ASTM A312 TP321 / UNS S32100 Stainless Steel Seamless Pipe Industrial Pipe
ASTM A312 / ASME SA312 TP321 / UNS S32100 Stainless Steel Seamless Pipe
TP321 / UNS S32100 is a robust choice for applications demanding thermal stability and corrosion resistance, especially where welding is involved. Always confirm project-specific requirements with engineering standards. Composition: Chromium (17–19%), Nickel (9–12%), Titanium (≥5xC% min, typically 0.4–0.7%). Titanium Stabilization: Added to prevent sensitization (chromium carbide precipitation at grain boundaries) during welding or exposure to 425–815°C (800–1500°F). This enhances corrosion resistance post-welding.
Equivalent Material of TP321, TP321H Stainless Steel seamless Pipe
Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
BS | En | No | Name | ||||
321 | S32100 | 321S31 | 58B, 58C | 1.4541 | X6CrNiTi18-10 | 2337 | SUS 321 |
321H | S32109 | 321S51 | - | 1.4878 | X10CrNiTi18-10 | - | SUS 321H |
These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted. | |||||||
Chemical Composition of ASTM A312 TP321 Stainless Steel Seamless Pipes
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Other | |
| 321 | min. max | - 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 | - | 9.0 12.0 | 0.10 | Ti=5(C+N) 0.70 |
| 321H | min. max | 0.04 0.10 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 | - | 9.0 12.0 | - | Ti=4(C+N) 0.70 |
Mechanical Properties of ASTM A312 TP321 Stainless Steel Seamless Pipes
| Grade | Tensile Strength | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 321 | 515 | 205 | 40 | 95 | 217 |
| 321H | 515 | 205 | 40 | 95 | 217 |
| 321H also has a requirement for a grain size of ASTM No 7 or coarser. | |||||
Physical Properties of ASTM A312 TP321 Stainless Steel Seamless Pipes
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C (J/kg.K) | Electrical Resistivity (nΩ.m) | |||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| 321 | 8027 | 193 | 16.6 | 17.2 | 18.6 | 16.1 | 22.2 | 500 | 720 |
Applications
Heat exchangers, boilers, superheaters
Petrochemical/oil & gas refining
Aircraft exhaust systems
Food processing equipment
Pharmaceutical and chemical plants
High-temperature piping in power plants
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.