TI–PD GRADE 7 & GRADE 16
Ti-0.15Pd (Grade 7)
This alloy has mechanical properties similar to Commercially Pure Titanium Grade 2 but has improved resistance to general and localised crevice corrosion in a wide range °F reducing acid environments including chlorides, with a good balance °F moderate strength, reasonable ductility and excellent weldability.
Ti-0.05Pd (Grade 16)
Grade 16 is identical to Grade 7 with the exception that the palladium added to improve corrosion resistance is less than with Grade 7. Mechanical and physical properties, specifications and forms are all identical to those °F Grade 7.
The alloy composition differs by the reduction °F Pd to 0.04-0.08%.
Note: The poor availability and high cost °F palladium have led to the development °F ruthenium as an alternative alloy addition to provide similar enhancement °F corrosion resistance but at lower cost. The relevant ASTM Grades is 26 (CP Grade 2 + 0.1% Ru).
Mechanical and physical properties are °F the same order as described for grades 7 and 16.
Composition
C
Fe
N2
Pd 0.12-0,.25 % for Grade 7 and 0.04-0.08% for Grade 16
O2
H2(sheet)
H2(bar)
Ti ~ Rem
Specifications/Designations for Grades 11 and 17
ASTM B265
ASTM B337 Gr7 only
ASTM B338
ASTM B348
ASTM B363 (WPT)
ASTM B381
ASTM B861
ASTM B862
ASTM B863
ASTM F467 Gr7 Fasteners
ASTM F468 " "
See also ASTM list °F B367 casting grades °F palladium containing alloys for approximate equivalent specifications to the wrought grades above.
Physical Data
Typical
Density g/cm3 (lb/cu.in) 4.51 (0.162)
Melting Range°C±15°C (°F) 1677 (3051)
Specific Heat J/Kg/°C (BTU/lb/°F) 540 (.129)
Volume Electrical Resistivity mohm.cm(mohm.in) 56 (22)
Thermal Conductivity W/mk (BTU/ft h°F) 20.6 (143)
Mean Thermal Exp. Coeff. 0-100°C/°C (0 - 212°F/°F) 8.6x10-6 (4.8)
Mean Thermal Exp. Coeff. 0-300°C/°C (0 - 572°F/°F) 9.2x10-6 (5.1)
Beta Transus °C±15°C(°F) 913 (1675)
Mechanical Data
Minimum Typical
Tensile Strength MPa (ksi) 345 (50) 483 (70)
0.2% Proof Stress MPa (ksi) 376 (40) 352 (51)
Elongation over 2 inches % 20 28
Elastic Modulus GPa (Msi) 103 (15)
Hardness Bhn 160
Specified Bend Radius
Specified Bend Radius > 0.070in x Thickness 2.5
Welded Bend Radius x Thickness 3
Charpy,V-Notch Impact J(ft lbf) 41 (30)
Forms Available
Strip; Ingot & Bloom; Billet; Slab; Bar; Wire; Sheet; Plate; Forgings; Castings;
Tube-Welded
Fabrication
Weldability - Excellent
Forging - Rough 900°C (1650°F),
Finish 843°C (1550°F)
Annealing - 704°C (1300°F), 2hr, AC
Stress Relief Annealing - °C (°F), 45 mins.