GR9 Titanium Alloy Tube Purchase Guide

I. Selection of GR9 Key Parameters

Specification Matching

Outer Diameter and Wall Thickness: Common outer diameter range is 16-150mm, wall thickness is 0.5-7mm, and thin-walled or thick-walled tubes need to be selected according to pressure requirements.

Length: Standard tubes ≤6000mm, customized requirements need to be communicated in advance.

Delivery Status: Annealed state (M) is suitable for subsequent processing; cold-processed state (Y) can be directly used for finished products.

Performance Index

Strength: Tensile strength is about 600MPa, higher than pure titanium but lower than TC4.

Heat Resistance: Long-term use temperature ≤315℃, short-term tolerance of 450℃.

Density: 4.47g/cm³, 40% lighter than steel. Gr9 Ti3Al2.5V Titanium Tube / Thin Wall Titanium Tube / titanium exhaust pipe

2. Application scenario matching

Aerospace

Seamless pipes are preferred to ensure the high-pressure sealing of hydraulic/fuel pipelines. Cold-drawn pipes with an outer diameter of ≤65mm and a wall thickness of ≥1.5mm are recommended.

Bicycle/sports equipment

For lightweight scenes such as trekking poles and frames, seamless pipes with an outer diameter of 16-25mm and a wall thickness of 0.8-1.2mm are selected. Note that the welds need to be polished to be smooth and crack-free.

Chemical equipment

Annealed pipes are recommended for acid and alkali corrosion resistant scenes, and the surface needs to be polished to reduce the risk of medium adhesion.

3. Processing and process verification

Welding quality

TiG welding should be used for welding, and the weld width should be ≤2mm to avoid pores and unfused defects.

For high-end frames, closed welding process is recommended to reduce the risk of open welding.

Surface treatment

Chemical pipes need to be electrolytically polished, with a roughness Ra≤0.8μm; sports equipment can retain the frosted or sandblasted texture.

4. Comparison with TC4 titanium alloy

Advantages: GR9 has better cold formability and is suitable for complex bending parts.

Disadvantages: The strength is only 60%-70% of TC4, and the high temperature performance is weak, which is not suitable for scenes above 500℃.