9% Ni steel is W( Ni) -9% low carbon tool alloy satiated and tempered steel developed by the American International Nickel Company in 1944. Its structure is Martensite as well as Bainite. This steel has good toughness and high stamina at extremely low temperature level, the thermal expansion coefficient is tiny compared with Austenitic stainless steel as well as light weight aluminum alloy, the most affordable temperature can reach a 196 ℃. The 5% Ni steel developed based on 9Ni steel also has excellent reduced temperature durability at the low temperature of -162 ~ -196 ℃.

The primary features of this steel are high nickel material, high pureness, high toughness, high reduced temperature impact durability, good weldability. In 1952, the very first 9Ni steel tank on the planet was put into usage in the United States. In 1960, the study verified that 9Ni steel without post-weld stress and anxiety relief warmth treatment might be used securely. Since then, 9Ni steel has turned into one of the main products made use of in the manufacture of huge cryogenic storage tanks. The first LNG tank built in Japan in 1969 has a maximum capability of 20 × 104m ³.

The 9% Ni steel plate is the frequently used form for this steel, as well as the steel plate have some spec worldwide such as ASME: SA-353, EN 10028, JIS G3127, GB 24510 and others.

EN 10028-4: X8Ni9+ NT640/ X8Ni9+ QT680.

JIS G3127: SL9N520/SL9N590.

ASME: SA-353/ SA-553-1.

GB 24510: 9Ni490/ 9Ni590A.

The mechanical buildings of 9Ni steel at reduced temperature mostly rely on its chemical composition, specifically the contents of Ni as well as C. Furthermore, the strength of 9Ni steel likewise depends on the pureness as well as microstructure of the steel. The 8.50 ~ 9.50 Ni material made sure the hardenability to a particular degree. The reduction of carbon web content can significantly reduce the rainfall of carbides in solidified martensite, therefore improving the reduced temperature durability, while the high carbon content will cause major deterioration of welding residential or commercial properties as well as cold brittle residential properties. Consequently, in the alloying procedure, the content of C need to be purely managed to maintain it in the reduced carbon range, and also at the exact same time, the content of P, S, Mn, Mo, Cr and other alloying elements ought to likewise be regulated in the low range. The content of alloying elements and impurity is an important variable impacting the breakable shift temperature level of 9Ni steel.

We understand that the liquefaction temperature of gas is -162 ℃, as well as the volume of liquefied natural gas (LNG) is 1/600 of the gaseous state, which has greater needs on the product of LNG tank. Presently the materials used in LNG tank mainly Browse around this site are 9 Ni steel, 5 Ni, Austenitic stainless-steel, Aluminium magnesium alloy steel, etc., and also the most affordable temperature level can get to 9 Ni steel - 196 ℃, its high toughness, exceptional reduced temperature level toughness, great welding efficiency, very easy to processing advantages, making it widely used in the manufacture of LNG tank as well as transportation ships, is the very best of the cryogenic setting using the toughness of materials.