Duralumin conductor material with 63% IACS and preparation method thereof

Abstract

The invention relates to a duralumin conductor material with the 63% IACS and a preparation method thereof. According to the high-conductivity duralumin conductor material, an industrial pure aluminum ingot is molten, the ingredients such as Si, Fe and B are adjusted, and refining treatment is carried out to obtain molten aluminum with the required ingredients; then the molten aluminum is poured to form an ingot, then the aluminum ingot is subjected to hot rolling to form a rod, and the aluminum rod is subjected to iron separation treatment; according to the iron separation treatment process, heat preservation is carried out for 1 h to 3 h at the temperature of 300 DEG C to 350 DEG C; and finally, the aluminum rod obtained after iron separation treatment is drawn to form a wire, the total deformation of drawing is controlled to be larger than or equal to 90%, and the duralumin conductor material with the conductivity larger than or equal to 63% IACS and the tensile strength larger than or equal to 160 MPa is prepared. The existing state of Fe is a high-iron phase and an iron-rich phase. The duralumin conductor material is stable in performance and high in yield, and the requirement for raw materials is loosened, so that the duralumin conductor material is low in price. Due to the fact that the conductivity of the duralumin conductor material with the 63% IACS is high, the loss of a transmission line is reduced, and the duralumin conductor material with the 63% IACS is especially suitable for long-distance overhead transmission lines.

Description

technical field [0001] The invention belongs to the technical field of electrical materials, in particular to a 63% IACS duralumin conductor material and a preparation method thereof. Background technique [0002] In order to reduce the line loss on the overhead transmission line, the State Grid Corporation of China has introduced the steel core high conductivity aluminum stranded wire enterprise standard. In this standard, the high conductivity duralumin wire is divided into 4 grades, and the tensile strength of the duralumin wire is All should be ≥160MPa, and the minimum electrical conductivities are 61.5% IACS, 62% IACS, 62.5% IACS and 63% IACS respectively. In order to manufacture duralumin conductors with a conductivity ≥ 63% IACS, or to use industrially pure aluminum raw materials with higher purity, my country's cable companies reduce the content of Si, Fe impurity elements and Cr, Mn, V, Ti impurity elements, and add A certain amount of boron element. For example, t...

AI Technical Summary

Problems solved by technology

This is mainly because the impurity elements in the duralumin conductor, especially iron, have contradictory effects on the tensile strength and conductivity. The less the impurity element content, the higher the conductivity of the duralumin conductor, but the lower the tensile strength. , and vice versa

Invention patents CN99104364.2 and CN201210209108.2 obtain electrical conductivity by adding a certain amount of boron to 99.5% to 99.7% industrial pure aluminum and annealing or self-annealing the aluminum rod at 200 to 320°C or 250 to 300°C. For aluminum rods with a tensile strength of 62.9-63.6% IACS and a tensile strength of 98-110 MPa, even if the aluminum rod is drawn into a hard aluminum wire, it is difficult to obtain a hard aluminum conductor with a conductivity ≥ 63% IACS and a tensile strength ≥ 160 MPa Material

This is mainly because annealing or self-annealing at 200-320°C or 250-300°C on the aluminum rod only changes the crystal defects and microstructure of the hot-rolled aluminum rod, and does not change the existence state of the impurity element Fe.