Design of high-manganese medium-thickness plate applied to LNG (Liquefied Natural Gas) storage tanks and production method thereof

A technology of high manganese and storage tanks, applied in the field of steel materials, can solve the problems of reducing ultra-low temperature impact energy absorption, weakening grain boundary strength, cracking, etc., and achieve excellent resistance to temperature difference deformation performance, fatigue cracking resistance, and excellent plasticity.

Active Publication Date: 2017-09-19
NORTHEASTERN UNIV
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Problems solved by technology

Although there is no obvious ductile-brittle transition phenomenon in high-Mn austenitic steel, the Mn segregation and carbide precipitation at the grain boundary g

Method used

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  • Design of high-manganese medium-thickness plate applied to LNG (Liquefied Natural Gas) storage tanks and production method thereof
  • Design of high-manganese medium-thickness plate applied to LNG (Liquefied Natural Gas) storage tanks and production method thereof
  • Design of high-manganese medium-thickness plate applied to LNG (Liquefied Natural Gas) storage tanks and production method thereof

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Embodiment Construction

[0037] In the specific implementation process, the smelting is smelted in a vacuum induction furnace. After smelting, it is poured into a copper mold with a diameter of about 100 mm, and the shrinkage cavity is cut to obtain an ingot; the riser is cut off, and the ingot is heated to 1200 ° C for 2 hours. It is forged into a steel billet with a section of 80mm×80mm. The billets were reheated to 1200°C and held for 2 hours, and rolled in one or two stages on a 450mm two-roll reversing hot rolling experimental rolling mill. One-stage controlled rolling, the starting rolling temperature is 1083-1185°C, the final rolling temperature is 990-1116°C, and the starting and cooling temperature is 935-1080°C; two-stage controlled rolling, the first-stage rolling temperature is 1155-1170°C, The temperature of the first-stage finish rolling is 1090-1113°C, the second-stage start-rolling temperature is 931-962°C, the second-stage finish rolling temperature is 900-934°C, and the start-cooling...

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Abstract

The invention relates to design of a high-manganese medium-thickness plate applied to LNG (Liquefied Natural Gas) storage tanks and a production method thereof and belongs to the field of steel materials. The high-manganese medium-thickness plate comprises the following chemical components in percentage by weight: 0.45-0.67% of C, 0.02-0.48% of Si, 23.70-27.20% of Mn, less than or equal to 0.051% of P, less than or equal to 0.02% of S, 0.00-2.20% of Ni, 0.00-4.13% of Cr, 0.00-1.10% of Cu, 0.00-0.94% of Mo, 0.00-0.21% of V, 0.00-4.64% of Al and the balance of Fe and inevitable impurities. The production method of the high-manganese medium-thickness plate comprises the steps of smelting, pouring, forging and rolling. The product obtains a single-phase austenite structure; the experiment steel has high plasticity, simultaneously obtains excellent impact toughness at ultralow temperature of 196 DEG C below zero and has potential for replacing 9% Ni steel; and the cost of the experiment steel is far lower than that of the 9% Ni steel.

Description

technical field [0001] The invention relates to a design and a manufacturing method of a high manganese plate for an LNG storage tank, and belongs to the field of iron and steel materials. Background technique [0002] In recent years, LNG (liquefied natural gas, Liquefied Natural Gas), as a high-quality and efficient clean energy, has received more and more attention at home and abroad, and has already met the conditions for marketization. As the cleanest non-renewable energy recognized by the world, the production of LNG in my country is like a prairie fire, and it is rapidly entering the "golden age" of large-scale and industrialization. At present, there are 12 countries (about 68 production lines) producing LNG in the world, with a production capacity of 138 million tons per year. LNG products have been widely used in power generation, chemical raw materials, new vehicle fuels, civil fuels and other fields. [0003] It is estimated that natural gas will account for 25%...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/08C22C38/16C22C38/12C22C38/06C22C38/58C22C38/42C22C38/44C22C38/46C21D8/02
CPCC21D8/0226C21D2211/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/42C22C38/44C22C38/46C22C38/58
Inventor 刘振宇陈俊王国栋
Owner NORTHEASTERN UNIV
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