Titanium-molybdenum-nickel alloys

Abstract

The invention discloses a titanium-molybdenum-nickel alloy. Compositions of the invention are that: nitrogen: less than or equal to 0.01 weight percent; carbon: less than or equal to 0.03 weight percent; hydrogen: less than or equal to 0.005 weight percent; ferrum: less than or equal to 0.08 weight percent; oxygen: less than or equal to 0.08 weight percent; molybdenum: more than or equal to 0.2 weight percent and less than or equal to 0.4 weight percent; nickel: more than or equal to 0.6 weight percent and less than or equal to 0.9 weight percent; elementary residue: less than or equal to 0.1 weight percent; gross residue: less than or equal to 0.4 weight percent; the residual composition in the alloy is titanium. The titanium-molybdenum-nickel alloy of the invention has the advantages of capability of producing an ultra-long high inside diameter-wall thickness ratio titanium alloy pipe with a length of 12 meters to 16 meters, and the titanium alloy pipe has good quality and high yield.

Description

technical field [0001] The invention relates to a titanium alloy, in particular to a titanium-molybdenum-nickel alloy made of super-length and high diameter-to-wall ratio. Background technique [0002] Since my country entered the 21st century, titanium production has entered a stage of rapid development. Before 2001, my country's titanium production was basically about 2,000 tons per year, but in the past five years, the output of sponge titanium and titanium materials has reached a new high; in 2005, the annual production capacity of sponge titanium in China reached 13,000 tons, and the actual output was 9,500 tons. And the production of titanium alloy ingots reached more than 16,000 tons, a year-on-year increase of 37.3%; processed materials were nearly 10,000 tons, a year-on-year increase of 17%. Despite the high-speed growth of titanium production, it is still unable to meet domestic demand and is imported in large quantities. In 2005, my country imported more than 1,7...

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Problems solved by technology

[0004] However, there are obvious deficiencies in the application of such titanium alloy pipes: 1) the price of imported pipes is high, and the investment cost is high; 2) it cannot meet the height requirements of nuclear power plants and other special industries for titanium and titanium alloy pipes: 3) Due to the high content of H, O, N and carbon elements, the brittleness of titanium and titanium alloys is increased and the plasticity is reduced. It makes the subsequent processing into titanium and titanium alloy pipes more difficult and the yield rate is low. Generally, the length of the pipe produced is ≤8 meters, and the ultra-long titanium alloy pipes of 12 meters to 16 meters cannot be produced. It needs to be welded and lengthened during use, which affects the performance of the product. Reliability has a big impact, and the yield of finished products is low (ie, low yield)

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