Overview
Pure titanium is a lustrous transition metal valued for its exceptional strength, low density, and resistance to corrosion. It occurs naturally in minerals like ilmenite and rutile and is extracted via the Kroll process. Commercially pure titanium (Grades 1-4) contains 99.0-99.9% titanium, with varying oxygen content affecting mechanical properties. Unlike alloys, pure titanium maintains superior corrosion resistance but has lower strength than titanium alloys like Ti-6Al-4V. Its biocompatibility makes it indispensable for medical applications, while its performance in harsh environments suits industrial uses.
Physical and Chemical Properties
Pure titanium's density (4.506 g/cm³) is about 60% of steel's, offering significant weight savings. It retains strength up to 430°C and exhibits a hexagonal close-packed (HCP) crystal structure at room temperature, transitioning to body-centered cubic (BCC) above 882°C. Chemically, it forms a passive oxide layer (TiO₂) that resists corrosion from seawater, chlorides, and oxidizing acids. This layer self-repairs when damaged, ensuring durability. Titanium is paramagnetic and has low thermal conductivity (21.9 W/m·K), requiring specialized machining techniques.
Main Applications
In aerospace, pure titanium grades are used for airframe components and engine parts where corrosion resistance outweighs strength needs. Grade 2 is common in heat exchangers, piping, and desalination plants due to its seawater resistance. The medical field relies on Grades 1 and 2 for dental implants, surgical tools, and joint replacements. Its non-toxicity and osseointegration properties are unmatched. Emerging applications include consumer electronics (watch cases, laptops) and architectural cladding for its aesthetic appeal.
Safety and Storage
Titanium poses minimal risk in solid form but requires precautions during processing. Grinding or welding generates fine dust or fumes that may irritate lungs—use local exhaust ventilation and NIOSH-approved respirators. Store away from strong oxidizers (e.g., nitrates) to prevent fire risks. Bulk material should be kept dry to avoid surface contamination. For medical-grade titanium, sterilization protocols (autoclaving, gamma irradiation) must be followed to maintain biocompatibility.
B2B Procurement Guide
Specify ASTM grades: Grade 1 (softest, highest ductility), Grade 4 (strongest unalloyed). Mill test reports should verify composition, especially oxygen (0.18-0.40% across grades). Common forms include sheets (0.5-10mm thickness), rods (5-200mm diameter), and wires. Lead times can extend to 8-12 weeks for custom sizes. For cost-sensitive projects, consider recycled titanium, which retains properties but costs 15-30% less. Always audit suppliers for ISO 9001 or AS9100 certification in critical applications.
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