① GB/T3624 (Titanium and titanium alloy tube national standard)
GB/T3625(National standards for titanium and titanium alloy tubes for heat exchangers and condensers)
② ASTM B337(Seamless Welding Titanium and Titanium Alloy Pipe American Standard)
ASTM B338 (Seamless welded titanium and titanium alloy tubes for heat exchangers and condensers)
ASTM B861 (Seamless Titanium and Titanium Alloy Pipe American Standard)
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