Aluminum profile for controlling coarse-grained ring and manufacturing method thereof

Abstract

The invention discloses an aluminum profile for controlling a coarse-grained ring and a manufacturing method thereof. The aluminum profile is prepared from the following elements in percentage by mass: 0.50-0.55% of Si, 0.15% of Fe, 0.01% of Cu, 0.15-0.25% of Mn, 0.54-0.62% of Mg, 0.14-0.2% of Cr, 0.01% of Zn, 0.02% of Ti, less than or equal to 0.15 part of the total content of other impurity elements, and the balance of Al, wherein the mass percentage of Mn+ Cr is 0.3-0.42%. According to the technical scheme, during casting of ingredients, it is better to control the content of Mn+ Cr in 0.32% to 0.34%, and the formation of the coarse-grained ring can be effectively prevented by controlling an ingot structure as a fine isometric crystal; in the extrusion type, a rapid coarse-grained extrusion process is adopted, rapid water-cooling is conducted, the extrusion ratio is controlled between 10 and 20, and the formation of the coarse-grained ring can be reduced; and in the quenching process, the bar diameter is controlled to 520 DEG C / 30-120 min, the coarse-grained ring cannot be deepened, and grains cannot grow coarse.

Description

technical field [0001] The invention relates to the field of aluminum alloy processing, in particular to an aluminum profile for controlling coarse crystal rings and a manufacturing method thereof. Background technique [0002] With the rapid development of the national economy, the aluminum processing industry plays an increasingly important role in the national economy. The application of aluminum and aluminum processed products is becoming more and more extensive. Aluminum extrusion profiles are not only widely used in the construction industry, but also penetrate into the industrial field. Aerospace, ships, weapons and other defense industries have been widely used. At the same time, the quality requirements for aluminum processing products are getting higher and higher. [0003] Some aluminum alloy extruded products form a coarse recrystallized grain structure area along the periphery of the product on the low-magnification test piece after solution treatment, which i...

AI Technical Summary

Problems solved by technology

[0005] 1. Uneven extrusion deformation;

[0006] 2. The heat treatment temperature is too high and the holding time is too long, which makes the grain grow;

[0007] 3. The chemical composition of the alloy is unreasonable;