Ti-10V-2Fe-3Al (TB6, Gr22)

1. Exceptional strength and specific strength (core advantage): Tensile strength in solution-treated and aged condition is ≥ 1170 MPa (exceeding 1400 MPa under certain conditions), significantly higher than Gr5 (TC4). Its specific strength (≈ 250 kN·m/kg) far surpasses that of stainless steels and most nickel-based alloys.
2. Excellent fracture toughness and fatigue resistance: K_IC can reach 40-60 MPa·√m, with superior ability to resist fatigue crack propagation.
3. Superior hardenability: It can be fully hardened in sections up to Φ150mm, making it an ideal material for large fasteners, landing gear components, and heavy structural parts.
4. Good forging performance: The flowability during β-phase forging is better than Gr5, enabling the production of complex-shaped forgings and reducing machining requirements.
5. Good cold working performance: Cold drawing, cold rolling, cold bending, cold heading, and other cold working processes can be performed in the solution-treated state, with cold working performance superior to Gr5.
6. Compliance with multiple international standards: ASTM B348, ASTM F136 (medical), ISO 5832-3, AMS 4957, GB/T 2965, etc.

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Continuous operating temperature (primarily in terms of strength and thermal stability): It is recommended to be ≤ 300°C, at which temperature the microstructure remains stable and performance degradation is controllable.
Short-term exposure temperature: up to 400°C, but strength and toughness will decrease.
Maximum design temperature for pressure-bearing components: Typically considered as 250-300°C, and performance verification is required based on specific stress levels.
High-Temperature Limitations: TB6 is a metastable β-type titanium alloy. Prolonged exposure at 300-400°C may result in α-phase precipitation, leading to embrittlement, and thus it is not recommended for long-term use in this temperature range. For long-term service at higher temperatures, TA15 (≤ 500°C) or Gr5 (≤ 400°C) are recommended alternatives.

The excellent hardenability of TB6 mainly stems from its high content of β-stabilizing elements (V 10%, Fe 2%):
1. High content of β-phase stabilizing elements: 10% vanadium and 2% iron significantly lower the β→α phase transformation temperature and delay the kinetics of the phase transformation, allowing the alloy to fully retain the metastable β phase during air cooling or oil quenching.
2. Extremely high hardenability: The hardenability of TB6 is far superior to that of Gr5 (TC4). It can be fully hardened on a Φ150mm cross-section, resulting in uniform mechanical properties. In contrast, Gr5 achieves full hardening only up to approximately a Φ50mm cross-section.
3. Engineering significance: This enables TB6 to be used for manufacturing large-sized high-strength forgings, large aircraft landing gear components, and heavy-duty fasteners. Gr5, however, is limited by its hardenability, leading to poor performance uniformity in large cross-section applications.

The excellent forging performance of TB6 mainly stems from its β-phase microstructure characteristics and high vanadium content:
1. Excellent β-phase fluidity: TB6 exhibits superior fluidity in the β-phase region, enabling it to fill complex mold cavities and produce near-net-shape forgings, significantly reducing subsequent machining requirements and lowering manufacturing costs.
2. Lower deformation resistance: The deformation resistance of TB6 during β-phase forging is lower than that of Gr5, allowing for greater deformation in a single heating cycle and improving production efficiency.
3. Wide hot working window: Forging can be performed within the 800-1050°C range, offering a broad process window and relatively low equipment requirements.
4. Typical applications: TB6 is the designated material for landing gear and landing gear components of the Airbus A380 and Boeing 777. Its excellent forging performance and hardenability are key selection criteria.

The welding performance of TB6 is generally average and requires strict adherence to the welding process specifications for β-titanium alloys:
1. Recommended welding methods: TIG (Tungsten Inert Gas welding), Electron Beam Welding, Laser Welding, and Resistance Welding.
2. Pre-welding preparation: The welding area must be strictly cleaned to remove oil, scale, and moisture.
3. Protective gas: High-purity argon gas (≥ 99.99%) should be used for welding and backside protection to prevent high-temperature oxidation contamination. TB6 is more sensitive to gas contamination than α+β titanium alloys.
4. Post-weld treatment: It is recommended to perform post-weld solution treatment (approximately 760-790°C, water quenching) and aging treatment to restore the strength and toughness of the β microstructure.
5. Filler metal: TB6 matching filler wire or compatible welding wire is recommended to ensure weld performance compatibility.
6. Key precautions: Brittle α phase precipitation may occur in the TB6 welding heat-affected zone. It is recommended to strictly control the heat input (linear energy) and perform complete heat treatment after welding.

It can partially replace, especially in working conditions with high strength, high toughness, and large cross-section requirements:
Scenarios suitable for substitution (TB6 has obvious advantages):
Aircraft Landing Gear Components:
TB6 is the designated material for landing gears of Airbus A380 and Boeing 777, offering significantly higher strength and toughness than Gr5.
Ultra-High-Strength Fasteners:
TB6 exhibits strength over 1.3 times that of Gr5, making it suitable for fasteners with higher load requirements.
Large-Sized Structural Parts (>Φ50mm):
TB6 has far superior hardenability than Gr5, making it applicable to large-sized components.
Complexly Shaped Forgings:
TB6's better forging fluidity than Gr5 reduces machining volume and lowers costs.
High-Stress Springs:
TB6's strength level makes it an ideal material for high-performance springs.

Scenarios where it is not suitable as a substitute (Gr5 remains the better choice):
High-temperature components for long-term service above 400°C:
The long-term operating temperature of Gr5 (≤ 400°C) is superior to that of TB6 (≤ 300°C).
Complex welded structural parts:
Gr5 has better weldability than TB6, and its post-weld heat treatment process is more mature.
Cost-sensitive projects:
TB6 has a higher cost than Gr5 due to its multiple alloying elements (10% V) and complex processing.
Thin-walled tube materials and precision cold-worked parts:
Gr9's cold working performance is far superior to that of TB6.
Global supply chain universality requirements:
Gr5 (TC4) is the most widely used titanium alloy worldwide, with more abundant procurement and processing resources.

Material Selection Recommendations: Please provide detailed operating conditions (temperature range, load type, cross-sectional dimensions, forging/ welding requirements, medium environment, service life) for specific material selection. We can assist with technical and economic comparative analysis to help you make the optimal choice between TB6 and other titanium alloy grades.

For quotations on specific specifications, material test reports, or technical parameter sheets, please contact our sales engineers. We support customizing dimensions, heat treatment conditions, and surface treatments as required, and provide a full set of internationally certified documents.