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Product Introduction
ASTM B862 is a well‑established international standard that covers welded titanium and titanium alloy pipes for corrosive, high‑temperature, or pressure‑related applications. It includes a range of titanium grades and is often used alongside its seamless counterpart, ASTM B861. You'll commonly see it specified in chemical processing, marine engineering, and energy systems.
Key Grade Of Titanium Welded Pipe ASTM B862
CP Titanium: Grade 1 (R50250), Grade 2 (R50400), Grade 3, Grade 4
Titanium alloy tube: Grade 5 (Ti-6Al-4V), Grade 23 (Ti-6Al-4V ELI), Grade 7, 9, 12.
Manufacturing & Quality Control
- Raw material: Starts with titanium plate or coil that meets ASTM B265.
- Welding process: Typically ERW or TIG, with full penetration at the weld seam. Post‑weld annealing (600–750 °C) is required to relieve residual stress and ensure consistent properties.
- Inspection:
- NDT: 100% eddy current for surface defects, plus ultrasonic testing for internal weld integrity. Pressure‑bearing pipes also go through hydrostatic testing.
- Mechanical tests: Tensile, flattening, and bend tests to confirm weld ductility.
- Surface finish: Pickled to remove oxide scale and spatter. The finished surface is free of cracks, pits, or incomplete welds.
Typical Applications
- Chemical & petrochemical: Piping for corrosive media (acids, alkalis, salts), reactors, and heat exchangers.
- Marine engineering: Seawater desalination lines, cooling systems for offshore platforms.
- Energy sector: Auxiliary piping in nuclear plants, geothermal energy transfer lines.
- General industry: Low‑pressure corrosive fluid transport, exhaust systems for pollution control equipment.
How It Compares to Similar Standards
|
Comparison Item |
ASTM B862 (Welded Pipe) |
ASTM B861 (Seamless Pipe) |
ASTM B338 (Seamless/Welded Tube) |
|
Product Type |
titanium welded tubes |
Seamless pipe |
Seamless/welded tube |
|
Diameter Range |
Small to large (up to 1200mm) |
Medium to small (up to 219mm) |
Small to medium (up to 200mm) |
|
Main Application |
Low-medium pressure large-diameter pipelines |
High-pressure primary pipelines |
Heat exchangers, instrumentation tubes |
|
Cost Performance |
High (lower production cost) |
Low (higher cost, better pressure resistance) |
Medium (high precision, thin wall) |
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