ASTM A213 TP321H Stainless Steel Seamless Tube For Heat Exchanger
Grade: TP321H
Manufacturing Process: Cold Drawn or Cold Rolled
Tube Type: Straight Tubes or U-Bent Tubes
Outside Diameter (OD): 1/2" (12.7 mm) to 5" (127 mm)
Schedule/Wall: BWG 14, 16, 18 or specified decimal thickness Length: 6 meters, 12 meters, or customized Single/Double Random Length.
Heat Treatment: Solution Annealed at min. 1900°F (1040°C) followed by rapid quenching.
Surface Finish:Pickled & Annealed ,Bright Annealed
Ends: Plain Ends , Deburred
Sample：Available
Transport Package：Standard Sea-Worthy Packing
SS 321h Tube Supplier, Manufacturer,Exporter
We are a professional manufacturer and supplier of ASTM A213 TP321/321H seamless tubes, capable of producing seamless tubes of various sizes for heat exchange systems.
GNEE supplies ASTM A213 TP321H stainless steel tubes, a specific grade of seamless austenitic stainless steel pipes designed for high-temperature applications such as boilers and heat exchangers. The manufacturing process of TP321H seamless stainless steel bright tubes begins with piercing and extrusion.
ASTM A213 TP321H high-temperature seamless heat exchanger tubes are available with outer diameters ranging from 6.35 mm to 127 mm, with commonly stocked wall thicknesses including 14 BWG (2.11 mm), 16 BWG (1.65 mm), and 18 BWG (1.25 mm). A strict ±10% wall thickness tolerance is maintained to ensure consistency in heat transfer performance.
To achieve a bright surface finish, the tubes are annealed in a high-vacuum furnace or in protective atmospheres such as hydrogen or argon, which relieves internal stress and prevents oxidation. The working temperature range is 425°C to 850°C. Finally, ASTM A213 TP321H heat exchanger tubes undergo finishing and inspection processes, including straightening, cutting, non-destructive testing, and hydrostatic testing.
When connecting with flanges, it is generally recommended to match ASTM A182 F321H butt-weld stub ends with lap joint flanges, or to embed the tubes into tube sheet flanges through mechanical expansion combined with strength welding. GNEE controls the hardness of factory-supplied ASTM A213 TP321H small-diameter straight tubes strictly below 80 HRB, ensuring excellent plastic deformation capability and airtight sealing during flange assembly and tube sheet expansion, enabling reliable performance under high-pressure thermal cycling conditions.
Specification
ASTM A213 TP321H Stainless Steel round Tube Chemical Composition
| Symbol | Composition (%) |
| C | 0.04 – 0.10 |
| Mn | 2.00 max |
| P | 0.045 max |
| S | 0.030 max |
| Si | 1.00 max |
| Cr | 17.0 – 19.0 |
| Ni | 9.0 – 12.0 |
| Ti |
4×(C+N)min / 0.70 max |
Mechanical Properties (at Room Temp)
| Property | Metric Value | Imperial Value |
| Tensile Strength, min | 515 MPa | 75 ksi |
| Yield Strength (0.2% Offset), min | 205 MPa | 30 ksi |
| Elongation (in 2in. or 50mm), min | 35% | 35% |
| Hardness (Rockwell B), max | 90 HRB | 90 HRB |
| Hardness (Brinell), max | 192 HBW | 192 HBW |
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 |
ASTM A213 TP321/321HStainless Steel Tube Weight
|
Outside Diameter |
Stainless Steel Tube Weight (kg/m) |
||||||
|
Birmingham wire Gauge Conversion from BWG to mm |
|||||||
|
mm |
inch |
20 BWG |
18 BWG |
16 BWG |
14 BWG |
12 BWG |
10 BWG |
|
6.35 |
1/4" |
0.121 |
0.158 |
0.193 |
/ |
/ |
/ |
|
9.53 |
3/8" |
0.192 |
0.256 |
0.324 |
0.390 |
0.466 |
/ |
|
12.7 |
1/2" |
0.262 |
0.354 |
0.454 |
0.557 |
0.685 |
0.788 |
|
15.88 |
5/8" |
0.332 |
0.452 |
0.585 |
0.724 |
0.905 |
