Product Overview – ASTM A213 TP321 Seamless Tubes
ASTM A213 TP321H seamless tubes are high-temperature stainless steel tubes developed for applications where strength and stability must be maintained under continuous heat exposure.
The “H” grade contains higher carbon content, which enhances creep resistance and high-temperature mechanical strength compared with standard TP321 tubes.
The addition of titanium stabilizes the material, preventing chromium carbide precipitation during welding and prolonged heat exposure.
TP321H seamless tubes are manufactured through advanced cold-drawing or hot-finished processes to deliver excellent dimensional accuracy, smooth surface finish, and high pressure resistance.
Because of these properties, ASTM A213 TP321H tubes are widely used in boiler systems, refinery process units, superheater tubes, furnace components, and petrochemical heat exchangers operating under high temperature conditions
Standard & International Identification - ASTM A213 TP321H Seamless Tubes
Technical Specifications – TP321H Seamless Tubes
| Tube Type: | Seamless Stainless Steel Tubes |
| Manufacturing Process: | Cold Drawn / Hot Finished |
| Outer Diameter: | 6 mm to 273 mm |
| Wall Thickness: | 1 mm to 30 mm |
| Length Options: | Random / Cut Length / U-Bend Tubes |
| Surface Finish: | Bright Annealed / Pickled & Annealed |
| Testing Standards: | Hydrostatic Test, Eddy Current Test,Ultrasonic Testing, PMI |
| Certification : | EN 10204 3.1 / 3.2 MTC |
Third Party Inspection Available
All specifications are in accordance of ASTM A213 / ASME SA213 standards. Mechanical and chemical values are as per standard limits. Mill Test Certificates (MTC) available upon request.
Chemical Composition – Stainless Steel TP321H
(As per ASTM specification)
| Element | Max (%) |
|---|---|
| Carbon (C): | 0.04 – 0.10% |
| Manganese (Mn): | 2.00 % |
| Silicon (Si): | 1.00% |
| Phosphorus (P): | 0.045 % |
| Sulfur (S): | 0.030 % |
| Chromium (Cr): | 17.0-19.0% |
| Nickel (Ni): | 9.0-12.0% |
| Titanium (Ti): | 5 × Carbon minimum to 0.70% |
| Iron : | Balance |
Note: Higher carbon content increases creep strength for high-temperature pressure systems.
Mechanical Properties – ASTM A213 TP321H Tubes
| Property | Minimum Value |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength | 205 MPa |
| Elongation | 35% |
These mechanical properties ensure excellent durability in high pressure and high temperature industrial equipment.
High Temperature Strength of SS 321H Tubes
SS 321H tubes are specifically engineered for environments where prolonged heat exposure is common.
Key thermal advantages include:
Because of these characteristics, TP321H tubes are commonly used in superheater and reheater applications in power plants.
Major Industrial Applications of TP321H Seamless Tubes
- ASTM A213 TP321H seamless stainless steel tubes are widely used in:
- 🔸Boiler and Superheater Tubes
- 🔸Petrochemical Refinery Units
- 🔸High Temperature Furnace Equipment
- 🔸Power Plant Heat Exchangers
- 🔸Chemical Processing Systems
- 🔸Industrial Heat Treatment Plants
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