Preparation method of Al-Zn-Mg large-sized flat cast ingot

A slab and large-size technology, which is applied in the field of Al-Zn-Mg large-size slab preparation, can solve the problems of uneven composition and easy cracking of large-size slabs

Active Publication Date: 2019-07-02
广西南南铝加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention discloses a method for preparing Al-Zn-Mg large-size flat cast ingots, which can

Method used

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  • Preparation method of Al-Zn-Mg large-sized flat cast ingot
  • Preparation method of Al-Zn-Mg large-sized flat cast ingot
  • Preparation method of Al-Zn-Mg large-sized flat cast ingot

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Experimental program
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Effect test

Embodiment 1

[0026] The production process steps of large-size aluminum alloy slabs with a casting size of 650mm×2670mm×6000mm are as follows:

[0027] S1. Ingredients: According to the composition: Si<0.25%, Fe<0.40%, Cu<0.25%, Mn<0.10%, Mg=1.0~1.8%, Cr<0.05%, Zn=5.3~6.0%, Zr=0.11~ 0.18%, the balance is Al and unavoidable impurity elements for batching, respectively weighing aluminum ingots, pure magnesium ingots, pure zinc ingots, aluminum-titanium master alloys, and aluminum-zirconium master alloys for remelting as raw materials;

[0028] S2. Melting: Put the weighed raw materials into a dry smelting furnace for smelting. Melting temperature: 760℃, smelting time: 5~8h. During the smelting process, turn on the electromagnetic stirrer to fully stir, sample and analyze the chemical composition to see if it meets the requirements. Composition control requirements, if necessary, make composition adjustments, and transfer to the holding furnace when the composition is qualified.

[0029] S3. Insula...

Embodiment 2

[0039] The production process steps of large-size aluminum alloy slabs with a casting size of 550mm×2520mm×6000mm are as follows:

[0040] S1. Ingredients: According to the composition: Si<0.25%, Fe<0.40%, Cu<0.25%, Mn<0.10%, Mg=1.0~1.8%, Cr<0.05%, Zn=5.3~6.0%, Zr=0.11~ 0.18%, the balance is Al and unavoidable impurity elements for batching. The implementation of this case adopts the method of adding all the first-level return materials, without adding remelted aluminum ingots, and adding a small amount of master alloy according to the composition adjustment;

[0041] S2. Melting: Put the weighed raw materials into a dry smelting furnace for smelting. Melting temperature: 755℃, smelting time: 6~8h. During the smelting process, turn on the electromagnetic stirrer to fully stir, sample and analyze the chemical composition to see if it meets the requirements. Composition control requirements, if necessary, make composition adjustments, and transfer to the holding furnace when the comp...

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Abstract

The invention relates to a preparation method of an Al-Zn-Mg large-sized flat cast ingot. The preparation method includes the following steps that preparing is conducted; smelting is conducted; heat preservation is conducted; degassing and filtering are conducted; on-line grain refinement is conducted; casting is conducted, specifically, a lower casting pipe is used for casting, a distribution bagis installed at the bottom of the lower casting pipe, and an aluminum melt can flow in a semi-closed cavity formed by a crystallizer and a dummy bar head in the crystallizer; and homogenization treatment is conducted. The preparation method of the Al-Zn-Mg large-sized flat cast ingot can effectively solve the problems of uneven composition and prone cracking of the large-sized flat cast ingot.

Description

Technical field [0001] The invention relates to the technical field of aluminum alloy ingot casting, in particular to a method for preparing an Al-Zn-Mg large-size flat ingot. Background technique [0002] Air cargo has become an indispensable part of modern logistics with its fast and flexible transportation characteristics and advantages. The Al-Zn-Mg series aluminum alloy is a medium-strength heat-treatable and strengthened aluminum alloy, which has the characteristics of good corrosion resistance and easy processing. Its products with different heat treatment conditions are the main materials used in aviation containers. The specifications of aluminum alloy sheets for air containers currently produced in China are generally small, and most of them are below 1500mm in width. With the rapid development of air cargo, the demand for aluminum alloy wide plates (width greater than 2300mm) for air containers is increasing. The use of large-size ingots to produce wide plates has obv...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/03C22F1/053
CPCC22C1/026C22C1/03C22C21/10C22F1/053
Inventor 蓝东华黄金宁陈仁桂
Owner 广西南南铝加工有限公司
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