X6CrNiMoTi17-12-2
Titanium-stabilized 316. Titanium binds the carbon and prevents sensitization in welding and at high temperature; a common grade in German and Central European process plants.
- Rp0.2 · MPa
- ≥ 220
- Rm · MPa
- ≥ 520
- TEMPERATURE
- −196 … +815 °C
- COST
Chemical composition
Mechanical properties
| STANDARD · CONDITION | Rp0.2 MPa | Rp1.0 MPa | Rm MPa | A % | KV J |
|---|---|---|---|---|---|
| EN 10088-2 · hot-rolled plate (P) | 220 | 260 | ≥ 520 | 40 | 60 |
| EN 10088-3 · bar, t ≤ 160 mm | 200 | — | 500–700 | 40 | — |
| ASTM · 316Ti (S31635) | 205 | — | ≥ 515 | 40 | — |
Room temperature, solution annealed. KV ≥ 60 J (+20 °C and −196 °C, transverse).
Minimum Rp0.2 at elevated temperature
| EN · TEMPERATURE | 20 °C | 100 °C | 200 °C | 400 °C |
|---|---|---|---|---|
| Rp0.2 MPa | 220 | 185 | 167 | 135 |
EN 10028-7 / EN 10088 values; the minimum proof strength used in pressure equipment design.
Service temperature
This is the limit of the material itself. A valve's service temperature is usually set by the seal and seat materials; product pages give it for each seal option.
Physical properties and heat treatment
- DENSITY
- 8.0 kg/dm³
- MODULUS OF ELASTICITY (20 °C)
- 200 GPa
- THERMAL EXPANSION (20–100 °C)
- 16.5 × 10⁻⁶ /K
- THERMAL CONDUCTIVITY (20 °C)
- 15 W/m·K
- SPECIFIC HEAT (20 °C)
- 500 J/kg·K
- ELECTRICAL RESISTIVITY
- 0.75 µΩ·m
- MAGNETISM
- non-magnetic (solution annealed)
- CRITICAL PITTING TEMPERATURE, CPT (TYPICAL)
- 15 ± 2 °C
- HEAT TREATMENT
- Solution annealing 1070 ± 40 °C, rapid cooling.
Media suitability GENERAL TREND
Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.
Strengths and weaknesses
Strengths
- Stable against sensitization in welding and at high temperature
- Higher strength than 316L at elevated temperature
- Corrosion resistance equivalent to 316
Weaknesses
- Titanium carbonitrides leave marks on polished surfaces: not preferred for hygienic surfaces
- Titanium may be lost in the weld seam
- Not as readily available as 316L in some markets
Manufacturing and use
- ECONOMY
- Medium; slightly more expensive than 316L.
- MANUFACTURING METHODS
- Machining from plate and bar · Welded construction
- TYPICAL VALVE PARTS
- Body · Stem · Heat-exposed parts
Used in 3 Emsal products
- 001Wafer check valveBody
- 310Metal bellows axial expansion jointBellows · Flange · Liner
- 311Rubber expansion jointFlange
Source: EN 10088-2 / -3. Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.