Standard Specification for Welded Titanium and Titanium Alloy Pipe
Scope:
ASTM B862 covers welded titanium and titanium alloy pipe for use in:
General corrosion-resistant applications
Industrial piping systems
Structural, pressure-bearing components
Power generation and chemical processing systems
This specification includes fusion-welded pipes manufactured from flat-rolled titanium and titanium alloy products, with or without filler metal, followed by cold working and annealing.
Applicable Grades (UNS Designations)
|
Grade |
UNS Number |
Description |
|
Gr 1 |
R50250 |
Commercially pure, softest, high ductility |
|
Gr 2 |
R50400 |
Most commonly used, excellent weldability |
|
Gr 3 |
R50550 |
Higher strength CP titanium |
|
Gr 4 |
R50700 |
Strongest CP titanium |
|
Gr 5 |
R56400 |
Ti-6Al-4V, high strength, structural use |
|
Gr 7 |
R52400 |
CP titanium with Pd, corrosion-resistant |
|
Gr 12 |
R53400 |
Ti-0.3Mo-0.8Ni, good strength & corrosion |
|
Others |
Various |
Gr 9, Gr 23, etc., on agreement |
Dimensions and Size Range
|
Category |
Range |
|
Nominal Pipe Size |
1/8" – 6" NPS (DN6–DN150) |
|
Outside Diameter |
Approx. 10 mm – 168 mm |
|
Wall Thickness |
SCH 5S, 10S, 40S, 80S, XS, XXS |
|
Length |
Standard: 6 meters (20 ft); or specified |
Pipes follow ASME B36.10M / B36.19M dimensions unless otherwise agreed.
Manufacturing Process
Base Material: Titanium/titanium alloy strip or plate
Welding Process:
Gas Tungsten Arc Welding (GTAW/TIG), Plasma Arc Welding (PAW), or Laser
With or without filler metal
Post-Weld Treatment:
Cold working
Annealing (required unless agreed otherwise)
Surface Finish: Smooth, free of scale, contamination, or oxidation
Dimensional Tolerances (per ASTM B862 Table 2)
Outside Diameter (OD) Tolerances:
|
OD Range (mm) |
Tolerance (± mm) |
|
≤ 25.4 |
±0.13 |
|
> 25.4 – ≤ 38.1 |
±0.25 |
|
> 38.1 – ≤ 50.8 |
±0.38 |
|
> 50.8 |
±0.76 |
Wall Thickness Tolerance:
±12.5% of nominal wall thickness unless otherwise specified.
Length Tolerances:
Specified Length: ±3.2 mm (±1/8 inch)
Random Length: per agreement
Straightness:
Usually not specified but can be agreed upon.
Mechanical Properties (Annealed Condition)
|
Grade |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
|
Gr 2 |
≥ 344 |
≥ 275 |
≥ 20 |
|
Gr 5 |
≥ 895 |
≥ 828 |
≥ 10 |
|
Gr 12 |
≥ 483 |
≥ 345 |
≥ 18 |
Values vary depending on grade and pipe dimensions.
Testing Requirements
Chemical Analysis-Confirms composition per ASTM spec (e.g. B348)
Mechanical Testing-Tensile strength, yield, elongation
Weld Integrity Inspection-Visual & optional radiographic/ultrasonic (by agreement)
Hydrostatic or Air Pressure Test-Optional unless specified
NDT (Non-Destructive Testing):
Required if agreed, usually eddy current or ultrasonic for weld seam
Marking and Certification
Each pipe shall be clearly marked with:
Manufacturer’s name or logo
Grade
Condition (annealed)
Heat/Lot Number
Pipe Size and Schedule
Mill Test Report (MTR) must include:
Chemical composition
Mechanical properties
Weld info
NDT/hydro test results (if applicable)
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