The liquefaction temperature of natural gas is -162℃, and the volume of liquefied natural gas (LNG for short) is 1/600 of the gaseous state, which makes the material requirements for LNG storage tanks higher. Generally speaking, the outer tank wall is pre-stressed reinforced concrete, and the inner tank wall is required to be resistant to low temperature, and materials such as 9Ni steel or aluminum alloy are generally used. Among them, most of the LNG storage tanks with aluminum alloy for the 5 series 5083 aluminum plate, 5083 aluminum plate can "take on this big task", mainly because of the following characteristics:
5083 aluminum plate belongs to the AL-Mg alloy, low density, high strength, fatigue performance and welding performance, good resistance to marine atmospheric corrosion. Tensile strength between 290-345Mpa, yield strength between 145-283Mpa. 5083 aluminum plate is used for the need for high corrosion resistance, good weldability and medium strength occasions, such as ships, automobiles, can also be used for the need for strict fire protection pressure vessels, refrigeration units, TV towers, drilling equipment, transportation equipment.
According to the National Development and Reform Commission (NDRC), China's natural gas consumption is on a growth trend, with a compound annual growth rate of about 15%. By the overall reserves of domestic natural gas and the constraints of the extraction capacity, the future gap in domestic demand for natural gas will be mainly through LNG imports to make up. It can be seen that the future demand for LNG storage tanks should not be underestimated, 5083 aluminum as the production of LNG storage tanks raw materials, "future" can be said to be unlimited.