Seawater & high salt spray / chloride-rich environment
316L stainless steel still suffers from pitting and crevice corrosion under long-term exposure to seawater, brine and coastal atmosphere. Applications: yachts, marine facilities, seawater desalination plants, offshore platforms, brine pipelines, electrochemical equipment. Recommended material: Grade 2 pure titanium.
Lightweight structural requirements
Titanium weighs only ~60% of stainless steel at equivalent strength, achieving weight reduction without sacrificing corrosion resistance. Applications: aerospace, racing vehicles, UAVs, high-end sports equipment, motorcycle refitting. Recommended material: Grade 5 Ti-6Al-4V titanium alloy.
Non-magnetic application requirements
Austenitic stainless steel carries weak magnetism, while titanium is completely non-magnetic. Applications: MRI supporting equipment, precision electronic instruments, magnetic detection devices.
Medical & human-contact equipment
Stainless steel may release nickel ions. Titanium features outstanding biocompatibility. Applications: medical instruments, rehabilitation equipment; implant use selects Grade 23 (TC4 ELI).
Organic acid & mild chemical anti-corrosion conditions
Titanium maintains a stable passive film in nitric acid and organic acid environments where stainless steel corrodes easily. Applications: pharmaceutical equipment, fine chemical machinery, anti-corrosion wastewater treatment facilities.
Long-term service under moderate temperature (≤300℃)
Stainless steel loses strength and oxidizes easily under sustained elevated temperature. Titanium offers superior thermal stability. Applications: high-performance engine peripheral fasteners.
Notes
Titanium is NOT suitable for environments containing hydrofluoric acid or concentrated hot hydrochloric acid. For dry indoor ordinary working conditions, stainless steel is more cost-effective.
