Super-large-sized high-magnesium-content aluminum-alloy slab ingot and preparation method thereof

A technology with super-large size and manufacturing method, applied in the field of aluminum alloy processing, can solve the problems of coarse grains of ingot structure, easy cracking, easy generation of loose defects, etc., to achieve uniform microstructure of alloy, eliminate casting stress, and ingot mechanical properties. good effect

Inactive Publication Date: 2015-04-01
广西南南铝加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problems of easy cracking when casting large-scale high-magnesium 5XXX aluminum-magnesium-aluminum alloy flat ingots, coarse grains in the ingot structure, serious surface segregati

Method used

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  • Super-large-sized high-magnesium-content aluminum-alloy slab ingot and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, a super-sized 5XXX series aluminum alloy flat ingot is composed of Si<0.25%, Fe<0.30%, Cu<0.10%, Mn=0.60%~1.0%, Mg=4.45%~4.85%, by mass percentage, Cr=0.05%~0.22%, Zn<0.25%, Ti=0.005%~0.10%, Be=0.0002%~0.0015%, B<0.005%, Na<0.0003%, the rest is made of Al and other unavoidable impurities (Each impurity<0.05%, the total amount of other impurities<0.15%).

[0037] The present embodiment carries out according to the following steps:

[0038] 1. By mass percentage Si<0.25%, Fe<0.30%, Cu<0.10%, Mn=0.60%~1.0%, Mg=4.45%~4.85%, Cr=0.05%~0.22%, Zn<0.25%, Ti =0.005%~0.10%, Be=0.0002%~0.0015%, B<0.005%, Na<0.0003%, and the rest is Al, respectively weighing aluminum ingots for remelting, aluminum-manganese intermediate alloys, pure magnesium ingots, and aluminum-chromium intermediates alloy, aluminum-titanium master alloy, aluminum-beryllium master alloy, etc., and then add aluminum ingots for remelting, aluminum-manganese master alloys, pure magnesium ingots,...

Embodiment 2

[0046] In this embodiment, a super-sized 5XXX series aluminum alloy flat ingot consists of Si<0.12%, Fe<0.20%, Cu<0.15%, Mn=0.30%~0.45%, Mg=4.0%~4.5%, by mass percentage, Cr<0.08%, Zn<0.20%, Ti=0.002%~0.008%, Be=0.0002%~0.0008%, B<0.005%, Na<0.0003%, the rest is made of Al and other unavoidable impurities (each Impurities <0.05%, other impurities total <0.15%).

specific Embodiment 1

[0047] This embodiment is carried out according to the following steps (except steps 1 and 5, all the other steps are the same as in specific embodiment 1):

[0048] 1. By mass percentage Si<0.12%, Fe<0.20%, Cu<0.15%, Mn=0.30%~0.45%, Mg=4.0%~4.5%, Cr<0.08%, Zn<0.20%, Ti=0.002% ~0.008%, Be=0.0002%~0.0008%, B<0.005%, Na<0.0003%, and the rest is Al. Weigh aluminum ingot for remelting, aluminum-manganese master alloy, pure magnesium ingot, aluminum-chromium master alloy, aluminum-titanium Master alloys, aluminum-beryllium master alloys, etc., and then add aluminum ingots for remelting, aluminum-manganese master alloys, pure magnesium ingots, and aluminum-chromium master alloys into a dry melting furnace for smelting into molten aluminum. Turn on the electromagnetic stirrer for full stirring during the smelting process.

[0049] 5. Use the DC semi-continuous casting method to cast super-sized 5XXX series aluminum alloy flat ingots of 650mm thick x 2670mm wide x 8000mm long. Liqui...

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Abstract

The invention provides a super-large-sized high-magnesium-content aluminum-alloy slab ingot of which the maximum thickness reaches 1,000mm, the maximum width reaches 2,670mm and the maximum length reaches 8,000mm, and a preparation method thereof. The slab ingot is prepared from the following ingredients in percentage by mass: lower than 0.35% of Si, lower than 0.35% of Fe, lower than 0.15% of Cu, 0.20-1.0% of Mn, 4.0-6.5% of Mg, lower than 0.25% of Cr, lower than 0.25% of Zn, lower than 0.15% of Ti, lower than 0.005% of B, Al and the like. According to the method provided by the invention, the casting stress of the slab ingot is eliminated, the microscopic structure of alloy is uniform, the crystal grain is fine, the cast ingot is flawless, and the mechanical properties of the cast ingot are good. After the large-sized slab ingot is subjected to homogenizing treatment, the slab ingot is divided into thick plates or ingot bars with the thickness of 10-1,000mm through machining, is applied to rolling, mold manufacturing and other machined parts and is extensively applied to the fields of tools/dies, traffic, transportation, aeronautics/astronautics, shipbuilding, vehicles and the like.

Description

technical field [0001] The invention relates to an aluminum alloy processing method, in particular to an ultra-large aluminum alloy flat ingot with high magnesium content and a manufacturing method thereof. Background technique [0002] High magnesium content 5XXX series aluminum-magnesium alloys have the characteristics of low density and high specific strength, and are widely used in aerospace, transportation, mold manufacturing and other civil fields. In the industrial field, there is a relatively large demand for large-scale high-magnesium content 5XXX series aluminum alloy flat ingots, but casting large-scale high-magnesium content 5XXX series aluminum alloy flat ingots is very difficult, prone to various casting defects and poor ingot quality ,This is because: [0003] 1. With the increase of magnesium content, its crystallization interval increases, and a large casting stress is generated during the casting process, which easily leads to cracking of the ingot. [0...

Claims

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Application Information

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IPC IPC(8): C22C21/06C22C21/08C22C1/03C22C1/06C22F1/047B22D11/00
CPCC22C21/08C22C1/026C22C1/03C22C1/06C22F1/047
Inventor 沈海鸥郑玉林袁冰梅
Owner 广西南南铝加工有限公司
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