Chromium-molybdenum low-alloy prestress aluminum-cladding steel wire manufacturing method

Abstract

The present invention discloses a chromium-molybdenum low-alloy prestress aluminum-cladding steel wire manufacturing method, wherein the chromium-nickel-molybdenum alloy structure steel is adopted as a billet material and comprises, by mass, 0.28-0.38% of carbon, 0-0.35% of silicon, 0-0.90% of manganese, 0.80-1.50% of chromium, 3.00-4.00% of nickel, 0.40-0.60% of molybdenum, 0-0.015%of phosphorus, 0-0.015% of sulfur, 0-2.0 ppm of hydrogen, 0.10-0.20% of vanadium, 0-0.025% of titanium, 0-0.20% of copper, 0-0.05% of aluminum, 0-0.50% of residual elements, and the balance of Fe. According to the chromium-molybdenum low-alloy prestress aluminum-cladding steel wire manufacturing method designed by the present invention, strength and toughness of the steel wire can be substantially increased, a corrosion resistance degree of the steel wire can be enhanced, and a service life can be prolonged.

Description

technical field [0001] The invention relates to a method for manufacturing chromium-molybdenum low-alloy prestressed aluminum-clad steel wire. Background technique [0002] The prestressed steel wire belongs to the bimetal composite material, and is mainly used in the manufacture of bridge cables. In the prior art, the prestressed steel strand with a smooth surface is often used, which has the problems of serious corrosion and short service life. [0003] At the same time, the atomic activity of carbon and nitrogen elements in the steel raw material composition is low, and the air mass formed by each atom cannot form a strong interaction with the dislocation, and the dislocation can be activated without providing a large external stress, thus making the performance very unstable. , while the hydrogen content in the steel strand is above 2.0ppm, the steel strand is prone to cracks, thereby inducing hydrogen-induced cracks and hydrogen-induced delayed hysteresis cracks. [00...

AI Technical Summary

Problems solved by technology

[0002]Prestressed steel wire is a bimetallic composite material, mainly used in the manufacture of bridge cables. The problem of corrosion and short service life

[0003]At the same time, the atomic activity of carbon and nitrogen elements in the steel raw material composition is low, and the air mass formed by each atom cannot form a strong interaction with the dislocation, and there is no need to provide a relatively Large stress can start dislocation, so that the performance is very unstable. At the same time, the hydrogen content in the steel strand is above 2.0ppm, and the steel strand is prone to cracks, which induces hydrogen-induced cracks and hydrogen-induced delayed cracks.

[0004]In the prior art, only a single quenching method is generally used, which cannot prevent the quenching cracking and internal cracking of the forgings, and at the same time, the carbides cannot be further fully dissolved and cannot be uniformly quenched. Diffusion, so that the precipitation of carbides between grains cannot be avoided, resulting in excessive intergranular corrosion and pitting corrosion, which affects the technical effect of the heat treatment process after smelting.