Standard Specification for Titanium and Titanium Alloy Welded and Seamless Fittings
Scope:
ASTM B363 covers welded and seamless pipe fittings made from commercially pure titanium and titanium alloys for:
Pressure piping systems
Chemical processing equipment
Marine, desalination, power generation, and aerospace applications
Fittings include:
Elbows
Tees
Reducers
Caps
Stub ends
Crosses
Applicable Grades (UNS Numbers)
|
Grade |
UNS Number |
Description |
|
Gr 1 |
R50250 |
Softest CP titanium |
|
Gr 2 |
R50400 |
Most commonly used CP grade |
|
Gr 3 |
R50550 |
Stronger CP grade |
|
Gr 5 |
R56400 |
Ti-6Al-4V, high strength |
|
Gr 7 |
R52400 |
CP + Pd, excellent corrosion resistance |
|
Gr 12 |
R53400 |
Ti-0.3Mo-0.8Ni, for corrosion and strength |
|
Gr 16 |
R52402 |
CP + Pd, like Gr 7 but more formable |
|
Gr 26 |
R52404 |
CP + Pd, improved corrosion resistance |
Additional alloys may be furnished by agreement.
Product Forms and Types
Welded fittings: Most common, made by welding sections or from welded pipe.
Seamless fittings: Made from seamless pipe or tube.
Butt-welded, socket-welded, or threaded ends depending on customer requirement and system design.
Size Range
|
Type |
Range |
|
Diameter |
½″ to 24″ nominal pipe size (NPS) or DN15–DN600 |
|
Wall Thickness |
SCH 5S to SCH XXS (or custom per ASME B36.1 |
Fittings are usually designed to match standard pipe dimensions per:
ASME B16.9 (for butt-weld fittings)
ASME B16.11, B16.5 for threaded/flanged variants (if applicable)
Tolerances
Fittings must meet tolerances as specified in ASME B16.9 or as agreed between purchaser and supplier.
Dimensions must be within ±1% or ±1.6 mm (whichever is greater), unless otherwise specified.
Manufacturing Requirements
Welding must be done using qualified procedures (GTAW/TIG is typical).
Welds must be:
Fully penetrated
Heat-treated if required
Free from cracks, porosity, and unacceptable defects
Annealing or stress relief may be required after welding depending on grade and application.
Seamless fittings are manufactured by cold forming, hot forming, or machining from billet.
Testing Requirements
Visual inspection of welds
Dimensional checks
Hydrostatic or air pressure test (optional or per purchaser's request)
Radiographic inspection (RT) or liquid penetrant testing (PT) of welds
Chemical composition must conform to ASTM B348 or B381 for the relevant grade
Mechanical properties must meet the minimum requirements for the specific alloy (see ASTM B348 / B381 / B265)
Marking and Certification
Each fitting shall be marked with:
Manufacturer’s name or logo
ASTM B363
Grade and heat number
Size (NPS/DN) and wall thickness
Heat lot traceability
Mill Test Reports (MTR) must include:
Chemical composition
Mechanical properties (if required)
Test results of weld inspections (if applicable)
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