Comprehensive Analysis of TTi3.0-0.2 Titanium Copper / C19910 / QTi3.0-0.2 Titanium Bronze Strip

I. Grade Correspondences

TTi3.0-0.2: Chinese national standard titanium copper alloy grade, with approximately 3.0% titanium content and less than 0.2% phosphorus content, belonging to high-strength, high-conductivity copper-based materials.

C19910: American standard (ASTM) titanium copper alloy grade, corresponding to Japanese standard NKT322 and Chinese national standard TTi3.0-0.2, mainly used for precision electronic components and high-load industrial applications.

QTi3.0-0.2: Domestic titanium bronze grade, with the same composition as TTi3.0-0.2, complying with standard GB/T 5231-2012.

II. Chemical Composition

Copper (Cu): ≥95% (matrix element, ensuring conductivity and workability).

Titanium (Ti): 2.8-3.2%, enhancing strength, heat resistance, and creep resistance.

Phosphorus (P): 0.15-0.25%, improving machinability and corrosion resistance.

Other elements: Iron (Fe) ≤0.1%, total impurities ≤0.5%.

III. Physical Properties

Density: 8.82-8.90 g/cm3 (close to pure copper).

Electrical conductivity: 85% IACS (superior to ordinary bronze, close to pure copper's 90% IACS).

Thermal conductivity: 320 W/(m·K), suitable for heat dissipation components.

Elastic modulus: 125 GPa (high rigidity, strong resistance to deformation).

IV. Mechanical and Processing Properties

Mechanical Properties

Tensile strength: 600-750 MPa (hard state), approximately 450 MPa in annealed state.

Elongation: 5-8% (hard state), up to 15% in annealed state.

Hardness: 200-250 HV (processed state), approximately 150 HV in annealed state.

Processing Characteristics

Cold workability: Excellent, suitable for precision forming processes such as stamping and bending.

Weldability: Requires protective gas welding (e.g., TIG welding) to avoid high-temperature oxidation.

V. Core Application Areas

Electronics and Electrical

Integrated circuit lead frames, BGA substrates, high-frequency connectors (requiring high conductivity and fatigue resistance).

Industrial Equipment

Heat exchanger tubes, condenser fins (corrosion-resistant, resistant to high-temperature softening up to 500°C).

Automotive and Aerospace

Fuel injector needle valves, turbine blade fasteners (impact-resistant and capable of withstanding complex thermal cycles).