Control cooling method of resolving self-break while producing high-carbon wire rod

Abstract

The present invention relates to a control cooling method for preventing high-carbon rod from producing self-breakage in its production process. Said method includes a control cooling process, and is characterized by that according to the deficiency of water cooling control after the rod is rolled, a reasonable temperature control range can be defined, before finishing rolling mill a pre-water-cooling equipment is added, so that the finishing rolling temperature can be reduced, and the austenite grain size can be further refined. Besides, before water tank a temperature-measuring device is added, so that the temperature range can be accurately controlled.

Description

[0001] Field [0002] The invention belongs to the field of steel rolling and is mainly applicable to the controlled cooling technology of continuous casting high-carbon steel. Background technique [0003] The Stelmo controlled cooling line currently producing high-speed wire rods is shown in Figure 1. After passing through the finishing rolling unit, the steel is directly cooled by 1-2# water tanks, then air-cooled and returned to temperature, and then further cooled by 3# water tanks. Finally, it is cooled from the laying machine to the air cooling line. Because the cooling control line of the third and fourth generation of Morgan's rolling mills is short and the air volume of the fan is small, such as the high-speed wire rod factory of Shougang, the total length of the air-cooling control cooling section is 45 meters, and the air volume of the fan is 83000M 3 / h, in the production of high carbon steel, in order to make up for the lack of cooling capacity of the fan, it is...

AI Technical Summary

Problems solved by technology

If there are surface defects such as pits, folds, and cracks on the surface of the wire rod, the defects will be further aggravated in the process of rapid contraction first and then rapid expansion, and the lighter ones will cause the wire rod to break naturally during subsequent bundling or loading and unloading. , the severe one breaks during the silk spinning process; the water tank valves equipped with the Morgan 3 and 4 generation rolling mills are manually controlled, and the workers operate the water differently. In order to obtain the target silk spinning temperature, some workers have workers 1-2# when operating The valve of the water tank was opened too large, and some workers opened the valve of the 3# water tank too large, which caused the wire rod to cool rapidly in a certain section and increased the probability of natural fracture

[0004] When producing high-carbon 82B series wire rods, because the water cooling capacity of 1-2# and 3# water tanks cannot be well controlled, a certain section of water cooling is too severe, resulting in a large internal stress in the wire rod, and the surface shrinks sharply. In the subsequent temperature recovery process, the wire rod expands rapidly

If there are pits, folds, cracks and other surface defects on the surface of the wire rod, the defects will be further aggravated in the process of rapid shrinkage and rapid expansion, and the lighter ones will cause the wire rod to break naturally during subsequent bundling or loading and unloading. In severe cases, breakage occurs during spinning

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