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

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...

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