Aluminum alloy plate for liquefied gas storage tank and preparation method thereof

Abstract

The invention discloses an aluminum alloy plate for a liquefied gas storage tank and a preparation method thereof. The aluminum alloy plate contains chemical elements such as Si, Fe, Cu, Mn, Mg, Cr, Zn, Ti, the balance Al, and the like. In the preparation method, an independent soaking treatment process is adopted, and through a good soaking control process, the composition segregation of a cast ingot is effectively eliminated, the inner stress of the cast ingot is reduced, and the chemical compositions are uniform; the aluminum alloy plate for liquefied natural gas prepared through the invention is an O-state finished product with the tensile strength reaching to 310 to 320 MPa, the ductility being 25 to 30 percent, the yield strength being 170 to 190 MPa, and the hardness being HV80 to 90; the aluminum alloy plate is good in roller arc performance, easy to cut and weld, free of cracking, attractive in surface after treatment, and free of quality defects such as pores and included slags in the thick plate.

Description

technical field

[0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to an aluminum alloy plate for a liquefied gas storage tank and a preparation method thereof, and mainly relates to a special aluminum alloy plate for a liquefied natural gas storage tank and a preparation method of the aluminum alloy plate.

[0002] technical background

[0003] Natural gas is a combustible gas naturally extracted from gas fields, mainly composed of methane, which can be condensed into a liquid when cooled to -162°C under normal pressure. Natural gas liquefaction can greatly save storage and transportation space, and has a large calorific value and high performance. Therefore, as a clean, efficient, convenient and safe energy source, liquefied natural gas has become one of the high-quality energy sources that modern society can choose due to its high calorific value, low pollution, and convenient storage and transportation.

[0004] Liquefied na...

Examples

Embodiment 1

[0044] An aluminum alloy plate for a liquefied gas storage tank, the mass percentage of each chemical element in the aluminum alloy plate is as follows: Si is 0.15%, Fe is 0.35%, Cu≤0.05%, Mn is 0.4%, Mg is 5.1%, Cr≤0.05%, Zn≤0.10%, Ti is 0.02%, and the balance is Al.

Embodiment 2

[0046] An aluminum alloy plate for a liquefied gas storage tank, the mass percentage of each chemical element in the aluminum alloy plate is as follows: Si is 0.25%, Fe is 0.45%, Cu≤0.05%, Mn is 0.5%, Mg is 5.4%, Cr≤0.05%, Zn≤0.10%, Ti is 0.03%, and the balance is Al.

Embodiment 3

[0048] An aluminum alloy plate for a liquefied gas storage tank, the mass percentage of each chemical element in the aluminum alloy plate is as follows: Si is 0.20%, Fe is 0.40%, Cu≤0.05%, Mn is 0.45%, Mg is 5.3%, Cr≤0.05%, Zn≤0.10%, Ti is 0.02%, and the balance is Al.

technical field

[0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to an aluminum alloy plate for a liquefied gas storage tank and a preparation method thereof, and mainly relates to a special aluminum alloy plate for a liquefied natural gas storage tank and a preparation method of the aluminum alloy plate.

[0002] technical background

[0003] Natural gas is a combustible gas naturally extracted from gas fields, mainly composed of methane, which can be condensed into a liquid when cooled to -162°C under normal pressure. Natural gas liquefaction can greatly save storage and transportation space, and has a large calorific value and high performance. Therefore, as a clean, efficient, convenient and safe energy source, liquefied natural gas has become one of the high-quality energy sources that modern society can choose due to its high calorific value, low pollution, and convenient storage and transportation.

[0004] Liquefied na...

Examples

Embodiment 1

[0044] An aluminum alloy plate for a liquefied gas storage tank, the mass percentage of each chemical element in the aluminum alloy plate is as follows: Si is 0.15%, Fe is 0.35%, Cu≤0.05%, Mn is 0.4%, Mg is 5.1%, Cr≤0.05%, Zn≤0.10%, Ti is 0.02%, and the balance is Al.

Embodiment 2

[0046] An aluminum alloy plate for a liquefied gas storage tank, the mass percentage of each chemical element in the aluminum alloy plate is as follows: Si is 0.25%, Fe is 0.45%, Cu≤0.05%, Mn is 0.5%, Mg is 5.4%, Cr≤0.05%, Zn≤0.10%, Ti is 0.03%, and the balance is Al.

Embodiment 3

[0048] An aluminum alloy plate for a liquefied gas storage tank, the mass percentage of each chemical element in the aluminum alloy plate is as follows: Si is 0.20%, Fe is 0.40%, Cu≤0.05%, Mn is 0.45%, Mg is 5.3%, Cr≤0.05%, Zn≤0.10%, Ti is 0.02%, and the balance is Al.

Images