A kind of manufacturing method of chromium-molybdenum low-alloy galvanized steel strand

Abstract

The present invention discloses a chromium-molybdenum low-alloy zinc-plating steel strand manufacturing method, wherein the chromium-nickel-molybdenum alloy structure steel 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 zinc-plating steel strand manufacturing method designed by the present invention, the prepared chromium-molybdenum low-alloy zinc-plating steel strand has characteristics of high strength, good hardenability good, cracking resistance, low relaxation degree, and smooth and uniform surface zinc plating.

Description

technical field [0001] The invention relates to a method for manufacturing a chromium-molybdenum low-alloy galvanized steel strand. Background technique [0002] In the prior art, 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, so that the performance Very unstable, and at the same time, the hydrogen content in the steel strand is above 2.0ppm, and the steel strand is prone to cracks, thereby inducing hydrogen-induced cracks and hydrogen-induced delayed hysteresis cracks. [0003] In the prior art, only a single quenching method is generally used, so that the quenching cracking and internal cracking of the forging cannot be prevented. At the same time, the carbides cannot be further fully dissolved and cannot be uniformly diffused, so that the precipitation...

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Problems solved by technology

[0002] In the prior art, 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, so that the performance Very unstable, and at the same time, the hydrogen content in the steel strand is above 2.0ppm, and the steel strand is prone to cracks, thereby inducing hydrogen-induced cracks and hydrogen-induced delayed hysteresis cracks

[0003]In the prior art, only a single quenching method is generally used, so that the quenching cracking and internal cracking of the forging cannot be prevented, and the carbides cannot be further fully dissolved, and the uniformity cannot be achieved. 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.

[0004] At the same time, in our conventional steel strand galvanizing process, improper selection of galvanizing solution, concentration, PH value and electroplating current will cause poor electroplating effect , and the activity in the electroplating solution is poor, which will not only cause uneven galvanizing, but also surface galvanizing defects, and the electroplating is not uniform and smooth.