Schedule XXS, Schedule XS |
| techniques | EFW/ Seamless / ERW / Welded / LSAW/ Fabricated / Seam-Welded / CDW/ Redrawn |
| Form | Round, Square, Rectangular |
| Length | Double Random & Required Length End, Single Random, Plain End, Treaded, Beveled End |
| Condition | Hot Finished, Annealed and Pickled, Bright Annealed, Polished, Cold Drawn |
321H Stainless Steel Tube Chemical Element
| Element | SS 321H |
| Nickel | 09 To 12 |
| sulfur | 00.03 Maximum |
| Nitrogen | 00.10 |
| Chromium | 17 To 19 |
| Silicon | 00.75 Maximum |
| Magnesium | 2 Maximum |
| Carbon | 00.04 To 0.08 |
| Phosphorus | 00.045 Maximum |
| Titanium | 00.70 Maximum |
Mechanical Properties of SS 321H Seamless Pipe
| Element | SS 321H |
| Tensile Strength | 515 |
| Yield Strength | 205 |
| Elongation | 40 |
| Rockwell | 95 |
| Brinell | 217 |
Key Features of ASME SA312 TP321H Heat Exchanger Tubes
Material: Austenitic stainless steel (Austenitic stainless steel) with a high carbon content ("H") for improved high-temperature strength.
Stabilization: Contains titanium, which acts as a stabilizer to prevent chromium carbide precipitation at high temperatures, thereby preventing sensitization and intergranular corrosion.
Corrosion Resistance: Provides excellent resistance to oxidation and general corrosion, and is specifically designed to resist intergranular corrosion.
High-Temperature Performance: Provides excellent heat resistance, high-temperature strength, and creep strength, making it suitable for continuous use at high temperatures.
Applications of ASME SA312 TP321H Heat Exchanger Tubes:
Petrochemical and Refining: Used in heat exchangers, catalytic reforming, hydrocracking, and ethylene pyrolysis furnaces.
Power Generation: Used in boiler superheaters, reheaters, economizers, and air preheaters.
Industrial Furnaces: Used in convection sections, radiant tubes, and waste heat recovery units.
Waste Heat Recovery: Used in systems that capture and reuse heat from high-temperature exhaust streams.
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