1.057 |
|
19.05 |
3/4" |
0.403 |
0.550 |
0.715 |
0.890 |
1.123 |
1.325 |
|
25.4 |
1" |
0.543 |
0.746 |
0.976 |
1.224 |
1.561 |
1.863 |
|
31.75 |
1-1/4" |
0.684 |
0.942 |
1.237 |
1.558 |
2.000 |
2.401 |
|
38.1 |
1-1/2" |
/ |
1.139 |
1.498 |
1.892 |
2.438 |
2.939 |
|
44.5 |
1-3/4" |
/ |
1.336 |
1.761 |
2.228 |
2.879 |
3.481 |
|
50.8 |
2" |
/ |
1.531 |
2.020 |
2.559 |
3.314 |
4.014 |
|
63.5 |
2-1/2" |
/ |
/ |
2.542 |
3.227 |
4.190 |
5.090 |
|
76.2 |
3" |
/ |
/ |
3.064 |
3.894 |
5.067 |
6.166 |
|
88.9 |
3-1/2" |
/ |
/ |
3.586 |
4.562 |
5.943 |
7.241 |
|
101.6 |
4" |
/ |
/ |
4.108 |
5.229 |
6.819 |
8.317 |
|
114.3 |
4-1/2" |
/ |
/ |
/ |
5.897 |
7.696 |
9.393 |
What's the difference between ASTM A213 TP321H and TP321?
321 stainless steel pipe has a lower carbon content (≤0.08%) and no minimum carbon content requirement. It prioritizes intergranular corrosion resistance but doesn't guarantee high-temperature strength. Therefore, it cannot directly replace TP321H for high-temperature, pressure-containing components compliant with ASME standards.
What is the maximum service temperature for TP321H?
TP321H can maintain its oxidation resistance in environments up to 1500°F (816°C). However, in pressure structures (such as boiler tubes), it is typically used in the range of 1100°F - 1300°F (593°C - 705°C) to take advantage of its excellent creep rupture properties.
ASTM A213 TP321H Stainless Steel Heat Exchanger Tube Industry application
Power Plant Boilers: superheater tubes, reheater tubes, and high-temperature, high-pressure steam pipelines
Petrochemical Industry: ethylene cracking furnace tubes, hydrogen conversion furnace tubes, and various high-temperature heat exchangers
Pressure Vessels: Manufacturing container components that withstand high temperatures.
ASTM A213 TP321H Stainless Steel Seamless Tube Price
| Outside Diameter (OD) | Wall Thickness (WT) | Price per Meter (USD) | Price per kg (USD) |
| 3/4" (19.05 mm) | 16 BWG (1.65 mm) | $6.00 - $8.00 | $9.50 - $11.50 |
| 1" (25.40 mm) | 14 BWG (2.11 mm) | $8.50 - $11.00 | $9.00 - $11.00 |
| 1.25" (31.75 mm) | 12 BWG (2.77 mm) | $13.50 - $16.00 | $9.00 - $10.50 |
| 1.5" (38.10 mm) | 10 BWG (3.40 mm) | $18.00 - $22.00 | $8.50 - $10.00 |
GNEE offers high-quality ASTM A213 TP321 stainless steel pipes at wholesale prices. As a procurement manager, you can find the best deals to meet your industry's needs. We are a trusted partner, offering reliable supply and cost-effective solutions.
Click to get the most competitive prices for SS 321H pipe
inspection
Each tube shall be subjected to the nondestructive electric test or hydrostatic test, Manufacturer Material Test Certification as per EN 10204 3.1 should be provided.
Tensile property, Elongation
Hardness testing, Brinell, Rockwell, Vickers hardness
Flattening testing
Flaring testing
Hydrostatic or Nondestructive test
Intergranular Corrosion Test – ASTM A262/E (option)
For every batch of ASTM A213 TP321H stainless steel heat exchanger tubes, we provide EN 10204 3.1/3.2 Material Test Certificates (MTC), ensuring full traceability from raw materials to finished products.
high quality packaging
Surface Condition: Pickled & Annealed (standard) or Bright Annealed (for high purity).
Ends: Square cut, deburred, and protected with plastic end caps.
Marking: Continuous stencil marking (Brand, Standard, Grade, Size, Heat No., Lot No.).
Packing: Sea-worthy fumigated wooden boxes with VCI moisture-proof plastic wrapping.
Wooden crate packaging
Pipe cap protection
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