ASTM B861 GR.2 Titanium Alloy Pipe Seamless Heat Exchanger Application

The ASTM B861 specification covers the requirements for 34 grades of titanium and titanium alloy seamless pipe intended for general corrosion resisting and elevated temperature service. Produced through processes such as hot extrusion, hot rolling, or cold drawing to ensure that the pipe body has no welds and uniform overall performance. ASTM B861 GR.2 is typically supplied in an annealed state to achieve optimal plasticity, toughness, and corrosion resistance, facilitating subsequent bending, welding, and processing. It may also provide a cold working state with higher strength and slightly lower plasticity.

ASTM B861 Chemical Composition Requirements (%)

What are the core characteristics and advantages of ASTM B861 GR.2 Titanium Alloy Pipe?

• Excellent Corrosion Resistance: ASTM B861 GR.2 titanium alloy pipe can form a stable and dense titanium oxide (TiO2) protective film in oxidizing environments such as seawater, salt water, wet chlorine, hypochlorite, nitric acid, chromic acid, etc., which protects the tube from corrosion. At the same time, its corrosion resistance in chloride ion environments is much better than stainless steel, and its sensitivity to crevice corrosion is also higher than GR.7, GR.12 and other higher alloyed titanium materials.
• Good Mechanical Properties & Fabricability: The strength of ASTM B861 GR.2 titanium alloy pipe belongs to the medium strength grade of industrial pure titanium, which is stronger than Gr. 1 and weaker than Gr. 3. It is enough to meet the needs of many chemical and marine engineering applications, while maintaining good plasticity and high elongation, usually greater than or equal to 20%, and is easy to form by cold bending, flaring, flanging and other forming processes. However, due to the low thermal conductivity, low elasticity and stickiness of ASTM B861 GR.2, it is necessary to select appropriate cutting tools and cutting parameters.
• Good Biocompatibility: ASTM B861 Gr. 2 pure titanium is one of the most biocompatible metal materials and is widely used in human implants such as bone screws, bone plates, joint components, and medical devices such as surgical instruments and diagnostic equipment components. However, when used as an implant, it usually needs to meet more stringent special standards, such as ASTM F67.

What are the nondestructive testing requirements for ASTM B861 GR.2 Titanium Alloy Pipe?

The ASTM B861 GR.2 titanium alloy pipe should be subjected to a hydrostatic test or a nondestructive electric test (usually referred to as an eddy current test). At the same time, according to customer requirements, more stringent tests can be provided, such as Ultrasonic Testing (UT), which is used to detect longitudinal and transverse defects, cracks, inclusions, folds, etc. According to ASTM E213 standards, with high sensitivity; Eddy Current Testing (ET), which is mainly used to detect surface and near-surface defects according to ASTM E426/E426M standards.

ASTM B861 GR.7 Titanium Alloy Steel Heat Exchanger Pipe Application Area

• Chemical & Petrochemical: heat exchangers (tube/shell), condensers, reactors, containers, pipeline systems for transporting corrosive media such as chlor-alkali, nitric acid, and organic chlorides.
  
• Marine Engineering & Desalination: seawater cooling system pipelines, seawater desalination equipment, ship pipeline systems, offshore platform structures and pipelines.
• Power Generation: power station condenser tubes, flue gas desulfurization (FGD) system components, geothermal system pipelines.
• Aerospace: hydraulic system pipelines, engine nacelles, environmental control system pipelines.
• Medical & Pharmaceutical: medical devices, pharmaceutical equipment pipelines.