ASTM B861 Grade 2 UNS R50400 Titanium Alloy Seamless Pipe
ASTM B861 Grade 2 titanium alloy seamless pipe is made of industrial pure titanium, which combines excellent corrosion resistance, medium strength and good ductility. Its seamless structure is achieved by extrusion or rolling process, without the risk of weld defects, and is suitable for high pressure and harsh environments.
This material has excellent resistance to seawater, chlorides, various acids and alkalis, and is low in density (high strength to weight ratio), non-magnetic and biocompatible.
Typical applications include chemical pipelines, offshore platform systems, seawater desalination equipment and heat exchangers. It is the preferred material for corrosive conditions requiring long life and high reliability, but attention should be paid to the high cost and galvanic corrosion protection when connected with other metals.
Chemical Composition of ASTM B861 Grade 2 Titanium Seamless Pipes
| Element | Chemical Composition % |
| Grade 1 | Grade 2 | Grade 3 | Grade 5 | Grade 7 | Grade 9 | Grade 11 | Grade 12 | Grade 23 |
| Nitrogen, max | 0.03 | 0.03 | 0.05 | 0.05 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 |
| Carbon, max | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 |
| Hydrogen, max | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.0125 |
| Iron, max | 0.20 | 0.30 | 0.30 | 0.40 | 0.30 | 0.25 | 0.20 | 0.30 | 0.25 |
| Oxygen, max | 0.18 | 0.25 | 0.35 | 0.20 | 0.25 | 0.15 | 0.18 | 0.25 | 0.13 |
| Aluminum | … | … | … | 5.5-6.75 | … | 2.5-3.5 | … | … | 5.5-6.5 |
| Vanadium | … | … | … | 3.5-4.5 | … | 2.0-3.0 | … | … | 3.5-4.5 |
| Tin | … | … | … | … | … | … | … | … | … |
| Ruthenium | … | … | … | … | … | … | … | … | … |
| Palladium | … | … | … | … | 0.12-0.25 | … | 0.12-0.25 | … | … |
| Molybdenum | … | … | … | … | … | … | … | 0.2-0.4 | … |
| Chromium | … | … | … | … | … | … | … | … | … |
| Nickel | … | … | … | … | … | … | … | 0.6-0.9 | … |
| Niobium | … | … | … | … | … | … | … | … | … |
| Ziconium | … | … | … | … | … | … | … | … | … |
| Silicon | … | … | … | … | … | … | … | … | … |
| Residuals, max each | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Residuals, max total | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Titanium | balance | balance | balance | balance | balance | balance | balance | balance | balance |
ASTM B861 Grade 2 Tensile Strength of Titanium Seamless Pipes
| Grade | Tensile Strength, min | Yield Strength (0.2% Offset) | Elongation 2 in. or 50 mm |
| | min | max |
| Ksi | (Mpa) | Ksi | (Mpa) | Ksi | (Mpa) | gage length min % | |
| Grade 1 | 35 | (240) | 25 | (170) | 45 | (310) | 24 |
| Grade 2 | 50 | (345) | 40 | (275) | 65 | (450) | 20 |
| Grade 3 | 65 | (450) | 55 | (380) | 80 | (550) | 18 |
| Grade 5 | 130 | (895) | 120 | (828) | … | … | 10 |
| Grade 7 | 50 | (345) | 40 | (275) | 65 | (450) | 20 |
| Grade 9 | 90 | (620) | 70 | (483) | 45 | … | 15 |
| Grade 11 | 35 | (240) | 25 | (170) | … | (310) | 24 |
| Grade 12 | 70 | (483) | 50 | (345) | … | … | 18 |
| Grade 23 | 120 | (828) | 110 | (759) | … | … | 10 |
Application
Chemical and petrochemical
Process pipelines, reactors, and heat exchanger pipelines for transporting highly corrosive media (such as chloride ions, acidic solutions, and organic acids).
Replace stainless steel in high-temperature and high-chlorine environments where pitting/stress corrosion is prone to occur, significantly extending the life of the equipment.
Marine engineering and ships
Seawater cooling system pipelines, submarine oil and gas pipelines, and drilling platform high-pressure manifolds.
Resist seawater corrosion and biological attachment, reduce maintenance costs, and are suitable for occasions with long service cycles.
Energy and environmental protection
Evaporator tubes and brine heater pipes in seawater desalination devices
Flue gas desulfurization (FGD) system spray pipes, chimney linings
High-end industrial systems
Aviation hydraulic pipelines, aerospace fuel pipelines
Pharmaceutical/bioengineering clean pipelines
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ASTM B861 Grade 2 UNS R50400 Titanium Alloy Seamless Pipe For Seawater Condenser Images
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