The Aluminium 5083 for LNG Ship
LNG ship is a special ship that transports LNG (Liquefied natural gas) from a liquefaction plant to a receiving station. The main component of liquefied natural gas is methane. In order to facilitate transportation, it is usually liquefied by freezing at a very low temperature (-165°C) under normal pressure.
The storage tank of LNG ship is a special structure independent of the hull. In the design of the ship, the main factors considered are materials that can adapt to low-temperature media. Generally, marine carbon steels are brittle at such low temperatures. For this reason, the cargo tanks of LNG ships can only be made of expensive nickel alloy steel or aluminum 5083.
The safety of LNG ships has always been the focus of the industry. In addition to high strength and high toughness to resist bending load and sloshing impact, the liquid-carrying cargo tank construction materials must have reliable low temperature resistance and thermal insulation performance, as well as good processing technology, formability and welding performance.
At present, the main low-temperature resistant materials for the LNG ship Invar steel, 9% Ni steel and 5083 aluminum alloy. Invar steel is an iron-nickel alloy with very small thermal expansion coefficient, low thermal conductivity, low strength and hardness, high plasticity and toughness, and can maintain a fixed size in a wide temperature range. It is very expensive and has extremely high requirements for the welding process.
The main structure of 9% Ni steel is ferrite, which can be used at -196°C. It is widely used in LNG storage tanks due to its high strength and low thermal expansion rate. LNG storage tanks are generally large, and it is impossible to conduct heat treatment after welding. Therefore, in order to maintain good low temperature toughness after welding, 70% Ni steel is used as the welding material.
Aluminum grade 5083 has low density, high specific strength, good plasticity, corrosion resistance and processability, and no low-temperature brittleness. It has become a widely used material for manufacturing low-temperature storage tanks. Welcome to leave message below to inquire aluminum 5083.
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