X6CrNiTi18-10
Titanium-stabilized 304. Resistant to sensitization at high temperature; used in steam, hot gas and exhaust lines and in metal bellows expansion joints.
- Rp0.2 · MPa
- ≥ 200
- Rm · MPa
- 500–700
- TEMPERATURE
- −196 … +650 °C
- COST
Chemical composition
Cast analysis, %. S: ≤ 0.015 in plate, ≤ 0.030 in bar.
Mechanical properties
| STANDARD · CONDITION | Rp0.2 MPa | Rp1.0 MPa | Rm MPa | A % | KV J |
|---|---|---|---|---|---|
| EN 10088-2 · hot-rolled plate (P), t ≤ 75 mm | 200 | 240 | 500–700 | 40 | 60 (transverse) |
| EN 10088-3 · bar, t ≤ 160 mm | 190 | 225 | 500–700 | 40 | 100 |
| EN 10028-7 · −196 °C | 390 | 470 | ≥ 1200 | 30 | — |
| ASTM A240 · 321 | 205 | — | ≥ 515 | 40 | — |
Room temperature, solution annealed.
Minimum Rp0.2 at elevated temperature
| EN · TEMPERATURE | 20 °C | 100 °C | 200 °C | 400 °C |
|---|---|---|---|---|
| Rp0.2 MPa | 200 | 176 | 157 | 125 |
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
- 7.9 kg/dm³
- MODULUS OF ELASTICITY (20 °C)
- 200 GPa
- THERMAL EXPANSION (20–100 °C)
- 16.0 × 10⁻⁶ /K
- THERMAL CONDUCTIVITY (20 °C)
- 15 W/m·K
- SPECIFIC HEAT (20 °C)
- 500 J/kg·K
- ELECTRICAL RESISTIVITY
- 0.73 µΩ·m
- MAGNETISM
- non-magnetic (solution annealed)
- CRITICAL PITTING TEMPERATURE, CPT (TYPICAL)
- < 10 °C
- HEAT TREATMENT
- Solution annealing 1050 ± 50 °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 structure at high temperature, no sensitization
- Better creep strength than 304L
- Good formability for bellows and thin-walled parts
Weaknesses
- Chloride resistance at the level of 304
- Poor polishability because of titanium
- No molybdenum: weak in reducing acids
Manufacturing and use
- ECONOMY
- Low to medium; slightly more expensive than 304.
- MANUFACTURING METHODS
- Thin sheet (bellows) · Pipe · Fabrication from plate and bar
- TYPICAL VALVE PARTS
- Metal bellows · Steam line parts · High-temperature trim
Used in 2 Emsal products
- 310Metal bellows axial expansion jointBellows · Flange · Liner
- 313Externally pressurized expansion jointOuter casing
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.