321 vs 316Ti
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
321
Stainless Steel
321 is a titanium-stabilised 18-10 stainless developed for welded equipment operating between 425 and 900 °C, where unstabilised 304 would sensitise. It is a long-standing aircraft and exhaust-system grade.
Standards: DIN 1.4541 · AISI 321 · JIS SUS321 · GB 06Cr18Ni11Ti
316Ti
Stainless Steel
316Ti is the titanium-stabilised version of 316, long standardised in European practice as 1.4571. The titanium binds carbon so welds resist intergranular corrosion, and it retains strength better than 316L in the 400–800 °C range.
Standards: DIN 1.4571 · AISI 316Ti · JIS SUS316Ti · GB 06Cr17Ni12Mo2Ti
Chemical composition compared (%)
| Element | 321 | 316Ti |
|---|---|---|
| C | ≤0.08 | ≤0.08 |
| Si | ≤0.75 | ≤0.75 |
| Mn | ≤2.00 | ≤2.00 |
| P | ≤0.045 | ≤0.045 |
| S | ≤0.030 | ≤0.030 |
| Cr | 17.00–19.00 | 16.50–18.50 |
| Ni | 9.00–12.00 | 10.50–13.50 |
| Ti | 5×(C+N)–0.70 | 5×C–0.70 |
| N | ≤0.10 | — |
| Mo | — | 2.00–2.50 |
Properties compared
| Property | 321 | 316Ti |
|---|---|---|
| Delivery condition | Annealed | Annealed |
| Hardness | ≤217 HB (annealed) | ≤217 HB (annealed) |
| Tensile strength | 515–690 MPa | 515–690 MPa |
| Density | 7.90 g/cm³ | 7.90 g/cm³ |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: 321 · 316Ti. Substitution decisions for certified parts stay with the design authority.