ASTM A213 UNS S32100 / TP321 PA Stainless Steel Tube EN 1.4541 Steel Heat Exchanger Tube
ASTM A213 TP321 / UNS S32100 Stainless Steel Seamless Tube Pickled and Annealed Heat Exchanger Tube
ASTM A213 UNS S32100 / TP321 Pickled and Annealed EN 1.4541 Heat Exchanger Tube is a seamless austenitic stainless steel tube made from titanium-stabilized 18Cr-10Ni stainless steel, grade TP321 / UNS S32100, equivalent to EN 1.4541 / X6CrNiTi18-10. It is supplied in the pickled and annealed (P&A) condition — solution annealed at about 1050–1120°C and then acid pickled to remove heat scale and restore a clean, passive surface. It is designed mainly for boilers, superheaters, condensers, and shell-and-tube heat exchangers.
Heat Treatment & Surface Condition
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Solution Annealing: 1050–1120°C, followed by rapid cooling (water or air).
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Pickling: Nitric-hydrofluoric acid mixture to remove heat scale and chromium-depleted surface layer.
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Surface Finish: Matte grey/white, clean and passivated.
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Common Condition: Pickled & Annealed (P&A).
Equivalent Grade of ASTM A213 UNS S32100 / TP321 PA Stainless Steel Tube EN 1.4541 Steel Heat Exchanger Tube
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
Chemical Composition % of ASTM A213 UNS S32100 / TP321 PA Stainless Steel Tube EN 1.4541 Steel Heat Exchanger Tube
| C | Mn | P | S | Si | Cr | Ni | Ti |
| 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 9.0-12.0 | 5(C+N)-0.7 |
Mechanical Properties of ASTM A213 UNS S32100 / TP321 PA Stainless Steel Tube EN 1.4541 Steel Heat Exchanger Tube
| Tensile Strength min. | Yield Strength min. | Elongation (%) | Hardness max | |
| 75ksi (515MPa) | 30ksi (205MPa) | 35min | 192HBW/200HV | 90 HRB |
Testing & Documents
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Chemical analysis
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Tensile and hardness tests
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Hydrostatic test
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Eddy current test
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Ultrasonic test
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PMI (Positive Material Identification)
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Intergranular corrosion test per ASTM A262 Practice E
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Flattening and flaring tests
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Material Test Certificate: EN 10204 3.1
- Shell-and-tube heat exchangers
- Condensers and boilers
- Superheaters and reheaters
- Petrochemical and chemical plants
- Power generation
- Pharmaceutical and food processing
- Nuclear and marine piping
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