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Titanium alloy has broad application prospects in ocean engineering due to its superior perfor-mance.

In China, the titanium alloy used in ocean engineering has a relatively perfect system and has been applied partly. Because of many reasons, such as, insufficient application performance data of titanium alloy, incomplete construction rules of ocean engineering component, inadequate plant capacity for producing titanium alloy, small product specifications and high production cost , the marine titanium alloy used in ocean engineering has been limited.

With the emphasis on ocean construction, the acceleration of application of titanium alloy in ocean engineering and the reduc-tion of production cost of titanium alloy, the marine titanium will have broader development space in the future.

Ocean Engineering
Ocean Engineering
Ocean Engineering
Ocean Engineering
Ocean Engineering

Advantages of Titanium in Ocean Engineering Applications

Titanium, known as “Marine metal”, is light, high strength, non-magnetic and corrosion resistant, especially outstanding in seawater and atmospheric corrosion resistance, is an excellent lightweight structural material, especially suitable for light Marine engineering equipment.The popularization and application of titanium and titanium alloy in Marine engineering is of great significance to improve the operational capability, safety, reliability and technical and tactical level of Marine engineering equipment, and is one of the important strategic materials for building a powerful Marine country.

Compared with steel, stainless steel, copper, aluminum and other common materials, titanium material has the most prominent characteristics of low density, high specific strength and strong corrosion resistance. At the same time, it has excellent seawater erosion resistance, no magnetism, no cold brittleness, high sound transmission coefficient and excellent neutron irradiation attenuation performance.In terms of plastic forming, casting and welding, titanium metal materials can be processed and formed by conventional methods, just like other common metal materials.

Ocean Engineering Applications

1. Shipboard applications

Titanium alloys began to be used in the ship industry in the 1960s, about a decade after titanium was used in the aerospace industry. The United States, Russia, Japan and China are the first countries to study the application of titanium in the field of ships.

A. hull structural materials
B. Ship pumps, valves, pipes and other accessories
C. power drive device
D. heat exchanger, condenser, cooler, evaporator
E. acoustic equipment

2. Deep-sea submersible

As major projects, our country “863” program is developed by research institute of China shipbuilding industry corporation 702 7000 meters of submersible 8 meters high, 3.4 meters long, 3 metres wide, with a special titanium alloy materials, in the 7000 meters deep can bear the weight of 710 tons, using the current of the world’s most advanced high and new technology, to realize the integration of vehicle performance and requirements.

Titanium alloy manned spherical shell is the most special and important part of the deep submersible, which is located in the front of the deep submersible and can carry the pressure of 700 atmospheres, realizing the same life support system as the space shuttle.

3. The Condenser

UNESCO publications estimate that the world’s total Marine energy is 76.6 billion kW.Condensers are important large-scale equipment in coastal power stations and nuclear power stations, and the cooling medium is seawater. Traditional steel and copper alloy materials, but poor seawater corrosion resistance, short service life.In seawater, especially under the action of polluted seawater, the copper alloy condenser is prone to pitting corrosion, hole corrosion, stress corrosion and fatigue corrosion, leading to equipment leakage and causing significant economic losses.Practice at home and abroad has proved that titanium is the most suitable material for condenser in power station.The total installed capacity of power stations in the world is about 2×107MW, and there are more than 5,000 thermal power stations and hydropower stations, which use titanium condensers accounting for about 3% ~ 4%, and more than 380 nuclear power plants, which use titanium condensers accounting for about 30%.

Titanium condensers are widely used in power stations in Europe, the United States, Japan and other countries.China’s taizhou power plant, zhenhai power plant, qinshan nuclear power plant, daya bay nuclear power plant and so on have used all titanium condenser.Titanium condensers in binhai power station have many advantages: seawater can be used as cooling medium in situ;Good corrosion resistance, long life;High heat exchange efficiency and good economic benefit;High safety performance, reduce outage maintenance time, low production efficiency.

4. Nuclear Submarine

Russia is in the international leading position in the construction of titanium alloy nuclear submarine technology, and is also the first country to build pressure-resistant shell with titanium alloy.Since the 1960s, Russia has developed four generations of nuclear submarines. The world’s first K162 all-titanium nuclear submarine was launched in December 1968.Russia built its first ALFA class nuclear submarine in 1970, and built six more in the 1970s and 1980s, each using about 3000t titanium, with a maximum depth of 914m, which is light and fast with good maneuvers. A typical example of titanium used on ships is Russian typhoon-class nuclear submarine, which has a shell made of titanium metal. Due to military needs, it adopts a double-shell structure, and its double-shell shares titanium 9000t, which makes it magnetic free, deep diving, fast speed, low noise and few maintenance times.

By the us west south research institute (SouthwestResearchInstitute (SWRI)) made in manned deep-sea submarine shell is made by the ELITi – 64.The new submarine sphere has an inner diameter of 2.1 meters, a large working space that can accommodate three people and a maximum working depth of 6,500 meters in seawater.

5. Deep Sea Space Station

The deep-sea mobile space station will mainly be used for Marine scientific exploration, dubbed as the tiangong-1 in the ocean.Since the 1960s, the United States and the former Soviet union have improved their deep-sea space station systems.

In 2000, Russia announced the civilian construction of its deep-sea space station, which is aimed at drilling for oil in the arctic ocean. China put forward the concept of deep-sea space station in the 1990s, aiming at the peaceful development and utilization of Marine resources. The deep-sea space station test ship that has been built and the small deep-sea mobile workstation under construction are independently developed by China. The establishment of deep sea space station is inseparable from titanium and titanium alloy key materials support. In the national science and technology innovation plan of the 13th five-year plan, the “science and technology innovation 2030 major project” deep sea space station was once again proposed and clearly approved. The main construction material of the space station is titanium alloy. It is preliminarily estimated that the construction of a main station will consume more than 4,000 tons of wool.

6. Desalination

Desalination has become a major source of fresh water in water-scarce areas such as the Middle East. In seawater desalination method, reliability, application is the most highest multi-stage flash method, the method of the equipment is mainly composed of the water heating, heat recovery condenser, heat output condenser, ventilation coagulator and injection compressor parts, such as heat exchange area use a lot of the pipe, the original use of copper alloy tube, due to the copper alloy corrosion resistant, has now been replaced by titanium tube.

7. Offshore Drilling

Platform titanium alloy has high strength, low density, excellent corrosion resistance and good toughness, which makes it the best choice for offshore drilling system equipment such as risers, drill pipes and tapered stress joints.In more cases, the composite application of titanium and steel has a great contribution to the cost reduction and benefit improvement of offshore drilling system.

The use of titanium alloy components in offshore oil drilling systems has increased significantly over the past few years. Titanium allows drilling equipment to enter deeper water and Wells, including hotter and more corrosive environments.

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