Coarse ring-free aluminum alloy bar and preparation method thereof

Abstract

The invention discloses a coarse ring-free aluminum alloy bar. The coarse ring-free aluminum alloy bar is prepared from the following components in percentage by weight: 0.62 to 0.7 percent of Si, 0.3 to 0.4 percent of Fe, 0.2 to 0.35 percent of Cu, 0.1 to 0.15 percent of Mn, 0.9 to 0.98 percent of Mg, 0.15 to 0.25 percent of Cr, 0.25 percent of Zn, 0.06 to 0.13 percent of Ti and the balance of Al. According to the coarse ring-free aluminum alloy bar disclosed by the invention, the addition range of Cr and Mn elements is strictly controlled on the basis of 6061 aluminum alloy specified in the national standard GB/T3191-2010, and the Cr and Mn elements have a function of inhibiting grain expansion in the aluminum alloy; the temperatures of a die, a cast ingot and an extrusion container can be controlled during a follow-up extrusion process, so that the shear deformation of a material during extrusion is reduced; an arc-shaped die bearing is adopted, so that the material flowing dead zone of an extrusion die is reduced; by using the produced 6061 aluminum alloy bar, a coarse ring cannot be fundamentally seen, the mechanical performance of a material and the oxidation performance of a product are greatly increased, the color of the material is consistent after an anode is oxidized, and the coarse ring-free aluminum alloy bar has no defects of piebaldness and the like.

Description

technical field [0001] The invention relates to a coarse-grain ring-free aluminum alloy rod and a preparation method thereof. Background technique [0002] The 6061 aluminum alloy in GB / T3191-2010 has good processing performance, medium strength, weldability, and high corrosion resistance. It is widely used in the manufacture of high-demand profiles and bars for aircraft, ships, and automobiles. . With the lightweight design of automobiles, the use of 6061 aluminum alloys in automobiles has increased. However, in the process of hot extrusion and quenching, coarse-grained rings are easily produced, which reduces the mechanical properties of the product, and reduces the strength and hardness. Spots appear on the surface of the profile, and the color difference is obvious, which affects the performance of the material. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art, and provide a coa...

AI Technical Summary

Problems solved by technology

With the lightweight design of automobiles, the use of 6061 aluminum alloys in automobiles has increased. However, in the process of hot extrusion and quenching, coarse-grained rings are easily produced, which red