The 21st century is called "the century of the ocean", and it is a century in which human beings are striding towards the ocean and developing and using the ocean. Marine engineering materials must have high strength, corrosion resistance, high toughness and other characteristics. Titanium is light, high strength, and corrosion resistant. It is a high-quality lightweight structural material. , Is one of the new key materials in the field of marine engineering.

Titanium alloy is an alloy composed of titanium element and other elements. It has the advantages of low density, high specific strength, good corrosion resistance, good heat resistance and low temperature resistance, non-magnetic, good impact resistance, and good welding performance. , Titanium alloy is used to make hull components, which greatly improves the performance of equipment.

The application of titanium alloys for stern ships is mainly concentrated in Russia, the United States, Japan, China and other countries. After decades of research and development, a marine titanium alloy system has been formed to meet the development needs and characteristics of the country.

No.1 Russia

Russia is the earliest country in the world to develop and use marine titanium alloys. It is also the country with the most widely used and largest number of marine titanium alloys. It has formed marine titanium alloy products with different strength levels such as 490, 585, 686, 785 MPa.

Russia built the first "ALFA" nuclear submarine in 1970. Six more ships were built in the 1970s and 1980s, each of which used about 3000t of titanium and had a maximum dive depth of 914m. It was light and fast, and had good maneuverability. A typical example of titanium used on ships is the Russian "Typhoon" class nuclear submarine. It has a titanium-made shell. For military needs, it uses a double-shell structure. Its double-layer shell shares titanium 9000t, making it non-magnetic and submersible. Deep, fast speed, low noise, less maintenance and so on.

Titanium alloys have also been successfully used in the following components and equipment on ships: deep-water risers, supply pipes, pumps, filters, sea-going pipelines, and successively in the former Soviet Union series of nuclear-powered icebreakers "Lenin" and "Arctic" "," Russia "," Soviet "and other types of ships. The titanium steam generators on the Soviet Soviet nuclear-powered icebreakers have been used safely for 20 to 40 years without any serious damage.

No.2 United States

3Mo-0. 8Ni titanium alloys for marine use in the United States are mainly based on titanium alloys for aviation, selected titanium alloys with corrosion resistance, weldability and stress corrosion resistance in seawater corrosion environment, including pure titanium, Ti-0. 3Mo-0. 8Ni , Ti-3Al-2. 5V, Ti-6Al-4V, Ti-6Al-4V ELI, Ti-3Al-8V-6Cr-4Mo-4Zr. In addition, in view of the characteristics of marine titanium alloys, other marine titanium alloys such as Ti-5Al-1Zr-1Sn-1V-0.8Mo-0.1Si have also been developed.

The use of high-performance titanium alloys on ships has a significant effect on improving the ship's mobility, stability, and effectiveness, and reducing the hull mass. In the 1990s, the US Navy conducted certification assessments of the following ships, including: nuclear-powered aircraft carriers (CVN), guided missile cruisers (CG-47), guided missile frigates (FFG-7), detection vessels (MCM), and amphibious landing craft (LSD41CV), landing ship, hovercraft (LVCA), amphibious assault landing ship (LHD), fast combat munitions supply ship (AOE-6), double shell surveillance ship (SWATH T-AGOS19), coast detection ship (MHC-51), guided missile destroyer (DDG-51). These ships' seawater cooling systems, seawater systems and fire suppression systems, structural parts, thrusters, sewage treatment systems, electrical components, fasteners, etc. have all used or will soon use high-performance titanium alloys.

No.3 Japan

钛 The shell framework, pressure equalization vessel, and piping of the series of deep-sea diving survey ships "Deep Ocean 2000" and "Deep Ocean 4000", which started in 1981, use titanium alloys.

Japan's marine titanium alloys are mainly pure titanium, Ti-6Al-4V, and Ti-6Al-4V ELI, which are mainly used in pressure-resistant shells of deep submersibles and various civilian pleasure boats and fishing boats.

No.4 China

The research and application of China's marine titanium alloy began in the 1960s. After decades of development, a more complete marine titanium alloy system has been formed, which can meet the requirements of different strength levels for ships, submarines and deep submersibles.

Application fields include hull structure, propulsion system, electric power system, electronic information system, auxiliary system, special device, etc. Divided by yield strength grade, that is, low strength titanium alloy with yield strength below 490 MPa, which has excellent plasticity; 490 ～ 790 MPa is medium strength titanium alloy, and higher than 790 MPa is high strength titanium alloy, mainly used in marine power engineering Heat-resistant and corrosion-resistant parts and ship special machinery.

If there is any infringement, please contact to delete it.

Previous: Where Are The Corrosion Resistance Applications Of Titanium And Titanium Alloys?

Next: Do You Know What The Three Brothers Of Titanium Alloys Are?