Titanium sheet

Abstract

Provided are a titanium sheet which combines strength with formability and a plate for plate heat exchangers which was obtained from the titanium sheet. The titanium sheet has a crystal grain structure which comprises an α phase, and is characterized by containing 0.020-0.150 mass % Fe, 0.020-0.150 mass % O, and 0.002-0.100 mass % C, with the remainder comprising titanium and unavoidable impurities. The sheet is further characterized in that the sum of the contents (mass %) of the Fe and the C is at least 0.80 times the content (mass %) of the O and the concentration of C in the grain boundaries is 1.0 mass % or higher.

1 . A titanium sheet comprising a grain microstructure of alpha phase, the titanium sheet comprising:
 iron (Fe) in a content of 0.020 to 0.150 mass percent;   oxygen (O) in a content of 0.020 to 0.150 mass percent;   carbon (C) in a content of 0.002 to 0.100 mass percent; and   titanium and inevitable impurities,   wherein:   a total content (in mass percent) of the iron and the carbon is equal to or more than 0.80 times a content (in mass percent) of the oxygen; and   a carbon concentration at grain boundaries is 1.0 mass percent or more.   
     
     
         2 . The titanium sheet according to  claim 1 , wherein the titanium sheet has an average grain size of 5 to 80 μm. 
     
     
         3 . The titanium sheet according to  claim 1 , wherein the titanium sheet is formed into a plate in a heat exchanger.