Method for adding bubbles in EDC water tank to produce lead-bath-free wire

Abstract

The invention relates to a method for adding bubbles in an EDC water tank to produce a lead-bath-free wire. The method comprises the steps that firstly, water cooling and spinning are conducted aftersteel blank rolling; secondly, a wire ring is subjected to temperature reset and then enters an EDC system to be subjected to phase change treatment; thirdly, a bubble generator is arranged in the EDCwater tank, hot water in the EDC water tank is in a steam-water mixing state, a steam film is broken through the bubbles at the cooling earlier stage, the earlier stage cooling speed is increased, the bubbles are used for isolating the wire from the hot water part in the cooling later period, and the cooling speed is reduced; and fourthly, the wire cooled through the EDC water tank can be directly drawn into a steel wire without lead bath. According to the method, the lead bath cooling effect can be reached or approached, and the wire drawability and steel wire performance are improved by improving the cooling condition and the wire structure performance; and the method can be adopted for replacing the lead bath, energy can be better saved, and the steel wire production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of wire rod production, in particular to a method for producing lead-free bath wire rods by adding air bubbles in an EDC water tank. Background technique [0002] The EDC method (easy drawing-conveyer process) refers to the online controlled cooling method in which the hot-rolled wire rod is first cooled by water and then continuously unrolled and immersed in a hot water tank for cooling, that is, the uncoiled hot water bath method. The EDC process is an online heat treatment method mainly for high-quality carbon steel and high-quality carbon low-alloy steel in the production process of wire rods. It replaces the traditional Stelmore air-cooling process. In hot water, complete tissue transformation. Compared with the traditional Stelmore process, the EDC process has the advantages of uniform structure and properties of the strip, less oxidation and decarburization, and high drawability, and is an ideal meth...

AI Technical Summary

Problems solved by technology

However, compared with the lead bath treatment, the EDC process still has the problem that the steam film is thicker in the film boiling stage in the early stage of cooling, resulting in a lower cooling rate, and the steam film is thinner or even disappears in the later stage of cooling, resulting in a faster cooling rate.

It reflects that there are more proeutectoids in the microstructure and properties of the wire rod, and the continuous transition of the pearlite sheet from relatively coarse to too fine affects the drawability of the wire rod and the mechanical properties of the steel wire

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