Gr2 ASTM B338 Welded Titanium Tube Description

ASTM B338 is the spec for welded and seamless titanium tube used in condensers and heat exchangers. Gr2 ASTM B338 Welded Titanium Tube is Grade 2 material. Grade 2 is what most people use in these applications. It's strong enough. It welds without trouble. It doesn't pit in seawater. It doesn't rust. It just sits there and works.

Welded tube starts as strip. Rolled into a tube. Welded down the seam. Then the weld gets annealed so it's not brittle. For condenser work, welded tube does the same job as seamless. Costs less. That's why so many plants use it.

Seamless costs more because the process is slower. Tolerances are looser. For thin wall exchanger tubes, welded is often the better option. ASTM B338 requires the weld to be tested. Eddy current or ultrasonic. No defects allowed.

Characteristic of Gr2 ASTM B338 Welded Titanium Tube

Material specs (Grade 2)

Property	Value
Tensile (min)	345 MPa
Yield (min)	275 MPa
Elongation	20%
Density	4.51 g/cm³
Thermal conductivity	16.4 W/m·K
Max temp	300°C

Chemistry (Grade 2, max)

Element	%
Carbon	0.10
Iron	0.30
Oxygen	0.25
Nitrogen	0.03
Hydrogen	0.015
Titanium	Balance

Application of Gr2 ASTM B338 Welded Titanium Tube

Aerospace: Hydraulic pipelines, fuel pipelines, air conditioning systems-the dual requirements of lightweight design and high reliability make titanium welded pipes the preferred choice.

Petrochemicals: Heat exchanger tube bundles, acetic acid/chlor-alkali process pipelines-resistance to highly corrosive media plays a crucial role here.

Marine Engineering: Seawater cooling pipes, fire protection pipelines, platform structure pipes-resistance to seawater corrosion and ultra-long service life bring significant advantages in operation and maintenance.

Cryogenic Engineering: LNG transmission pipelines, liquid oxygen/liquid nitrogen transmission pipelines-excellent low-temperature toughness ensures safe operation under extreme conditions.

Biomedicine: Clean process pipelines, pipes for implantable device processing-biocompatibility and pollution-free surfaces are basic entry requirements.

Power Industry: Condenser tubes, cooler tubes-erosion resistance and resistance to sandy seawater ensure long-term stable operation.

Process of Gr2 ASTM B338 Welded Titanium Tube

Tube-to-tubesheet welding. Use ERTi-2 filler. Purge the tube with argon. Weld color tells you everything. Silver or light straw is good. Blue or purple means bad shielding. White or grey is contamination.

Roller expansion. Grade 2 work-hardens. Use controlled rolling pressure. Too light and the tube leaks. Too heavy and the tube end cracks.

U-bends. Mandrel bender. Grade 2 bends fine. Minimum radius depends on wall thickness.

Testing per ASTM B338

Every tube gets hydro tested. Samples from each lot get flattened and flared. The weld seam gets eddy current or ultrasonic inspection. Reports go with the shipment. Heat number traceable. EN 10204 3.1 standard. 3.2 if your spec asks for it.

FAQ

01.Welded or seamless for seawater?

Welded is standard. Most power plants use Gr2 ASTM B338 Welded Titanium Tube in seawater condensers. Works fine.

02.What wall thickness?

For titanium, no corrosion allowance. Design for pressure only. Typical condenser tube is 0.7mm to 0.9mm wall.

03.Does the weld corrode?

Not if it's done right. The seam is annealed. Weld zone matches the base metal.

04.Lead time?

Stock sizes 3-4 weeks. Non-stock 6-8 weeks.

05.Sample tube?

Yes. 500mm. Pay shipping. Tube is free.

Contact