A feasible method for reducing surface contamination of titanium screws and titanium workpieces

Russia is an international leader in the research and manufacturing technology of building titanium alloy nuclear submarines, and is also the first country to build pressure hulls with titanium alloys. During the peak period, the annual output of titanium alloy plates and pipes for submarines was as high as 10,000 tons, accounting for 1/3 to 1/2 of the annual output of titanium alloy processed materials. Titanium plates for submarine heat exchangers require good thermal conductivity. The shell material is required to have good toughness to resist the shock wave caused by the depth charge explosion. The titanium plate (thick plate) for the submarine shell is produced in St. Petersburg, and the ingot is provided by the Upper Salda Metallurgical Production Joint Company. In terms of the development level of the titanium industry and the scale of use of titanium plates and wires in the shipbuilding industry, Russia is far ahead of all other countries in the world. Because Russia is ahead of competitors such as the United States in the field of ship materials research, its scholars have called on the government to formulate a near-term shipbuilding plan to avoid losing the leading position and development potential it has achieved, and at the same time to ensure that the Russian Navy will continue to lead in the 21st century. In other countries.

Since the 1960s, there have been 4 generations of nuclear submarines developed by Russia. The world’s first K162 all-titanium nuclear submarine was launched in December 1968 and has been in operation for more than 30 years. It has been to various oceans and sea areas and has withstood different loads and loads. Environmental assessment, there has never been any accident. Russia built the first "ALFA" class nuclear submarine in 1970, and continued to build 6 ships from the 1970s to the 1980s. Each of them uses titanium rods, titanium wires, and titanium plates about 3000t. The maximum diving depth is 914m, which is light and fast. .

In the 1980s, six "Typhoon" class nuclear submarines with a capacity of 9000t of titanium rods, titanium wires and titanium plates were manufactured. The first "Typhoon" class nuclear submarine was built in 1980 and commissioned in 1984. Its underwater displacement With a speed of 33800t and an underwater speed of about 27 knots, the "Typhoon" class nuclear submarine is the world's largest submarine. It has a double hull structure. The non-pressure hull is made of high-strength and low-magnetic steel, and the pressure hull is made of titanium alloy. It can carry 20 strategic missiles. The launch of the sixth "Typhoon" submarine was at the end of 1989, and the "Typhoon" series of submarines will be decommissioned at the beginning of the 21st century.

The first submarine in the new series of "The God of the North Wind", which was commissioned in 2003, is the "Yuri Dolgoruky". It is a new fourth-generation submarine, and its combat performance should exceed the existing ones of the same level. All submarines. Its underwater displacement is greater than that of the "Detal" class (11740t), but less than the "Typhoon" class (33800t), and the construction cost requires several trillion rubles.

The "Ohio" missile submarine that the United States entered service in 1980 has an underwater speed of 20n mile/h (knots).
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