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CN-122003302-A - Method for manufacturing thick aluminum plate and thick aluminum plate

CN122003302ACN 122003302 ACN122003302 ACN 122003302ACN-122003302-A

Abstract

A method for producing an aluminum thick plate, characterized by comprising a first pressing step of pressing an ingot of aluminum or an ingot of aluminum alloy in the Z direction by hot forging the ingot to reduce the Z-directional dimension of the ingot and thereby obtain a hot-forged product, and a second pressing step of pressing the hot-forged product in the Z direction by hot rolling the hot-forged product to reduce the Z-directional dimension of the hot-forged product and thereby obtain an aluminum thick plate. According to the present invention, it is possible to provide a method for producing a thick aluminum plate material, which can produce a thick aluminum or aluminum alloy plate material having a relatively large plate thickness and a relatively small internal void.

Inventors

  • Suzuki justice and
  • KUBO HIROSHI
  • TOYAMA Morito
  • KUBOTA KAZUTOSHI
  • SAKAGUCHI NOBUTO

Assignees

  • 株式会社UACJ

Dates

Publication Date
20260508
Application Date
20241119
Priority Date
20231121

Claims (10)

  1. 1. A method for producing an aluminum thick plate, characterized by comprising, when the longitudinal direction of an aluminum ingot or an aluminum alloy ingot is set as Z direction: A first pressing step of pressing the ingot in the Z direction by hot forging of the ingot to reduce the Z-direction dimension of the ingot to obtain a hot forged product, and And a second pressing step of pressing the hot forging in the Z direction by hot rolling the hot forging to reduce the Z-direction dimension of the hot forging, thereby obtaining an aluminum thick plate.
  2. 2. The method of producing an aluminum thick plate according to claim 1, wherein a total rolling reduction in the first rolling reduction step and the second rolling reduction step is 75.0% or more.
  3. 3. The method for producing an aluminum thick plate according to claim 1 or 2, wherein the first rolling reduction in the first rolling reduction step is 60.0% or more.
  4. 4. The method for producing an aluminum thick plate according to claim 1 or 2, wherein the second reduction rate in the second reduction step is 0.5% or more.
  5. 5. The method for producing an aluminum thick plate according to claim 1 or 2, wherein the thickness of the aluminum thick plate is 100mm or more.
  6. 6. The method for producing an aluminum thick plate according to claim 1 or 2, wherein the dimension of the ingot in the Z direction is 800mm or more.
  7. 7. The method for producing an aluminum thick plate according to claim 1 or 2, wherein, when the short side direction of the ingot is the X direction, The ratio of the dimension in the Z direction of the ingot to the dimension in the X direction of the ingot, i.e., the dimension in the Z direction/the dimension in the X direction, is 2.0 or more.
  8. 8. An aluminum thick plate is obtained by performing the following steps when the longitudinal direction of an aluminum ingot or an aluminum alloy ingot is the Z direction: A first pressing step of pressing the ingot in the Z direction by hot forging of the ingot to reduce the Z-direction dimension of the ingot to obtain a hot forged product, and And a second pressing step of pressing the hot forging in the Z direction by hot rolling the hot forging to reduce the Z-direction dimension of the hot forging, thereby obtaining an aluminum thick plate.
  9. 9. An aluminum thick plate material, characterized in that it comprises aluminum or an aluminum alloy containing 80 mass% or more of aluminum, The thickness of the sheet is more than 100mm, In microscopic observation of a cross section parallel to the plate thickness direction, the number density of internal voids having a Ferrett diameter of 50 μm or more in the center portion when the cross section is divided into three in the plate thickness direction is 0.15 pieces/mm 2 or less.
  10. 10. An aluminum thick plate, characterized in that it is composed of an Al-Mg alloy containing 1.50 mass% or more of Mg, The thickness of the sheet is more than 100mm, In microscopic observation of a cross section parallel to the plate thickness direction, the number density of internal voids having a Ferrett diameter of 50 μm or more in the center portion when the cross section is divided into three in the plate thickness direction is 0.15 pieces/mm 2 or less.

