Titanium Grade 1 and Grade 2 are both commercially pure titanium (CP Ti) with nearly identical density, as their chemical compositions differ only slightly in impurity content (primarily oxygen) which has a negligible impact on density:
Key Note: The density of both grades remains consistent across typical operating temperatures (up to 300°C/572°F) with minimal thermal expansion effects on mass per unit volume. This makes them ideal for weight-sensitive applications where consistent material density is critical.
Thermal conductivity of CP Ti is influenced by impurity content (notably oxygen), resulting in slightly lower conductivity for Grade 2 due to its higher oxygen level. Below are the standard thermal conductivity values at key temperatures:
Key Explanation: Grade 1, with lower oxygen content (≤0.18%), has fewer lattice defects that impede heat transfer, leading to marginally higher thermal conductivity than Grade 2 (oxygen content ≤0.25%). Both grades exhibit low thermal conductivity compared to metals like aluminum or copper, making them suitable for applications requiring thermal insulation or controlled heat dissipation.
Electrical conductivity of CP Ti is inversely related to impurity content, with Grade 1 demonstrating slightly better conductivity due to its purer composition. Electrical performance is typically quantified by conductivity (as a percentage of the International Annealed Copper Standard, IACS) or resistivity:
Key Explanation:
IACS conductivity: Both grades have low electrical conductivity (≈3% IACS), meaning they are poor electrical conductors compared to copper (100% IACS) or aluminum (61% IACS). Grade 1's lower impurity content reduces electron scattering, resulting in slightly higher conductivity than Grade 2.
Practical implication: Their low electrical conductivity makes them suitable for applications where electrical insulation is desired (e.g., corrosion-resistant fasteners in electrical equipment, non-conductive structural components).
Density: Consistent 4.507 g/cm³ for both grades-lightweight advantage for aerospace, marine, and medical industries.
Thermal Conductivity: Low and stable, with Grade 1 marginally higher (17.0 W/(m·K) at 25°C) than Grade 2 (16.5 W/(m·K))-ideal for thermal management in high-temperature or corrosive environments.
Electrical Conductivity: Poor conductivity (2.9–3.1% IACS) for both grades-suitable for non-conductive or low-conductivity requirements.
