Low-resistivity high-strength aluminum alloy conductive tube and manufacturing method thereof

Abstract

The invention discloses a low-resistivity high-strength aluminum alloy conductive tube. The low-resistivity high-strength aluminum alloy conductive tube comprises, by mass, 0.50% -0.55% of Si, 0.15% of Fe, 0.01% of Cu, 0.01% of Mn, 0.52%-0.58% of Mg, 0.01% of Cr, 0.01% of Zn, 0.02% of Ti, not greater than 0.05% of Zr, not greater than 0.05% of mixed rare earth Re, less than 0.01% of Pb, not greater than 0.05% of B, not greater than 0.05% of V and the balance Al, wherein the total content of Zr, Re, Pb, B and V is less than or equal to 0.15%; and when the total content of Mn, V, Cr and Ti is lower than 0.012%, the addition amount of B is 0; and when the total content of Mn, V, Cr and Ti exceeds 0.012%, the addition amount of B is 1.25-1.5 times the stoichiometric number of B needed by a boron compound formed by Mn, V, Cr, Ti and B. According to the low-resistivity high-strength aluminum alloy conductive tube, the content of magnesium and silicon is strictly controlled, the content of other impurity elements is reduced, and the conductivity and performance of the tube are improved through standard limitation of the subsequent extrusion, quenching, stretching, aging and other processes.

Description

technical field [0001] The invention relates to the field of aluminum alloy processing, in particular to an aluminum alloy conductive tube with low resistivity and high strength and a manufacturing method thereof. Background technique [0002] Aluminum has excellent electrical and thermal conductivity. Its electrical conductivity is second only to silver and copper, which is about 62% of the electrical conductivity of copper. The strength of aluminum is low, and aluminum alloy materials are usually used for conductive components with high conductivity and other performance requirements; Al-Si-Mg alloy is a hypoeutectic cast alloy that can be strengthened by heat treatment, with high strength and good air tightness , excellent casting performance and good mechanical properties, so it is currently developed and widely used in ultra-high voltage power transmission and transformation equipment in China, but the main problems in actual production are low conductivity and low stre...

AI Technical Summary

Problems solved by technology

[0002] Aluminum has excellent electrical and thermal conductivity. Its electrical conductivity is second only to silver and copper, which is about 62% of the electrical conductivity of copper. The strength of aluminum is low, and aluminum alloy materials are usually used for conductive components with high conductivity and other performance requirements; Al-Si-Mg alloy is a hypoeutectic cast alloy that can be strengthened by heat treatment, with high strength and good air tightness , excellent casting performance and good mechanical properties, so it is currently developed and widely used in ultra-high voltage power transmission and transformation equipment in China, but the main problems in actual production are low conductivity and low strength, often reaching less than design requirements