Description

Method for manufacturing thick aluminum plate and thick aluminum plate Technical Field The present invention relates to a thick plate of aluminum or aluminum alloy having a small internal void. Background Conventionally, thick plates of aluminum or aluminum alloy have been reused as processing blanks for vacuum chambers, semiconductor manufacturing apparatuses, and the like, and with the increase in the size of the apparatuses, extremely thick plates having a large plate thickness have been demanded. In the aluminum alloy thick plate for this purpose, it is necessary to reduce the internal voids in order to ensure airtightness, reduce the exhaust gas, and/or improve the uniformity of the surface treatment and improve the mechanical strength (particularly, fatigue strength). In particular, in a thick plate, the internal pores tend to be large or large, and this countermeasure is a technical problem. In addition, reduction of internal voids is a common problem in blanks for other fields requiring high reliability, such as high-speed railways, ships, aerospace, and the like. The thick plate of an aluminum alloy is usually manufactured by hot rolling using a substantially rectangular parallelepiped DC ingot (slab) as a raw material. At this stage of the slab, there is a certain degree of internal porosity. In particular, the internal pores tend to be large and large near the thick center of the slab. When a slab having a thickness of about 500mm is hot-rolled to a thickness of 100mm or less at a relatively high rolling reduction (80% or more) by conventional hot rolling, the voids caused by deformation of the material are pressure-bonded and eliminated to the vicinity of the center of the slab, and a state with few internal voids can be achieved. On the other hand, in the stage of hot rolling to a plate thickness of 200 to 400mm, for example, there is a problem that the size and/or number of pores in the interior become larger than those in the original slab. This is considered to be because, at a light/moderate pressure, deformation of the existing porosity is not sufficiently generated by pressure contact, but expansion and/or bonding of the porosity are promoted, and new porosity is generated at the interface between the grain boundaries and/or intermetallic compound particles. In particular, in cooperation with the difference in the deformed state in the vicinity of the center of the plate thickness, the voids existing from the state of the plate blank cannot be generally eliminated, and the size and/or the number thereof become large instead. Thus, it is known that if the reduction ratio of hot rolling is increased, the internal voids of the hot rolled sheet can be reduced. However, there are limits to the thickness of the industrial DC slab and/or the maximum material thickness entering the hot rolling mill, and thus, in particular in the case of thick slabs, there are limits to the reduction rate even for hot rolling to be increased. Therefore, the extremely thick plate is likely to have voids left therein. Accordingly, patent document 1 discloses a technique of suppressing the amount of hydrogen gas by degassing at the time of casting, mainly controlling the reduction ratio of 1 pass of hot rolling, and realizing reduction of the porosity of an aluminum thick plate. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2009-090372 Disclosure of Invention Problems to be solved by the invention However, in the method of patent document 1, the improvement effect is insufficient for the reduction of the void in the extremely thick plate. Accordingly, an object of the present invention is to provide a method for producing a thick aluminum plate material, which can produce a thick aluminum or aluminum alloy plate material having a relatively large plate thickness and having relatively small internal voids. Solution for solving the problem As a result of intensive studies, the present inventors have found that, when a thick plate of aluminum or an aluminum alloy having a relatively large plate thickness is produced, internal voids can be reduced in the thick plate having a relatively large plate thickness by forming the thick plate by a combined hot working of hot forging and hot rolling of an ingot, and have completed the present invention. That is, the present invention (1) provides a method for producing an aluminum thick plate, characterized by comprising, when the longitudinal direction of an aluminum ingot or an aluminum alloy ingot is the Z direction: A first pressing step of pressing the ingot in the Z direction by hot forging of the ingot to reduce the Z-direction dimension of the ingot to obtain a hot forged product, and And a second pressing step of pressing the hot forging in the Z direction by hot rolling the hot forging to reduce the Z-direction dimension of the hot forging, thereby obtaining an aluminum thick plate. The present invention (2) provides the method f