Product Overview – ASTM A312 TP321H Welded Pipes
ASTM A312 TP321H is the high carbon version of 321 stainless steel. The higher carbon content increases high-temperature strength while titanium stabilization prevents carbide precipitation.
TP321H welded pipes are produced using precision ERW welding methods and are solution annealed and tested according to ASTM A312 specifications.
This grade is commonly specified for boiler components, superheaters, refinery piping systems, and thermal power plants where elevated temperature strength is critical.
Compared to standard 321, TP321H provides better creep resistance and improved performance under sustained heat exposure.
Standard & International Identification - ASTM A312 TP321H Welded Pipes
Technical Specifications – TP321H Welded Pipes
| Manufacturing Method: | Welded / ERW |
| Available Sizes: | 1/8″ NB to 36″ NB |
| Wall Thickness: | SCH 5S to SCH 160 |
| Standard Length: | 6m, 12m, Custom Length |
| Surface Finish: | Pickled, Annealed, Industrial Finish |
| Pipe Ends: | Plain End (PE), Beveled End (BE) |
| Inspection: | Hydrostatic, Weld Seam Testing, PMI |
| Certification : | EN 10204 3.1 / 3.2 MTC |
| Dimensional compliance: | ASME B36.19M. |
All specifications are in accordance of ASTM A312 / ASME SA312 standards. Mechanical and chemical values are as per standard limits. Mill Test Certificates (MTC) available upon request.
Chemical Composition of TP321H Welded Pipes
(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): | 5xC min to 0.70% max |
| Iron : | Balance |
Note: Higher carbon improves high-temperature strength.
Mechanical Properties – TP321H Welded Pipes
| Property | Minimum Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | 35% |
TP321H offers improved creep resistance and strength retention at elevated temperatures.
Heat Resistance & Performance Advantages- ASTM A312 TP321H Welded Pipes
SS 321H welded pipes provide:
For boiler and refinery systems operating under heat stress, TP321H is often preferred over 321.
Major Industrial Applications of TP321H Welded Pipes
- 🔸Thermal power plants
- 🔸Boiler and superheater systems
- 🔸Oil & gas refineries
- 🔸Petrochemical units
- 🔸Pressure vessels
- 🔸High temperature steam lines
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