Light + strong. Cheap + strong. Pay for what matters.

For weight-critical applications: yes. Aerospace: specific strength advantage (187 vs 128) reduces total airframe weight proportionally to savings. For medical implants: titanium's biocompatibility is irreplaceable. For non-weight-critical applications: stainless usually adequate and 5-10× cheaper. Evaluate based on: what does weight savings provide value? If payload, fuel, performance, cost savings over product life matter, titanium premium often justified.

Titanium has: low thermal conductivity (heat concentrates at tool), work-hardening behavior, chemical reactivity with tool materials at cutting temperatures. Results: tool wear rapid, tool temperatures high. Solutions: sharp carbide tooling, slow cutting speeds (30-60 m/min vs 100+ for steel), high-pressure coolant, rigid setup. Machining time 2-3× stainless equivalent. This contributes to the cost premium beyond raw material.

Titanium forms stable TiO2 passive layer — nearly immune to saltwater, most acids, most alkalis. Exceptions: HF acid (dissolves Ti), reducing environments strip the oxide, red fuming nitric acid + methanol combinations can be corrosive. For 99% of industrial corrosion environments: titanium excellent. For aerospace and marine, unparalleled. Stainless can fail in chlorides (pitting); titanium does not.

Ti Gr.5 (ASTM F1472): general medical/dental. Ti Gr.23 / Ti-6Al-4V ELI (ASTM F136): extra-low interstitial for permanent implants — better fracture toughness. CP Ti (Grades 1-4, ASTM F67): commercially pure for bone ingrowth (implants). 316L stainless F138: medical-grade stainless for temporary implants (plates, screws). For permanent implants: titanium standard. For temporary fixation: 316L also used.

1-meter aluminum bracket: 500g in aluminum, 1800g in stainless, 1000g in titanium. Titanium saves 800g vs stainless. In aerospace: each kg of weight on aircraft saves ~$1000 in fuel over service life. So 800g savings = $800 fuel savings. If titanium bracket costs $500 more than stainless: net save $300, weight reduction enabled. For non-aerospace: weight savings rarely directly monetizable.

Ti Gr.2 (CP): commercially pure, corrosion applications (chemical, marine). Ti Gr.7: CP Ti with Pd addition — enhanced HCl resistance. Ti Gr.9: Ti-3Al-2.5V, lower cost than Gr.5, medical and aerospace. Ti Gr.12: economical alloy for corrosion service. Ti Gr.23 (ELI): implantable grade. Each has specific applications — Gr.5 dominates aerospace, Gr.2 dominates chemical corrosion, Gr.23 dominates implantable medical.