ASTM A213 TP321H Stainless Steel Seamless Tube For Heat Exchanger
Shape：round
Technique：Cold Rolled
Surface Treatment：Sanded /Mirror/Hairline Brushed
Thickness：0.3-30mm
out Diameter：8-219mm
Length：5.8/6m or Custom
Stock：in Stock
Sample：Available
Transport Package：Standard Sea-Worthy Packing
SS 321h Tube Supplier, ASTM A213 TP321h Tubes
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
| Standard |
ASTM A213, ASME SA213 |
|
| Dimensions | ASTM, ASME, and API | |
| Size | 1/8″NB TO 5″NB IN | |
| Schedule | SCH5, SCH10, SCH40, SCH80, SCH160, XXS | |
| Thickness |
0.40 mm - 12.70 mm |
|
| Outside Diameter |
3.18 mm - 127 mm |
|
| End | Plain End, Beveled End, Treaded | |
| Length | Single Random, Double Random, Required Length & Cut Length | |
ASTM A213 TP321H Stainless Steel round Tube Chemical Composition
| Grade | TP321H |
| Ni | 9 – 12 |
| Cr | 17 – 19 |
| C | 0.04 – 0.10 |
| N | Balance |
| Fe | Balance |
| Mn | 2 max |
| Si | 0.75 max |
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 |
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.
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.
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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)
Stainless Steel 321H Tube Factory
high quality packaging
Packed in bundles or ply wooden box wrapped in plastic, and suitably protected for sea-worthily delivery or as requested.
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