ASTM A312 TP321 Seamless Stainless Steel Pipe
Cold rolled 321 seamless stainless steel pipe is a titanium stabilized austenitic stainless steel that achieves high-precision dimensional control and smooth surface through the cold rolling process. It is widely used in energy, chemical, automotive and other fields.
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Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of astm a312 tp321 seamless stainless steel pipe in China. With abundant experience, we warmly welcome you to wholesale customized astm a312 tp321 seamless stainless steel pipe from our factory. For price consultation, contact us.
ASTM A312 TP321 stainless steel cold-rolled tube has a surface finish of Ra≤0.8μm, reduces fluid resistance, has an outer diameter deviation of ±0.5%~±1%, and a wall thickness deviation of ±10%. It can work below 815℃ for a long time and withstand 1000℃ for a short time. It is suitable for boilers and heat exchangers.
ASTM A312 TP321 high temperature resistant stainless steel tube has titanium (Ti) to inhibit the precipitation of chromium carbide and avoid intergranular corrosion at sensitization temperature (427-815℃), which is better than 304 stainless steel.
SA312 TP321 round pipe
ASTM A312 TP321 Exhaust Pipes Equivalent material grade
| MATERIAL | UNS | WERKSTOFF NR. |
| USA | GERMAN | |
| TP321 | S32100 | 1.4541 |
Chemical Structure of ASTM A312 TP321 stainless steel cold finished pipe
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 5(C+N) – 0.70 max |
Mechanical Specification of A312 TP321 Schedule 40 Pipes
| Density | 8.0 g/cm3 |
| Melting Point | 1454 °C (2650 °F) |
| Tensile Strength | Psi - 75000 , MPa - 515 |
| Yield Strength (0.2%Offset) | Psi - 30000 , MPa - 205 |
| Elongation | 35 % |
What is the difference between 321 stainless steel pipe and 304, 316 stainless steel cold rolled pipe?
| Property | TP321 Stainless Steel | 304 Stainless Steel | 316 Stainless Steel |
|---|---|---|---|
| Titanium (Ti) | 5×C~0.70% (Titanium-stabilized) | None | None |
| Long-Term High-Temperature Resistance | ≤815°C (1500°F) | ≤870°C (1600°F) | ≤870°C (1600°F) |
| Intergranular Corrosion Resistance | Excellent (Titanium prevents carbide precipitation) | Good | Excellent (Low carbon) |
| Typical Applications | High-temperature sulfur-containing environments, welded structures | General corrosion resistance (e.g., food machinery) | Chloride-rich media (e.g., seawater, chemical processing) |
ASTM A312 TP 321 seamless pipe Suppliers
FAQ
Q: What is the difference between TP321 and 321H?
A: 321H has a higher carbon content (0.04-0.10%) and better high temperature strength, suitable for long-term operation at 650-900℃.
Q: Does TP321 need heat treatment after welding?
A: No additional heat treatment is required, but attention should be paid to the welding process (347 welding wire is recommended to avoid titanium burning).
Q: Can TP321 be used in food machinery?
A: It can replace 304/316 for food equipment with non-chlorine-containing media, but the surface finish must meet the hygiene standards.
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