Physical Properties
The physical properties of grade 18 Ti 3Al 2.5V 0.05Pd alloy are tabulated below.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 4.50 g/cm3 | 0.163 lb/in3 |
Mechanical Properties
The following table shows mechanical properties of grade 18 Ti 3Al 2.5V 0.05Pd alloy.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 621 – 740 MPa | 90100 – 107000 psi |
| Yield strength | 483 – 607 MPa | 70100 – 88000 psi |
| Elastic modulus | 91.0 – 107 GPa | 13200 – 15500 ksi |
| Elongation at break | 15 – 17 % | 15 – 17 % |
| Hardness, Rockwell C | 15 | 15 |
Product Name: Titanium Grade 18 Seamless / Welded Pipe
Alternate Names: Ti-0.04Pd (low palladium), UNS R53400
Key Properties
- Density: 4.47 g/cm³
- Tensile Strength: ≥345 MPa
- Yield Strength: ≥275 MPa
- Elongation: ≥24%
- Corrosion Resistance: Excellent in chloride, acidic, brine & seawater environments
- Weldability: Excellent
- Formability: Good
Standards
- ASTM B338, ASTM B861 (seamless)
- ASTM B862 (welded)
- ASME SB338, ASME SB861
- UNS: R53400
Available Types
- Seamless Pipe: Cold drawn / cold rolled
- Welded Pipe: ERW, automatic arc welded
Size Range (Typical)
- Outer Diameter (OD): 3mm–110mm (seamless); up to 1000mm (welded)
- Wall Thickness (WT): 0.5mm–5.5mm
- Length: Up to 19m
- Schedule: SCH 5, 10, 40, STD, 80, XS, 160
Surface Finish
- Bright Annealed (BA)
- Pickled
- Polished
- Sandblasted
Typical Applications
- Chemical processing equipment
- Heat exchangers & condensers
- Seawater desalination systems
- Offshore & marine piping
- Chloride-containing environments
- Pharmaceutical & food processing
Equivalent Grades
- UNS: R53400
- Grade 17: Higher Pd (0.12–0.25%)
- Grade 7: Higher Pd (0.12–0.25%)
- Grade 16: Ti-0.05Pd
- Grade 27: Ti-0.05Pd (higher oxygen)
Key Advantage
Gr 18 = Grade 2 base with low Pd (0.04–0.08%) → better corrosion resistance than pure Ti Gr 2, lower cost than Gr 7 / Gr 17