ASTM B861-Seamless Titanium and Titanium Alloy Pipe

Standard Specification for Titanium and Titanium Alloy Seamless Pipe

Scope:

ASTM B861 covers seamless titanium and titanium alloy pipe intended for general corrosion-resistant and high-strength applications, including:

Chemical processing

Power generation

Oil & gas piping

Industrial piping systems

Structural and pressure-bearing systems

This specification is different from ASTM B338, which is mainly for tubes used in heat exchangers and condensers.

Applicable Grades (UNS Designations)

This standard includes both commercially pure titanium and titanium alloys:

Dimensions and Size Range

OD Tolerances (from ASTM B861 Table 2):

Wall Thickness Tolerance:

±12.5% of nominal wall thickness (unless otherwise specified).

Length Tolerance:

Specified Length:±3.2 mm (±1/8 inch)

Random Length: As agreed between buyer and supplier

Mechanical Properties (Annealed Condition)

Typical minimum values (varies by grade):

Testing Requirements

Chemical Composition: Must conform to applicable ASTM grade (e.g., ASTM B348)

Mechanical Testing: Tensile, elongation

Hydrostatic or Air Pressure Test: Required on each pipe (or as agreed)

Non-Destructive Testing (NDT): As specified by purchaser or for critical applications

Flattening / Flaring Test: May be required based on size and end use

Marking & Certification

Each pipe must be marked with:

Manufacturer's name or logo

ASTM B861

Grade

Condition (e.g., annealed)

Heat/lot number

Size and schedule

Material Test Reports (MTRs) must be provided, including full:

Chemical analysis

Mechanical properties

NDT / hydro test results