GR9 Titanium Alloy Tube Selection Guide

Release time：2025-04-07 11:49:56 丨 Number of visits：

1、 Key parameter selection

Specification matching

Outer diameter and wall thickness: The common outer diameter range is 16-150mm, and the wall thickness is 0.5-7mm. Thin wall or thick wall pipes should be selected according to pressure requirements.

Length: Standard pipe ≤ 6000mm, customization requirements need to be communicated in advance.

Delivery status: annealed state (M) suitable for subsequent processing; Cold working state (Y) can be directly used for finished products.

Performance indicators

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

Temperature resistance: Long term use temperature ≤ 315 ℃, short-term tolerance up to 450 ℃.

Density: 4.47g/cm ³, 40% lighter than steel.

2、 Application scenario matching

Aerospace

Priority should be given to seamless pipes to ensure 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 scenarios such as hiking poles and frames, seamless pipes with an outer diameter of 16-25mm and a wall thickness of 0.8-1.2mm should be selected, and attention should be paid to polishing the welds to a smooth and crack free surface.

Chemical equipment

It is recommended to choose annealed pipes for acid and alkali corrosion scenarios, and the surface needs to be polished to reduce the risk of medium adhesion.

3、 Supplier Qualification Verification

Certification standards

Prioritize selecting suppliers that comply with ASTM B337 and GB/T3624.

4、 Processing and process validation

Welding quality

TIG welding should be used for welding, with a weld width of ≤ 2mm to avoid porosity and incomplete fusion defects.

It is recommended to choose a closed welding process for high-end frames to reduce the risk of welding failure.

Surface treatment

Chemical pipes require electrolytic polishing with a roughness Ra ≤ 0.8 μ m; Sports equipment can retain a frosted or sandblasted texture.

5、 Compare TC4 titanium alloy

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

Disadvantage: The strength is only 60% -70% of TC4, and the high-temperature performance is weak, making it unsuitable for scenarios above 500 ℃.

6、 Price and Procurement Suggestions

Reference price: 86-198 yuan/kg, annealed state is about 15% -20% lower than cold processed state.

Batch discount: Starting from 10kg, discounts can be negotiated for purchases over 100kg.

7、 Precautions

Regularly inspect the welding points of sports equipment and immediately stop using it if cracks are found.

Require suppliers to provide material certification and third-party testing reports.

In the medical field, it is necessary to ensure that the storage materials are non-magnetic and have biocompatibility standards.