Product Introduction

Grade 9 seamless titanium tube provides higher strength than commercially pure titanium while retaining practical formability and weldability.
The Ti-3Al-2.5V alloy supports thin-wall tube designs, helping reduce component weight while maintaining dimensional stability during forming and assembly.
Typical applications include bicycle frames, sports equipment, lightweight structures, and fabricated tubular components.
This is often a practical choice rather than a strength-driven one.

Product Parameter

Grade 9 seamless titanium tube is normally ordered by outside diameter, wall thickness, and required length.
Straightness, roundness, surface condition, end preparation, and testing requirements should be confirmed according to the final forming, welding, or assembly process.
The table below shows our general supply range. Non-standard dimensions can be reviewed based on drawings, quantity, and application requirements.

Item	Specification
Material Grade	Titanium Grade 9 (Ti-3Al-2.5V Alloy)
Standard	ASTM B338 / ASTM B861
Manufacturing Process	Extrusion → Cold Drawing → Intermediate Annealing → Final Sizing → Straightening → Surface Treatment
Diameter Range	Ø3.0 mm – Ø114 mm (Customized Available)
Length	Up to 6000 mm (cut-to-length or fixed length)
Wall Thickness	0.5 mm – 6 mm (depending on OD and process)
Surface Finish	Pickled / Bright Annealed / Precision Drawn
Mechanical Properties	Tensile Strength: ≥ 620 MPa, Yield Strength (0.2%): ≥ 483 MPa, Elongation: ≥ 15%
Chemical Composition	Al 2.5–3.5%, V 2.0–3.0%, Fe ≤ 0.30%, O ≤ 0.25%, C ≤ 0.08%, N ≤ 0.03%, H ≤ 0.015%, Ti balance
Testing	Hydrostatic Test, Ultrasonic Testing (UT), Chemical Composition Analysis (PMI), Mechanical Properties Test, Flare Test (Expanding Test), Flattening Test, Eddy Current Testing (ECT).
Common Applications	Bicycle Frames and Tubing, Sports Equipment Components, Lightweight Structural Tubes, Automotive Tubing and Fittings, Aerospace Tubular Components.

Quality Management

Quality inspection

Hydrostatic Test

Ultrasonic Testing (UT)

ChemicalCompositionAnalysis(PMI)

MechanicalPropertiesTest

Flaring Test / Flattening Test

EddyCurrentTesting(ECT)

For Grade 9 (Ti-3Al-2.5V) seamless titanium tubes, inspection is carried out with actual tube applications in mind. The focus is not only on appearance, but on how the tube performs during forming, pressure testing, and long-term use.
Wall thickness uniformity and internal surface condition are checked first, as these directly affect bending, welding, and pressure behavior. Ultrasonic and eddy current testing are used to screen for internal defects, while hydrostatic testing is applied to confirm pressure integrity. Chemical composition and basic mechanical properties are verified for each production batch before release.
These inspections are performed to reduce variation during fabrication and installation, rather than to meet laboratory targets alone. The aim is to supply Grade 9 tubes that remain stable in processing and behave consistently in service.

Common applications

Bicycle Frame Tubing

Grade 9 seamless titanium tubes are commonly used in bicycle frame structures.
The material supports thin-wall tube designs and remains workable during welding and alignment.
It is often used for main frame tubes and welded joints.

Sports Equipment Tubes

Grade 9 tubes are applied in sports equipment that uses formed or curved tubing.
The tubes can be bent and shaped with fewer forming issues than higher-strength alloys.
Typical parts include rackets, poles, and tubular sporting components.

Lightweight Structural Tubes

In lightweight structures, Grade 9 tubes are used where tubes carry moderate loads.
Applications include support frames, braces, and non-primary structural parts.
Corrosion resistance and dimensional control are usually the main considerations.

Packaging and transportation

Grade 9 seamless titanium tubes are handled with attention to wall thickness and tube straightness rather than surface appearance alone. Tubes intended for thin-wall or forming applications are separated individually to prevent contact deformation during handling and loading.
During packing, tubes are grouped by size and length, then secured to limit bending or local stress. Long-length tubes are supported along their length to maintain straightness, especially for tubes prepared for welding or frame fabrication. Protective sleeves or internal spacing are applied where necessary to avoid ovality caused by stacking.
Transportation arrangements are selected based on tube length and destination.

Why Choose Grade 9 Seamless Titanium Tubes

Higher Strength with Lower Weight

Grade 9 offers higher strength than commercially pure titanium while remaining more formable than higher-strength titanium alloys. It is well suited to thin-wall tubes and lightweight tubular assemblies.

Practical for Forming and Welding

Ti-3Al-2.5V tubing can be bent, welded, and assembled into frames, supports, and tubular components. Bend radius, tooling, and welding requirements should be confirmed for each design.

Dimensions Prepared for the Application

Outside diameter, wall thickness, and length can be supplied according to drawings or existing assemblies. Straightness, roundness, tolerance, and end preparation can also be specified.

Protected During Packing and Transport

Long and thin-wall tubes are separated, bundled, and supported to reduce bending, contact damage, and local deformation during handling and shipment.

FAQ

Q: Why do some projects move from Grade 2 to Grade 9 tubes?

A: Most changes happen when weight or fatigue becomes a concern.
Grade 2 works well for corrosion and stability, but in lightweight structures it can feel soft.

Grade 9 adds strength without making the tube stiff or difficult to form, which is why it is often chosen as a middle option.

Q: Are Grade 9 tubes normally supplied with thin walls?

A: Yes, thin wall is common rather than exceptional.
In many applications, wall thickness is reduced on purpose to allow bending, welding, or controlled flexibility.

Because of this, tube geometry matters more than nominal strength numbers.

Q: What should be expected during welding or frame assembly?

A: Grade 9 is generally easier to control than high-strength titanium alloys.
Heat input still matters, but distortion and alignment are usually more predictable, especially when multiple tubes are joined into a frame or structural assembly.

Q: How are thin-wall Grade 9 tubes protected during delivery?

A: Handling damage is a common issue with thin tubes.
For this reason, tubes are wrapped individually and supported inside foam-lined wooden crates to limit movement and contact until fabrication begins.