Titanium alloy material excellent in scale deposition inhibiting property and formability and a method of producing the same, as well as a heat exchanger or a seawater evaporator

Abstract

The titanium alloy material of the invention is excellent in a deposition inhibiting property of scales mainly comprising calcium carbonate contained in water and exhibits an excellent formability during manufacture of a heat exchanger or the like. The titanium alloy material of the invention contains P in an amount of 0.005 to 0.30% (mass % here and hereinafter) and Sn in an amount of 0.01 to 3.0%, with the balance of Ti and unavoidable impurities. Further, in a case where the titanium alloy material contains one or more elements selected from the group consisting of Cu, Fe, and Ni, they may satisfy the following formula (1): Cu+4.9Fe+1.3Ni+0.5Sn≦1.6  (1) in which Cu, Fe, Ni and Sn each represent the content (mass %) of the respective elements in the titanium alloy in the formula (1).

1 . A titanium alloy material comprising:
 Ti,   P in an amount of 0.005 to 0.30 mass %, and   Sn in an amount of 0.01 to 3.0 mass %.   
     
     
         2 . The titanium alloy material according to  claim 1 , further comprising one or more elements selected from the group consisting of Cu, Fe, and Ni and satisfying formula (1):
   Cu+4.9Fe+1.3Ni+0.5Sn≦1.6  (1)
   
       in which Cu, Fe, Ni and Sn in formula (1) each represent a content in mass % of the respective elements in the titanium alloy. 
     
     
         3 . The titanium alloy material according to  claim 1 , further comprising 0.3 mass % or less of Cu. 
     
     
         4 . The titanium alloy material according to  claim 1 , having an average crystal grain size of 10 μm or more. 
     
     
         5 . The titanium alloy material according to  claim 1 , which is suitable for use in a heat exchanger or a seawater evaporator. 
     
     
         6 . A heat exchanger or a seawater evaporator comprising the titanium alloy material according to  claim 1  in a heat transfer portion where water or seawater is caused to flow as a thermal medium. 
     
     
         7 . A method of producing the titanium alloy material according to  claim 1 , wherein
 a compound comprising, as a P source, at least one mother alloy selected from the group consisting of Sn—P mother alloy, Cu—P mother alloy, Fe—P mother alloy, Ni—P mother alloy, and Ti—P mother alloy is used for the starting material.   
     
     
         8 . A method of producing the titanium alloy material according to  claim 1 , the method comprising:
 melting and casting a melting material and then performing at least hot working in which a P-comprising compound is melted together with titanium as the melting material.   
     
     
         9 . A method of producing the titanium alloy material according to  claim 1 , the method comprising:
 melting and casting a melting material and then performing at least hot working including bloom forging or bloom rolling in which a heating temperature of the bloom forging or bloom rolling is 890° C. or higher.   
     
     
         10 . A method of producing the titanium alloy material according to  claim 1  the method comprising:
 melting and casting a melting material and then performing at least hot working, including: 
 heat treating the titanium alloy material until an average crystal grain size increases to 10 μm or more after further performing cold rolling after the hot working. 
 
     
     
         11 . The titanium alloy material according to  claim 2 , comprising Cu. 
     
     
         12 . The titanium alloy material according to  claim 2 , comprising Fe. 
     
     
         13 . The titanium alloy material according to  claim 2 , comprising Ni. 
     
     
         14 . The titanium alloy material according to  claim 2 , comprising Cu and Fe. 
     
     
         15 . The titanium alloy material according to  claim 2 , comprising Cu and Ni. 
     
     
         16 . The titanium alloy material according to  claim 2 , comprising Fe and Ni. 
     
     
         17 . The titanium alloy material according to  claim 2 , comprising Cu, Fe and Ni. 
     
     
         18 . The titanium alloy material according to  claim 2 , having an average crystal grain size of 10 μm or more. 
     
     
         19 . The titanium alloy material according to  claim 3 , having an average crystal grain size of 10 μm or more. 
     
     
         20 . The titanium alloy material according to  claim 11 , having an average crystal grain size of 10 μm or more.