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

A technology for controlling cooling and wire rod, applied in the field of steel rolling, can solve problems such as surface shrinkage, natural fracture of wire rod, increase natural fracture, etc., to achieve the effect of increasing surface shrinkage, solving natural fracture, and reducing internal stress

Active Publication Date: 2007-06-13
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Experimental program
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Embodiment Construction

[0015] At present, the rolling mill used by Shougang to produce 82B series wire rods is the third-generation Morgan rolling mill. The specific water cooling distribution after rolling is shown in Figure 1. Before December 2004, when producing large-size 82B wire rod, see Table 1 for water cooling control requirements after rolling.

[0016] When the workers control the water cooling after rolling, the control method of each worker is different, and the water cooling intensity of the 1, 2# and 3# water tanks cannot be reasonably allocated. The situation of the Φ12.5mm specification wire rod produced at that time is shown in Table 2 shown.

[0017] Table 1, process control without additional pre-water cooling and temperature measuring instrument

[0018]

control item

Rolling temperature

finish rolling temperature

Spend

Spinning temperature

Water cooling control

Control requirements

1020-1060

...

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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...

Claims

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Application Information

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IPC IPC(8): B21B37/74B21B45/02
Inventor 周德王全礼李永东陈明跃车金萍芦斌易敏张玮李飞刘玉新孙祥元章军
Owner SHOUGANG CORPORATION
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