ASTM A269 TP321 Stainless Steel Welded Tube for Electro Thermal
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ASTM A269 TP321 is a titanium-stabilized, welded stainless steel pipe designed for high-temperature, corrosion-resistant applications, particularly in electrical and heating equipment where resistance to carbide precipitation is critical. The addition of titanium prevents intergranular corrosion during welding and high-temperature operation, and the material is designed for use in environments up to 900°C (1652°F).
The ASTM A269/ASME SA269 TP321 welded stainless steel pipes supplied by GNEE are a corrosion-resistant piping solution based on titanium-stabilized austenitic stainless steel. The core value of TP321 welded stainless steel pipes in the electric heating industry lies in their ability to replace seamless pipes with a 30%–50% cost advantage, while meeting the oxidation and corrosion resistance requirements of medium-to-high temperature applications. Their reliability has been proven in applications such as resistance sheaths, hot air ducts, and electrode boilers. The ASME SA269 TP321 small-diameter welded stainless steel pipes (with diameters ranging from 6 to 25 mm) are particularly well-suited for tightly spaced heating elements. Compared to SA269 TP321 seamless pipes, they offer comparable performance advantages at significantly lower batch production costs.
Chemical Composition (Weight %)
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Nickel (Ni) | Titanium (Ti) |
|---|---|---|---|---|---|---|---|---|
| Requirement | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤0.75 | 17.0–19.0 | 9.0–13.0 | ≥5×(C+N), ≤0.70<sup>1</sup> |
SA 269 TP 321 Welded Tubes Mechanical Properties
| Grade | Yield Strength 0.2% Proof (MPa) minimum | Tensile Strength (MPa) minimum | Elongation (% in 50 milimeter) minimum | Hardness | |
| Rockwell B (HR B) maximum | Brinell (HB) maximum | ||||
| 321 | 205 | 515 | 40 | 95 | 217 |
| 321H | 205 | 515 | 40 | 95 | 217 |
SA 269 Grade TP321 Coil Tubing Physical Properties
| Grade | Elastic Modulus (GPa) | Density (kg/m3) | Thermal Conductivity (W/m.K) | Mean Coefficient of Thermal Expansion (m/m/0C) | |||
| at 5000C | at 1000C | 0-3150C | 0-1000C | 0-5380C | |||
| 321 | 193 | 8027 | 22.2 | 16.1 | 17.2 | 16.6 | 18.6 |
Application:
1. Heating element sheaths. Encapsulated resistance wire/PTC heaters
2. High-temperature fluid pipelines. Thermal oil/electrode boiler pipelines
3. Precision heat exchange systems. Semiconductor equipment gas pipelines, micro thermal probes
4. Hot air circulation ducts. Electric hot air furnaces, drying line ducts
GNEE provides customized TP321 seamless/welded pipes, supports cold/hot processing, TIG/MIG welding, and is suitable for a wide temperature range of -196℃~900℃. It can meet the requirements of demanding scenarios such as marine engineering and high-temperature boilers, and provides a variety of options such as electrolytic polishing and different wedge interfaces. Email: info@gneestainless.com
Our ASTM A269 stainless steel pipes come with a factory warranty and third-party testing reports (such as eddy current testing, hydrostatic testing, chemical composition analysis, and corrosion testing) before shipment, ensuring that each welded pipe meets dimensional accuracy (OD tolerance ±0.10 mm, wall thickness tolerance ±10%) .
