SS321 (UNS S32100) is a titanium (Ti) stabilized austenitic stainless steel. By adding titanium, the precipitation of chromium carbide is effectively inhibited, and the intergranular corrosion resistance and high-temperature stability are significantly improved. As a pipeline material, it is suitable for high temperature (400-900℃) and corrosive environments such as petrochemical, aerospace, and energy equipment.
S321 pipe Standard
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
SS 321/321H Pipes Chemical Composition
| Element | SS 321 | SS 321H |
| C | 0.08 max | 0.04 – 0.10 |
| Mn | 2.0 max | 2.0 max |
| Si | 1.0 max | 1.0 max |
| P | 0.045 max | 0.045 max |
| S | 0.030 max | 0.030 max |
| Cr | 17.00 - 19.00 | 17.00 - 19.00 |
| N | 0.10 max | 0.10 max |
| Ni | 9.00 - 12.00 | 9.00 – 12.00 |
| Ti | 5(C+N) – 0.70 max | 4(C+N) – 0.70 max |
Stainless Steel 321/321H Pipes Mechanical & Physical Properties
| Element | SS 321/321H |
| 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% |
| Hardness, HB(max) | 217 |
321 stainless steel pipe High temperature oxidation resistance
Chromium forms a dense Cr₂O₃ film below 900℃, which can withstand sulfur-containing flue gas, molten salt and combustion exhaust gas, and the continuous use temperature reaches 870℃ (intermittent use can reach 925℃).
S32100 pipe Anti-intergranular corrosion
Titanium stabilized design passes ASTM A262 Practice E test (nitric acid method) and has no tendency to intergranular corrosion in the welding or sensitization temperature range.
Application of ss321 pipe
Oil and gas: submarine pipelines, downhole tools for acid gas wells.
Chemical equipment: sulfuric acid reactors, phosphoric acid evaporators, pickling equipment.
Nuclear industry: containers and pipelines for nuclear waste treatment systems.
Marine engineering: seawater desalination devices, heat exchangers.
Environmental protection: key components of flue gas desulfurization (FGD) systems.
Material Testing of stainless steel 321 pipe
- Hardness Test
- Chemical Analysis – Spectro Analysis
- Positive Material Identification – PMI Testing
- Flattening Test
- Micro and MacroTest
- Pitting Resistance Test
- Flaring Test
- Intergranular Corrosion (IGC) Test
Stainless steel 321 pipe Manufacturer, supplier
HT PIPE is a leading stockist and global exporter with over 15 years of expertise in international trade. We supply UNS S32100 pipes, plates, round bars, and a comprehensive range of pipe fittings, flanges, and valves. Contact us now for free quotes and personalized product information.
