Performance comparison of 321 stainless steel and 316 stainless steel
Performance comparison of 321 stainless steel and 316 stainless steel
321 stainless steel, due to its titanium stabilization treatment, effectively prevents intergranular corrosion, thus performing excellently in high-temperature applications; while 316 stainless steel, containing molybdenum, exhibits stronger corrosion resistance in environments rich in chlorides and chemicals. The specific choice depends on the application environment: 321 stainless steel is ideal for welded structures in high-temperature environments such as aircraft exhaust, while 316 stainless steel is ideal for marine or chemical equipment.
What are the uses of 321 stainless steel?
It is ideal for manufacturing heat exchangers, pressure vessels, and storage tanks. Thermal equipment: Boilers, heat exchangers, and furnace components are often made of 321 stainless steel because of its excellent heat resistance and oxidation resistance. It is also commonly found in industrial heat treatment equipment.
321 vs 316 Stainless Steel – What's the Difference
| Feature | 316 Stainless Steel | 321 Stainless Steel |
|---|---|---|
| Core Advantage | Excellent corrosion resistance, especially against chlorides | Excellent high-temperature resistance and resistance to intergranular corrosion |
| Key Alloying Element | Molybdenum | Titanium |
| Best Working Environment | Marine environments, chemical processing, and food processing | High-temperature environments (425–850°C), such as exhaust systems and furnace parts |
| Weldability | Good, but thick sections may require post-weld annealing | Excellent, typically no post-weld heat treatment needed |
| Cost & Versatility | Usually higher (due to expensive molybdenum and nickel) | Usually lower (compared to 316) |
The Equivalents of 321 and 316 Stainless Steel:
| GB/T | 321 | 316 |
|---|---|---|
| ASTM/UNS | 321 / S32100 | 316 / S31600 |
| EN | X6CrNiTi18-10 (1.4541) | X5CrNiMo17-12-2 (1.4401) |
| JIS | SUS 321 | SUS 316 |
| GOST | 08Х18Н10Т | 03Х17Н14М3 |
Chemical Composition of 321 vs 316 Stainless Steel
| Element | Grade 316 Stainless Steel | Grade 321 Stainless Steel |
|---|---|---|
| C | 0.08 max | 0.08 max |
| Mn | 2.00 max | 2.00 max |
| Si | 0.75 max | 0.75 max |
| P | 0.045 max | 0.045 max |
| S | 0.030 max | 0.030 max |
| Cr | 16.00 – 18.00 | 17.00 – 19.00 |
| Ni | 10.00 – 14.00 | 9.00 – 12.00 |
| Mo | 2.00 – 3.00 | – |
| Ti | – | 5 * C – 0.70 |
Physical Properties of 321 vs 316 Stainless Steel:
| Property | Grade 316 | Grade 321 |
|---|---|---|
| Density (g/cm³) | 7.98 | 7.92 |
| Melting Point (°C) | 1398 – 1420 | 1398 – 1420 |
| Specific Heat (J/kg·K) | 500 | 500 |
| Thermal Conductivity (W/m·K) | 16.2 | 16.3 |
| Electrical Resistivity (µΩ·m) | 740 | 720 |
| Modulus of Elasticity (GPa) | 193 | 193 |
| Poisson's Ratio | 0.3 | 0.3 |
| Thermal Expansion (10^-6/K) | 16.5 – 16.7 | 16.5 – 16.9 |
Mechanical Properties of 321 vs 316 Stainless Steel:
| Property | Grade 316 | Grade 321 |
|---|---|---|
| Tensile Strength (MPa) | 515 – 690 | 515 – 850 |
| Yield Strength (0.2% offset) (MPa) | 205 – 260 | 205 – 230 |
| Elongation (%) | 30 – 40 | 35 – 40 |
| Hardness (Brinell HB) | ≤ 217 | ≤ 217 |
Please note that these values are approximate and can vary based on factors such as specific product forms, heat treatment, and testing methods. Mechanical properties can also be affected by variations in manufacturing processes. Always refer to the latest technical specifications or standards for the most accurate and up-to-date information.
Gnee Steel specializes in the production of a wide range of stainless steel products. Gnee Steel's product packaging includes: Steel Strapping: Pipes with an outer diameter of 3 inches or less are typically strapped together with polypropylene film to prevent rust during ocean shipping, and then secured with steel strapping. Wooden Cases/Crates: Pipes are typically packaged in wooden cases or crates to protect the pipes during transportation, especially those that are longer or have larger diameters. Seaworthy Export Packaging: Suppliers typically use standard seaworthy export packaging methods, which may include a variety of materials and techniques to protect the pipes during transportation. Tarpaulin Packaging: This prevents rain, seawater, and other external factors from penetrating the export crates during transportation. Gnee Steel specializes in the production and sale of alloy materials. Gnee Steel's products are widely used in the aerospace, chemical, power, automotive, and nuclear energy sectors, and we can provide customized alloy material solutions based on customer needs. For alloy material pricing or customized alloy material solutions, please contact us for a quote: ru@gneesteelgroup.com
