GRADE GUIDE · GRADE 2
Titanium Grade 2 (UNS R50400) is the workhorse of commercially pure titanium: about 4,510 kg/m³ — 57% the density of steel — with a 275 MPa yield floor and effectively total immunity to seawater corrosion. Heat exchangers, desalination internals and chemical equipment are its natural territory.
Also listed as: UNS R50400 · EN 3.7035 · CP Titanium Gr.2 · ASTM B265 Gr.2
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Grade 2 wins the balance among the four CP titanium grades: stronger than Grades 1, more weldable and formable than the higher-oxygen Grade 4. Its oxide film makes it inert in seawater at any chloride level and temperature the Gulf can offer — plate heat exchangers, condenser tubing and desalination hardware specify it not for strength but because it simply does not corrode there.
It fabricates like a well-behaved stainless with two disciplines: dedicated clean tooling (iron contamination stains and pits it) and full inert-gas shielding when welding, since hot titanium gulps oxygen. Off-cuts — exchanger plate drops, tube ends, sheet remnants — carry serious value per kilogram, and surplus buying spares you titanium mill minimums.
It holds the middle: enough oxygen for useful strength, low enough for easy forming and welding. Grade 1 is softer for deep forming; Grade 4 stronger but stiffer to work. Most corrosion-driven designs land on 2.
Total inert-gas coverage — torch, trailing and back purge — because hot titanium embrittles on contact with air. With proper argon shielding, TIG welds in Grade 2 are routine; straw or blue weld colour means the shielding failed.
Titanium itself is safe, but it is strongly cathodic — carbon steel or aluminium coupled to it corrodes faster. Isolate joints or accept that the other metal becomes the anode.