Standard Specification for Seamless and Welded Titanium and Titanium Alloy Pipe
ASTM B337 covers seamless and welded straight-seam titanium and titanium alloy pipe for corrosive service, primarily in chemical and marine environments. This specification allows both seamless and welded forms, typically with larger diameters and wall thicknesses than ASTM B338 tubes.
1. Grades Covered
This specification includes commercially pure (CP) titanium and alloyed grades:
CP Titanium (Unalloyed): Gr. 1, 2, 3, 7, 11, 12, 16, 17, 26, 27
Alloyed Grades: Gr. 5 (Ti-6Al-4V), Gr. 9 (Ti-3Al-2.5V), Gr. 23 (Ti-6Al-4V ELI), Gr. 28, Gr. 29
The specific grade depends on required mechanical properties and corrosion resistance.
2. Dimensions and Size Range
|
Property |
Range (Typical) |
|
Outside Diameter (OD) |
1" to 24" (25.4 mm – 610 mm) or larger by agreement |
|
Wall Thickness |
Schedule 5S to 40S or custom (typically thicker than tube) |
|
Length |
Single, double random, or cut-to-length sections |
3. Tolerances
Standard tolerances unless otherwise specified:
|
Parameter |
Tolerance |
|
OD Tolerance |
±0.75% (minimum ±0.25 mm) |
|
Wall Thickness |
–0 / +15% of nominal |
|
Straightness |
1.5 mm per 1000 mm length |
|
Length Tolerance |
Per agreement or ±3.18 mm |
4. Mechanical Properties
(Depends on the grade selected)
|
Grade |
Tensile Strength (min, MPa) |
Yield Strength (min, MPa) |
Elongation (min, %) |
|
Gr 2 |
344 |
275 |
20% |
|
Gr 5 |
895 |
828 |
10% |
|
Gr 12 |
483 |
345 |
18% |
Tensile testing is required on each lot (for seamless pipe) or coil/plate source (for welded pipe).
5. Testing Requirements
Tensile Test-Required on a per-heat and per-size basis.
Flattening Test-For welded pipe to test seam integrity.
Hydrostatic Test or Nondestructive Examination (NDE)-Leak-tightness test required unless waived.
Visual Inspection-Surface and weld inspection for cracks, oxidation, inclusions.
Chemical Analysis-Must conform to ASTM grade limits.
6. Chemical Composition
Must conform to the composition limits of the relevant grade from ASTM B348 or B265.
Example-Grade 2 (CP Titanium):
|
Element |
Max wt% |
|
Fe |
0.3 |
|
O |
0.25 |
|
C |
0.08 |
|
N |
0.03 |
|
H |
0.015 |
|
Ti |
Balance |
7. Applications
ASTM B337 pipes are used in applications requiring high corrosion resistance, including:
Chemical processing plants (HCl, NaClO₃, bleach lines)
Desalination systems (brine piping)
Offshore oil/gas systems
Power plant condensers
Shipbuilding and marine structures
Heat recovery systems
8. Marking and Certification
Each pipe must be legibly marked with:
ASTM B337
Grade
Manufacturer
Heat number or lot
OD and wall thickness
Production method (Seamless or Welded)
Test reports are typically provided per EN 10204 3.1 or 3.2 requirements.
9. Related Specifications
ASTM B861-Seamless Pipe (same grades, smaller OD range)
ASTM B862-Welded Pipe (smaller OD/thickness, welded only)
ASTM B338-Seamless and Welded Tube (heat exchanger tube)
ASTM B265/B348-Base material (sheet/bar) for making pipe
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